Ulcerative colitis

Ulcerative colitis (UC) is a long-term condition that results in inflammation and ulcers of the colon and rectum.[1][7] The primary symptoms of active disease are abdominal pain and diarrhea mixed with blood.[1] Weight loss, fever, and anemia may also occur.[1] Often, symptoms come on slowly and can range from mild to severe.[1] Symptoms typically occur intermittently with periods of no symptoms between flares.[1] Complications may include abnormal dilation of the colon (megacolon), inflammation of the eye, joints, or liver, and colon cancer.[1][3]

Ulcerative colitis
Endoscopic image of a colon affected by ulcerative colitis. The internal surface of the colon is blotchy and broken in places. Mild-moderate disease.
SpecialtyGastroenterology
SymptomsAbdominal pain, diarrhea mixed with blood, weight loss, fever, anemia,[1] dehydration, loss of appetite, fatigue, sores on the skin, urgency to defecate, inability to defecate despite urgency, rectal pain[2]
ComplicationsMegacolon, inflammation of the eye, joints, or liver, colon cancer[1][3]
Usual onset15–30 years or > 60 years[1]
DurationLong term[1]
CausesUnknown[1]
Diagnostic methodColonoscopy with tissue biopsies[1]
Differential diagnosisDysentery, Crohn's disease, ischemic colitis[4]
TreatmentDietary changes, medication, surgery[1]
MedicationSulfasalazine, mesalazine, steroids, immunosuppressants such as azathioprine, biological therapy[1]
Frequency2-299 per 100,000[5]
Deaths47,400 together with Crohn's (2015)[6]

The cause of UC is unknown.[1] Theories involve immune system dysfunction, genetics, changes in the normal gut bacteria, and environmental factors.[1][8] Rates tend to be higher in the developed world with some proposing this to be the result of less exposure to intestinal infections, or to a Western diet and lifestyle.[7][9] The removal of the appendix at an early age may be protective.[9] Diagnosis is typically by colonoscopy with tissue biopsies.[1] It is a type of inflammatory bowel disease (IBD) along with Crohn's disease and microscopic colitis.[1]

Dietary changes, such as maintaining a high-calorie diet or lactose-free diet, may improve symptoms.[1] Several medications are used to treat symptoms and bring about and maintain remission, including aminosalicylates such as mesalazine or sulfasalazine, steroids, immunosuppressants such as azathioprine, and biologic therapy.[1] Removal of the colon by surgery may be necessary if the disease is severe, does not respond to treatment, or if complications such as colon cancer develop.[1] Removal of the colon and rectum generally cures the condition.[1][9]

Together with Crohn's disease, about 11.2 million people were affected as of 2015.[10] Each year it newly occurs in 1 to 20 per 100,000 people, and 5 to 500 per 100,000 individuals are affected.[7][9] The disease is more common in North America and Europe than other regions.[9] Often it begins in people aged 15 to 30 years, or among those over 60.[1] Males and females appear to be affected in equal proportions.[7] It has also become more common since the 1950s.[7][9] Together, ulcerative colitis and Crohn's disease affect about a million people in the United States.[11] With appropriate treatment the risk of death appears the same as that of the general population.[3] The first description of ulcerative colitis occurred around the 1850s.[9]

Signs and symptoms
Signs and symptoms
Crohn's diseaseUlcerative colitis
DefecationOften porridge-like,[12]
sometimes steatorrhea		Often mucus-like
and with blood[12]
TenesmusLess common[12]More common[12]
FeverCommon[12]Indicates severe disease[12]
FistulaeCommon[13] Seldom
Weight lossOftenMore seldom

Gastrointestinal

People with ulcerative colitis usually present with diarrhea mixed with blood,[14] of gradual onset that persists for an extended period of time (weeks). Additional symptoms may include fecal incontinence, increased frequency of bowel movements, mucus discharge, and nocturnal defecations.[14] With proctitis (inflammation of the rectum), people with UC may experience urgency or rectal tenesmus, which is the urgent desire to evacuate the bowels but with the passage of little stool.[14] Tenesmus may be misinterpreted as constipation, due to the urge to defecate despite small volume of stool passage. Bloody diarrhea and abdominal pain may be more prominent features in severe disease.[14] The severity of abdominal pain with UC varies from mild discomfort to very painful bowel movements and abdominal cramping.[15] High frequency of bowel movements, weight loss, nausea, fatigue, and fever are also common during disease flares. Chronic bleeding from the GI tract, chronic inflammation, and iron deficiency often leads to anemia, which can affect quality of life.[16]

The clinical presentation of ulcerative colitis depends on the extent of the disease process.[17] Up to 15% of individuals may have severe disease upon initial onset of symptoms.[14] A substantial proportion (up to 45%) of people with a history of UC without any ongoing symptoms (clinical remission) have objective evidence of ongoing inflammation.[18] Ulcerative colitis is associated with a generalized inflammatory process that can affect many parts of the body. Sometimes, these associated extra-intestinal symptoms are the initial signs of the disease.[19]

Extent of involvement
Classification of colitis, often used in defining the extent of involvement of ulcerative colitis, with proctitis (blue), proctosigmoiditis (yellow), left sided colitis (orange) and pancolitis (red). All classes extend distally to the end of the rectum.
Gross pathology of normal colon (left) and severe ulcerative colitis (right), forming pseudopolyps (smaller than the cobblestoning typically seen in Crohn's disease), over a continuous area (rather than skip lesions of Crohn's disease), and with a relatively gradual transition from normal colon (while Crohn's is typically more abrupt).

In contrast to Crohn's disease, which can affect areas of the gastrointestinal tract outside of the colon, ulcerative colitis is usually confined to the colon. Inflammation in ulcerative colitis is usually continuous, typically involving the rectum, with involvement extending proximally (to sigmoid colon, ascending colon, etc.).[20] In contrast, inflammation with Crohn's disease is often patchy, with so-called "skip lesions."[21]

The disease is classified by the extent of involvement, depending on how far the disease extends:[15] proctitis (rectal inflammation), left sided colitis (inflammation extending to descending colon), and extensive colitis (inflammation proximal to the descending colon).[20] Proctosigmoiditis describes inflammation of the rectum and sigmoid colon. Pancolitis describes involvement of the entire colon, extending from the rectum to the cecum. While usually associated with Crohn's disease, ileitis (inflammation of the ileum) also occurs in UC. About 17% of individuals with UC have ileitis.[22] Ileitis more commonly occurs in the setting of pancolitis (occurring in 20% of cases of pancolitis),[14] and tends to correlate with the activity of colitis. This so-called "backwash ileitis" can occur in 10–20% of people with pancolitis and is believed to be of little clinical significance.[23]

Severity of disease

In addition to the extent of involvement, UC is also characterized by severity of disease.[20] Severity of disease is defined by symptoms, objective markers of inflammation (endoscopic findings, blood tests), disease course, and the impact of the disease on day-to-day life.[20] Mild disease correlates with fewer than four stools daily; in addition, mild urgency and rectal bleeding may occur intermittently.[20] Mild disease lacks systemic signs of toxicity, and exhibits normal levels of serum inflammatory markers (erythrocyte sedimentation rate and C-reactive protein).

Moderate to severe disease correlates with more than six stools daily, frequent bloody stools and urgency.[20] Moderate abdominal pain, low-grade fever, 38 to 39 °C (100 to 102 °F), and anemia may develop (75% of normal).[20] Toxicity is present, as demonstrated by fever, tachycardia, anemia or an elevated ESR or CRP.[20]

Fulminant disease correlates with more than 10 bowel movements daily, continuous bleeding, toxicity, abdominal tenderness and distension, blood transfusion requirement, and colonic dilation (expansion). People with fulminant UC may have inflammation extending beyond just the mucosal layer, causing impaired colonic motility and leading to toxic megacolon. If the serous membrane is involved, a colonic perforation may ensue.

Ulcerative colitis may improve and enter remission. Remission of disease is characterized by formed stools, the absence of bloody diarrhea, resolution of urgency, and normal levels of serum inflammatory markers.[20]

Extraintestinal manifestations and complications
Complications
Crohn's
disease		Ulcerative
colitis
Nutrient deficiencyHigher risk
Colon cancer riskSlightConsiderable
Prevalence of extraintestinal complications[24][25][26]
Iritis/uveitisFemales2.2%3.2%
Males1.3%0.9%
Primary sclerosing
cholangitis		Females0.3%1%
Males0.4%3%
Ankylosing
spondylitis		Females0.7%0.8%
Males2.7%1.5%
Pyoderma
gangrenosum		Females1.2%0.8%
Males1.3%0.7%
Erythema nodosumFemales1.9%2%
Males0.6%0.7%
Aphthous ulcers involving the tongue, lips, palate, and pharynx.
Pyoderma gangrenosum with large ulcerations affecting the back.

UC is characterized by immune dysregulation and systemic inflammation, which may result in symptoms and complications outside the colon. Commonly affected organs include: eyes, joints, skin, and liver.[27] The frequency of such extraintestinal manifestations has been reported as between 6 and 47%.[28][29]

UC may affect the mouth. About 8% of individuals with UC develop oral manifestations.[30] The two most common oral manifestations are aphthous stomatitis and angular cheilitis.[30] Aphthous stomatitis is characterized by ulcers in the mouth, which are benign, noncontagious and often recurrent. Angular chelitis is characterized by redness at the corners of the mouth, which may include painful sores or breaks in the skin.[30] Very rarely, benign pustules may occur in the mouth (pyostomatitis vegetans).[30]

UC may affect the eyes. Inflammation may occur in the interior portion of the eye, leading to uveitis and iritis.[31] Uveitis can cause blurred vision and eye pain, especially when exposed to light (photophobia). Untreated, uveitis can lead to permanent vision loss.[31] Inflammation may also involve the white part of the eye (sclera) or the overlying connective tissue (episclera), causing conditions called scleritis and episcleritis.[32] Uveitis and iritis are more commonly associated with ulcerative colitis,[33] whereas episcleritis is more commonly associated with Crohn's disease.[33]

UC may cause several joint manifestations, including a type of rheumatologic disease known as seronegative arthritis, which may affect few large joints (oligoarthritis), the vertebra (ankylosing spondylitis) or several small joints of the hands and feet (peripheral arthritis).[27] Often the insertion site where muscle attaches to bone (entheses) becomes inflamed (enthesitis). Inflammation may affect the sacroiliac joint (sacroiliitis).[19] The symptoms of arthritis include joint pain, swelling, and effusion, and often leads to significant morbidity.[19]

Ulcerative colitis may affect the skin. The most common type of skin manifestation, erythema nodosum, presents as raised, tender red nodules usually appearing on the shins.[33] Erythema nodosum is due to inflammation of the underlying subcutaneous tissue (panniculitis). A more severe skin manifestation, pyoderma gangrenosum, is characterized painful pustules or nodules that become ulcers which progressively grow. Whereas erythema nodosum tends correlate with the activity of the ulcerative colitis and often improves with treatment of the colonic inflammation, pyoderma gangrenosum may occur independently of UC disease activity.[27] In some cases, pyoderma gangrenosum may require injection with corticosteroids.[27]

Ulcerative colitis may affect the blood and endocrine system. UC increases the risk of blood clots;[34][35][36] painful swelling of the lower legs can be a sign of deep venous thrombosis, while difficulty breathing may be a result of pulmonary embolism (blood clots in the lungs). The risk of blood clots is about threefold higher in individuals with IBD.[35] The risk of venous thromboembolism is high in ulcerative colitis due to hypercoagulability from inflammation, especially with active or extensive disease.[34] Additional risk factors may include surgery, hospitalization, pregnancy, the use of corticosteroids and tofacitinib.[34] The immune system may attack the red blood cells, leading to autoimmune hemolytic anemia. In addition to autoimmune destruction, anemia may occur due to chronic blood loss from rectal bleeding and bone marrow suppression due to inflammation (anemia of chronic disease). Osteoporosis may occur related to systemic inflammation, which increases the risk of bone fractures.[19] Clubbing, a deformity of the ends of the fingers, may occur.[19] Amyloidosis may occur, especially with severe and poorly controlled disease, which usually presents with protein in the urine (proteinuria) and nephritic syndrome.[19]

Primary sclerosing cholangitis

Ulcerative colitis has a significant association with primary sclerosing cholangitis (PSC), a progressive inflammatory disorder of small and large bile ducts. Up to 70-90% of people with primary sclerosing cholangitis have ulcerative colitis.[33] As many as 5% of people with ulcerative colitis may progress to develop primary sclerosing cholangitis.[27][37] PSC is more common in men, and often onsets between 30 and 40 years of age.[27] In some cases, primary sclerosing cholangitis occurs several years before the bowel symptoms of ulcerative colitis develop.[33] PSC does not parallel the onset, extent, duration, or activity of the colonic inflammation in ulcerative colitis.[33] In addition, colectomy does not have an impact on the course of primary sclerosing cholangitis in individuals with UC.[33] PSC is associated with an increased risk of colorectal cancer and cholangiocarcinoma (bile duct cancer).[33][27] PSC is a progressive condition, and may result in cirrhosis of the liver.[27] No specific therapy has been proven to affect the long term course of PSC.[27]

Causes
Risk factors
Crohn's diseaseUlcerative colitis
SmokingHigher risk for smokersLower risk for smokers[20]
AgeUsual onset between
15 and 30 years[38]		Peak incidence between
15 and 25 years

Ulcerative colitis is an autoimmune disease characterized by T-cells infiltrating the colon.[39] No direct causes for UC are known, but factors such as genetics, environment, and an overactive immune system play a role.[1] UC is associated with comorbidities that produce symptoms in many areas of the body outside the digestive system.

Genetic factors

A genetic component to the cause of UC can be hypothesized based on aggregation of UC in families, variation of prevalence between different ethnicities, genetic markers and linkages.[40] In addition, the identical twin concordance rate is 10%, whereas the dizygotic twin concordance rate is only 3%.[40][41] Between 8 and 14% of people with ulcerative colitis have a family history of inflammatory bowel disease.[14] In addition, people with a first degree relative with UC have a four-fold increase in their risk of developing the disease.[14]

Twelve regions of the genome may be linked to UC, including, in the order of their discovery, chromosomes 16, 12, 6, 14, 5, 19, 1, and 3,[42] but none of these loci has been consistently shown to be at fault, suggesting that the disorder is influenced by multiple genes. For example, chromosome band 1p36 is one such region thought to be linked to inflammatory bowel disease.[43] Some of the putative regions encode transporter proteins such as OCTN1 and OCTN2. Other potential regions involve cell scaffolding proteins such as the MAGUK family. Human leukocyte antigen associations may even be at work. In fact, this linkage on chromosome 6 may be the most convincing and consistent of the genetic candidates.[42]

Multiple autoimmune disorders are associated with ulcerative colitis, including celiac disease,[44] psoriasis,[45] lupus erythematosus,[46] rheumatoid arthritis,[47] episcleritis, and scleritis.[31] Ulcerative colitis is also associated with acute intermittent porphyria.[48]

Environmental factors

Many hypotheses have been raised for environmental factors contributing to the pathogenesis of ulcerative colitis, including diet, breastfeeding and medications. Breastfeeding may have a protective effect in the development of ulcerative colitis.[49][50] One study of isotretinoin found a small increase in the rate of UC.[51]

As the colon is exposed to many dietary substances which may encourage inflammation, dietary factors have been hypothesized to play a role in the pathogenesis of both ulcerative colitis and Crohn's disease. However, current research does not show a link between diet and the development of ulcerative colitis. Few studies have investigated such an association; one study showed no association of refined sugar on the number of people affected of ulcerative colitis.[52] High intake of unsaturated fat and vitamin B6 may enhance the risk of developing ulcerative colitis.[53] Other identified dietary factors that may influence the development and/or relapse of the disease include meat protein and alcoholic beverages.[54][55] Specifically, sulfur has been investigated as being involved in the cause of ulcerative colitis, but this is controversial.[56] Sulfur restricted diets have been investigated in people with UC and animal models of the disease. The theory of sulfur as an etiological factor is related to the gut microbiota and mucosal sulfide detoxification in addition to the diet.[57][58][59]

As a result of a class-action lawsuit and community settlement with DuPont, three epidemiologists conducted studies on the population surrounding a chemical plant that was exposed to PFOA at levels greater than in the general population. The studies concluded that there was an association between PFOA exposure and six health outcomes, one of which being ulcerative colitis.[60]

Alternative theories

Levels of sulfate-reducing bacteria tend to be higher in persons with ulcerative colitis, which could indicate higher levels of hydrogen sulfide in the intestine. An alternative theory suggests that the symptoms of the disease may be caused by toxic effects of the hydrogen sulfide on the cells lining the intestine.[61]

Infection by mycobacterium avium, subspecies paratuberculosis, has been proposed as the ultimate cause of both ulcerative colitis and Crohn's disease.[62]

Pathophysiology
Pathophysiology
Crohn's diseaseUlcerative colitis
Cytokine responseAssociated with Th17[63]Vaguely associated with Th2

An increased amount of colonic sulfate-reducing bacteria has been observed in some people with ulcerative colitis, resulting in higher concentrations of the toxic gas hydrogen sulfide. Human colonic mucosa is maintained by the colonic epithelial barrier and immune cells in the lamina propria (see intestinal mucosal barrier). N-butyrate, a short-chain fatty acid, gets oxidized through the beta oxidation pathway into carbon dioxide and ketone bodies. It has been shown that N-butyrate helps supply nutrients to this epithelial barrier. Studies have proposed that hydrogen sulfide plays a role in impairing this beta-oxidation pathway by interrupting the short chain acetyl-CoA dehydrogenase, an enzyme within the pathway. Furthermore, it has been suggested that the protective benefit of smoking in ulcerative colitis is due to the hydrogen cyanide from cigarette smoke reacting with hydrogen sulfide to produce the non-toxic isothiocyanate, thereby inhibiting sulfides from interrupting the pathway.[64] An unrelated study suggested that the sulfur contained in red meats and alcohol may lead to an increased risk of relapse for people in remission.[61]

Diagnosis
Endoscopic image of ulcerative colitis affecting the left side of the colon. The image shows confluent superficial ulceration and loss of mucosal architecture. Crohn's disease may be similar in appearance, a fact that can make diagnosing UC a challenge.
H&E stain of a colonic biopsy showing a crypt abscess, a classic finding in ulcerative colitis

The initial diagnostic workup for ulcerative colitis consists of a complete history and physical examination, assessment of signs and symptoms, laboratory tests and endoscopy.[65] Specific testing may include the following:[20][66]

  • A complete blood count is done to check for anemia; thrombocytosis, a high platelet count, is occasionally seen
  • Electrolyte studies and kidney function tests are done, as chronic diarrhea may be associated with hypokalemia, hypomagnesemia and kidney injury.
  • Liver function tests are performed to screen for bile duct involvement: primary sclerosing cholangitis.
  • Imaging such as x-ray or CT scan to evaluate for possible perforation or toxic megacolon
  • Stool culture and Clostridioides difficile stool assay to rule out infectious colitis[65]
  • Inflammatory markers, such as erythrocyte sedimentation rate or C-reactive protein
  • Lower endoscopy to evaluate the rectum and distal large intestine (sigmoidoscopy) or entire colon and end of the small intestine (colonoscopy) for ulcers and inflammation

Although ulcerative colitis is a disease of unknown causation, inquiry should be made as to unusual factors believed to trigger the disease.[20]

The simple clinical colitis activity index was created in 1998 and is used to assess the severity of symptoms.[67][68]

Endoscopic
Colonic pseudopolyps of a person with intractable UC, colectomy specimen

The best test for diagnosis of ulcerative colitis remains endoscopy, which is examination of the internal surface of the bowel using a flexible camera. Initially, a flexible sigmoidoscopy may be completed to establish the diagnosis.[69] The physician may elect to limit the extent of the initial exam if severe colitis is encountered to minimize the risk of perforation of the colon. However, a complete colonoscopy with entry into the terminal ileum should be performed to rule out Crohn's disease, and assess extent and severity of disease.[69] Endoscopic findings in ulcerative colitis include: erythema (redness of the mucosa), friability of the mucosa, superficial ulceration, and loss of the vascular appearance of the colon. When present, ulcerations may be confluent. Pseudopolyps may be observed.[70]

Ulcerative colitis is usually continuous from the rectum, with the rectum almost universally being involved. Perianal disease is rare. The degree of involvement endoscopically ranges from proctitis (rectal inflammation) to left sided colitis (extending to descending colon), to extensive colitis (extending proximal to descending colon).[15]

Histologic
Biopsy sample (H&E stain) that demonstrates marked lymphocytic infiltration (blue/purple) of the intestinal mucosa and architectural distortion of the crypts.

Biopsies of the mucosa are taken during endoscopy to confirm the diagnosis of UC and differentiate it from Crohn's disease, which is managed differently clinically. Histologic findings in ulcerative colitis includes: distortion of crypt architecture, crypt abscesses, and inflammatory cells in the mucosa (lymphocytes, plasma cells, and granulocytes).[27] Unlike the transmural inflammation seen in Crohn's disease, the inflammation of ulcerative colitis is limited to the mucosa.[27]

Laboratory tests

Blood and stool tests serve primarily to assess disease severity, level of inflammation and rule out causes of infectious colitis. All individuals with suspected ulcerative colitis should have stool testing to rule out infection.[14]

A complete blood count may demonstrate anemia, leukocytosis, or thrombocytosis.[14] Anemia may be caused by inflammation or bleeding. Chronic blood loss may lead to iron deficiency as a cause for anemia, particularly microcytic anemia (small red blood cells), which can be evaluated with a serum ferritin, iron, total iron-binding capacity and transferrin saturation. Anemia may be due to a complication of treatment from azathioprine, which can cause low blood counts,[71] or sulfasalazine, which can result in folate deficiency. Thiopurine metabolites (from azathioprine) and a folate level can help.[72]

UC may cause high levels of inflammation throughout the body, which may be quantified with serum inflammatory markers, such as CRP and ESR. However, elevated inflammatory markers are not specific for UC and elevations are commonly seen in other conditions, including infection. In addition, inflammatory markers are not uniformly elevated in people with ulcerative colitis. Twenty five percent of individuals with confirmed inflammation on endoscopic evaluation have a normal CRP level.[20] Serum albumin may also be low related to inflammation, in addition to loss of protein in the GI tract associated with bleeding and colitis. Low serum levels of vitamin D are associated with UC, although the significance of this finding is unclear.[73]

Specific antibody markers may be elevated in ulcerative colitis. Specifically, perinuclear antineutrophil cytoplasmic antibodies (pANCA) are found in 70 percent of cases of UC.[20] Antibodies against Saccharomyces cerevisiae may be present, but are more often positive in Crohn's disease compared with ulcerative colitis. However, due to poor accuracy of these serolologic tests, they are not helpful in the diagnostic evaluation of possible inflammatory bowel disease.[20][27]

Several stool tests may help quantify the extent of inflammation present in the colon and rectum. Fecal calprotectin is elevated in inflammatory conditions affecting the colon, and is useful in distinguishing irritable bowel syndrome (noninflammatory) from a flare in inflammatory bowel disease.[20] Fecal calprotectin is 88% sensitive and 79% specific for the diagnosis of ulcerative colitis.[20] If the fecal calprotectin is low, the likelihood of inflammatory bowel disease are less than 1 percent.[14] Lactoferrin is an additional nonspecific marker of intestinal inflammation.[74]

Imaging

Imaging tests, such as x-ray or CT scan, may be helpful in assessing for complications of ulcerative colitis, such as perforation or toxic megacolon. Bowel ultrasound (US) is a cost-effective, well-tolerated, non-invasive and readily available tool for the management of patients with inflammatory bowel disease (IBD), including UC, in clinical practice.[75] Some recent studies demonstrated that US is an accurate tool for assessing disease activity in patients with UC.[76][77] Imaging is otherwise of limited use in diagnosing ulcerative colitis.[14][27] Magnetic resonance imaging (MRI) is necessary to diagnose underlying PSC.[27]

Differential diagnosis

Several conditions may present in a similar manner as ulcerative colitis, and should be excluded. Such conditions include: Crohn's disease, infectious colitis, nonsteroidal anti-inflammatory drug enteropathy, and irritable bowel syndrome. Alternative causes of colitis should be considered, such as ischemic colitis (inadequate blood flow to the colon), radiation colitis (if prior exposure to radiation therapy), or chemical colitis. Pseudomembranous colitis may occur due to Clostridioides difficile infection following administration of antibiotics. Entamoeba histolytica is a protozoan parasite that causes intestinal inflammation. A few cases have been misdiagnosed as UC with poor outcomes occurring due to the use of corticosteroids.[78]

The most common disease that mimics the symptoms of ulcerative colitis is Crohn's disease, as both are inflammatory bowel diseases that can affect the colon with similar symptoms. It is important to differentiate these diseases since their courses and treatments may differ. In some cases, however, it may not be possible to tell the difference, in which case the disease is classified as indeterminate colitis.[79]

Diagnostic findings
Crohn's diseaseUlcerative colitis
Terminal ileum involvementCommonlySeldom
Colon involvementUsuallyAlways
Rectum involvementSeldomUsually (95%)[20]
Involvement around
the anus		Common[80] Seldom
Bile duct involvementNo increase in rate of primary sclerosing cholangitisHigher rate[81]
Distribution of diseasePatchy areas of inflammation (skip lesions)Continuous area of inflammation[20]
EndoscopyDeep geographic and serpiginous (snake-like) ulcers Continuous ulcer
Depth of inflammationMay be transmural, deep into tissues[80][42] Shallow, mucosal
StenosisCommonSeldom
Granulomas on biopsyMay have non-necrotizing non-peri-intestinal crypt granulomas[80][82][83] Non-peri-intestinal crypt granulomas not seen[84]

Management

Standard treatment for ulcerative colitis depends on the extent of involvement and disease severity. The goal is to induce remission initially with medications, followed by the administration of maintenance medications to prevent a relapse. The concept of induction of remission and maintenance of remission is very important. The medications used to induce and maintain a remission somewhat overlap, but the treatments are different. Physicians first direct treatment to inducing remission, which involves relief of symptoms and mucosal healing of the colon's lining, and then longer-term treatment to maintain remission and prevent complications. Acute severe ulcerative colitis requires hospitalisation, exclusion of infections, and corticosteroids.[85]

For acute stages of the disease, a low fiber diet may be recommended.[86][87]

Medication

Ulcerative colitis can be treated with a number of medications, including 5-ASA drugs such as sulfasalazine and mesalazine. Corticosteroids such as prednisone can also be used due to their immunosuppressive and short-term healing properties, but because their risks outweigh their benefits, they are not used long-term in treatment. Immunosuppressive medications such as azathioprine and biological agents such as infliximab and adalimumab are given only if people cannot achieve remission with 5-ASA and corticosteroids. Infliximab, ustekinumab, or vedolizumab are recommended in those with moderate or severe disease.[88]

A formulation of budesonide was approved by the U.S. Food and Drug Administration (FDA) for treatment of active ulcerative colitis in January 2013.[89][90] In 2018, tofacitinib was approved for treatment of moderately to severely active ulcerative colitis in the United States, the first oral medication indicated for long term use in this condition.[91] The evidence on methotrexate does not show a benefit in producing remission in people with ulcerative colitis.[92] Cyclosporine is effective for severe UC[88] and tacrolimus has also shown benefits.[93][94][95][96]

Aminosalicylates

Sulfasalazine has been a major agent in the therapy of mild to moderate ulcerative colitis for over 50 years. In 1977, it was shown that 5-aminosalicylic acid (5-ASA, mesalazine/mesalamine) was the therapeutically active component in sulfasalazine.[97] Many 5-ASA drugs have been developed with the aim of delivering the active compound to the large intestine to maintain therapeutic efficacy but with reduction of the side effects associated with the sulfapyridine moiety in sulfasalazine. Oral 5-ASA drugs are particularly effective in inducing and in maintaining remission in mild to moderate ulcerative colitis.[98][99] Rectal suppository, foam or liquid enema formulations of 5-ASA are used for colitis affecting the rectum, sigmoid or descending colon, and have been shown to be effective especially when combined with oral treatment.[100]

Biologics

Biologic treatments such as the TNF inhibitors infliximab, adalimumab, and golimumab are commonly used to treat people with UC who are no longer responding to corticosteroids. Tofacitinib and vedolizumab can also produce good clinical remission and response rates in UC.[8] Biologics may be used early in treatment (step down approach), or after other treatments have failed to induce remission (step up approach); the strategy should be individualized.[101]

Unlike aminosalicylates, biologics can cause serious side effects such as an increased risk of developing extra-intestinal cancers,[102] heart failure; and weakening of the immune system, resulting in a decreased ability of the immune system to clear infections and reactivation of latent infections such as tuberculosis. For this reason, people on these treatments are closely monitored and are often tested for hepatitis and tuberculosis annually.[103][104]

Nicotine

Unlike Crohn's disease, ulcerative colitis has a lesser chance of affecting smokers than non-smokers.[105][106] In select individuals with a history of previous tobacco use, resuming low dose smoking may improve signs and symptoms of active ulcerative colitis,[107] but it is not recommended due to the overwhelmingly negative health effects of tobacco.[108] Studies using a transdermal nicotine patch have shown clinical and histological improvement.[109] In one double-blind, placebo-controlled study conducted in the United Kingdom, 48.6% of people with UC who used the nicotine patch, in conjunction with their standard treatment, showed complete resolution of symptoms. Another randomized, double-blind, placebo-controlled, single-center clinical trial conducted in the United States showed that 39% of people who used the patch showed significant improvement, versus 9% of those given a placebo.[110] However, nicotine therapy is generally not recommended due to side effects and inconsistent results.[111][112][113]

Iron supplementation

The gradual loss of blood from the gastrointestinal tract, as well as chronic inflammation, often leads to anemia, and professional guidelines suggest routinely monitoring for anemia with blood tests repeated every three months in active disease and annually in quiescent disease.[114] Adequate disease control usually improves anemia of chronic disease, but iron deficiency anemia should be treated with iron supplements. The form in which treatment is administered depends both on the severity of the anemia and on the guidelines that are followed. Some advise that parenteral iron be used first because people respond to it more quickly, it is associated with fewer gastrointestinal side effects, and it is not associated with compliance issues.[115] Others require oral iron to be used first, as people eventually respond and many will tolerate the side effects.[114][116]

Surgery
Management
Crohn's diseaseUlcerative colitis
MesalazineLess useful[117]More useful[117]
AntibioticsEffective in long-term[118]Generally not useful[119]
SurgeryOften returns following
removal of affected part		Usually cured by removal
of colon

Unlike in Crohn's disease, the gastrointestinal aspects of ulcerative colitis can generally be cured by surgical removal of the large intestine, though extraintestinal symptoms may persist. This procedure is necessary in the event of: exsanguinating hemorrhage, frank perforation, or documented or strongly suspected carcinoma. Surgery is also indicated for people with severe colitis or toxic megacolon. People with symptoms that are disabling and do not respond to drugs may wish to consider whether surgery would improve the quality of life.[15]

The removal of the entire large intestine, known as a proctocolectomy, results in a permanent ileostomy – where a stoma is created by pulling the terminal ileum through the abdomen. Intestinal contents are emptied into a removable ostomy bag which is secured around the stoma using adhesive.[120]

Another surgical option for ulcerative colitis that is affecting most of the large bowel is called the ileal pouch-anal anastomosis (IPAA). This is a two- or three-step procedure. In a three-step procedure, the first surgery is a sub-total colectomy, in which the large bowel is removed, but the rectum remains in situ, and a temporary ileostomy is made. The second step is a proctectomy and formation of the ileal pouch (commonly known as a "j-pouch"). This involves removing the large majority of the remaining rectal stump and creating a new "rectum" by fashioning the end of the small intestine into a pouch and attaching it to the anus. After this procedure, a new type of ileostomy is created (known as a loop ileostomy) to allow the anastomoses to heal. The final surgery is a take-down procedure where the ileostomy is reversed and there is no longer the need for an ostomy bag. When done in two steps, a proctocolectomy – removing both the colon and rectum – is performed alongside the pouch formation and loop ileostomy. The final step is the same take-down surgery as in the three-step procedure. Time taken between each step can vary, but typically a six- to twelve-month interval is recommended between the first two steps, and a minimum of two to three months is required between the formation of the pouch and the ileostomy take-down.[15]

While the ileal pouch procedure removes the need for an ostomy bag, it does not restore normal bowel function. In the months following the final operation, patients typically experience 8–15 bowel movements a day. Over time this number decreases, with many patients reporting four-six bowel movements after one year post-op. While many patients have success with this procedure, there are a number of known complications. Pouchitis, inflammation of the ileal pouch resulting in symptoms similar to ulcerative colitis, is relatively common. Pouchitis can be acute, remitting, or chronic however treatment using antibiotics, steroids, or biologics can be highly effective. Other complications include fistulas, abscesses, and pouch failure. Depending on the severity of the condition, pouch revision surgery may need to be performed. In some cased the pouch may need to be de-functioned or removed and an ileostomy recreated.[121][122]

The risk of cancer arising from a ileal pouch anal anastomosis is low.[123] However, annual surveillance with pouchoscopy may be considered in individuals with risk factors for dysplasia, such as a history of dysplasia or colorectal cancer, a history of PSC, refractory pouchitis, and severely inflamed atrophic pouch mucosa.[123]

Bacterial recolonization

In a number of randomized clinical trials, probiotics have demonstrated the potential to be helpful in the treatment of ulcerative colitis. Specific types of probiotics such as Escherichia coli Nissle have been shown to induce remission in some people for up to a year.[124] A probiotic named after its gastroenterologist medical doctor inventor, the De Simone Formulation, may be effective in inducing remission in active ulcerative colitis, and may be as effective as 5-ASAs in preventing relapse of quiescent UC.[125] The De Simone Formulation was sold and researched under the brand name VSL#3 until 2016. Since, it has been sold and researched under various regional brand names including Visbiome in the United States and Vivomixx in Europe.[126][127][128][129]

Fecal microbiota transplant involves the infusion of human probiotics through fecal enemas. Ulcerative colitis typically requires a more prolonged bacteriotherapy treatment than Clostridium difficile infection to be successful, possibly due to the time needed to heal the ulcerated epithelium. The response of ulcerative colitis is potentially very favorable with one study reporting 67.7% of people experiencing complete remission.[130] Other studies found a benefit from using fecal microbiota transplantation.[131][132][133]

Alternative medicine

A variety of alternative medicine therapies have been used for ulcerative colitis, with inconsistent results. Curcumin (turmeric) therapy, in conjunction with taking the medications mesalamine or sulfasalazine, may be effective and safe for maintaining remission in people with quiescent ulcerative colitis.[134][135] The effect of curcumin therapy alone on quiescent ulcerative colitis is unknown.[135]

Treatments using cannabis or cannabis oil are uncertain. So far, studies haven't determined its effectiveness and safety.[136]

Abdominal pain management

Many interventions have been considered to manage abdominal pain in people with ulcerative colitis, including FODMAPs diet, relaxation training, yoga, kefir diet and stellate ganglion block treatment. It is unclear whether any of these are safe or effective at improving pain or reducing anxiety and depression.[137]

Prognosis

Poor prognostic factors include: age < 40 years upon diagnosis, extensive colitis, severe colitis on endoscopy, prior hospitalization, elevated CRP and low serum albumin.[20]

Progression or remission

People with ulcerative colitis usually have an intermittent course, with periods of disease inactivity alternating with "flares" of disease. People with proctitis or left-sided colitis usually have a more benign course: only 15% progress proximally with their disease, and up to 20% can have sustained remission in the absence of any therapy. A subset of people experience a course of disease progress rapidly. In these cases, there is usually a failure to respond to medication and surgery often is performed within the first few years of disease onset.[138][139] People with more extensive disease are less likely to sustain remission, but the rate of remission is independent of the severity of the disease.[140] Several risk factors are associated with eventual need for colectomy, including: prior hospitalization for UC, extensive colitis, need for systemic steroids, young age at diagnosis, low serum albumin, elevated inflammatory markers (CRP & ESR), and severe inflammation seen during colonoscopy.[88][20] Surgical removal of the large intestine is necessary in some cases.[20]

Colorectal cancer

The risk of colorectal cancer is significantly increased in people with ulcerative colitis after ten years if involvement is beyond the splenic flexure. People with backwash ileitis might have an increased risk for colorectal carcinoma.[141] Those people with only proctitis usually have no increased risk.[20] It is recommended that people have screening colonoscopies with random biopsies to look for dysplasia after eight years of disease activity, at one to two year intervals.[142]

Mortality

People with ulcerative colitis are at similar[143] or perhaps slightly increased overall risk of death compared with the background population.[144] However, the distribution of causes-of-death differs from the general population.[143] Specific risk factors may predict worse outcomes and a higher risk of mortality in people with ulcerative colitis, including: C. difficile infection[20] and cytomegalovirus infection (due to reactivation).[145]

Epidemiology

Together with Crohn's disease, about 11.2 million people were affected as of 2015.[10] Each year, ulcerative colitis newly occurs in 1 to 20 per 100,000 people (incidence), and there are a total of 5-500 per 100,000 individuals with the disease (prevalence).[7][9] In 2015, a worldwide total of 47,400 people died due to inflammatory bowel disease (UC and Crohn's disease).[6] The peak onset is between 30 and 40 years of age,[14] with a second peak of onset occurring in the 6th decade of life.[146] Ulcerative colitis is equally common among men and women.[14][7] With appropriate treatment the risk of death appears similar to that of the general population.[3] UC has become more common since the 1950s.[7][9]

The geographic distribution of UC and Crohn's disease is similar worldwide,[147] with the highest number of new cases a year of UC found in Canada, New Zealand and the United Kingdom.[148] The disease is more common in North America and Europe than other regions.[9] In general, higher rates are seen in northern locations compared to southern locations in Europe[149] and the United States.[150] UC is more common in western Europe compared with eastern Europe.[151] Worldwide, the prevalence of UC varies from 2 - 299 per 100,000 people.[5] Together, ulcerative colitis and Crohn's disease affect about a million people in the United States.[11]

As with Crohn's disease, the rates of UC are greater among Ashkenazi Jews and decreases progressively in other persons of Jewish descent, non-Jewish Caucasians, Africans, Hispanics, and Asians.[23] Appendectomy prior to age 20 for appendicitis[152] and current tobacco use[153] are protective against development of UC.[14] However, former tobacco use is associated with a higher risk of developing the disease.[153][14]

United States

As of 2004, the number of new cases of UC in the United States was between 2.2 and 14.3 per 100,000 per year.[154] The number of people affected in the United States in 2004 was between 37 and 246 per 100,000.[154]

Canada

In Canada, between 1998 and 2000, the number of new cases per year was 12.9 per 100,000 population or 4,500 new cases. The number of people affected was estimated to be 211 per 100,000 or 104,000.[155]

United Kingdom

In the United Kingdom 10 per 100,000 people newly develop the condition a year while the number of people affected is 243 per 100,000. Approximately 146,000 people in the United Kingdom have been diagnosed with UC.[156]

History

The first description of ulcerative colitis occurred around the 1850s.[9]

Research

Helminthic therapy using the whipworm Trichuris suis has been shown in a randomized control trial from Iowa to show benefit in people with ulcerative colitis.[157] The therapy tests the hygiene hypothesis which argues that the absence of helminths in the colons of people in the developed world may lead to inflammation. Both helminthic therapy and fecal microbiota transplant induce a characteristic Th2 white cell response in the diseased areas, which was unexpected given that ulcerative colitis was thought to involve Th2 overproduction.[157]

Alicaforsen is a first generation antisense oligodeoxynucleotide designed to bind specifically to the human ICAM-1 messenger RNA through Watson-Crick base pair interactions in order to subdue expression of ICAM-1.[158] ICAM-1 propagates an inflammatory response promoting the extravasation and activation of leukocytes (white blood cells) into inflamed tissue.[158] Increased expression of ICAM-1 has been observed within the inflamed intestinal mucosa of ulcerative colitis patients, where ICAM-1 over production correlated with disease activity.[159] This suggests that ICAM-1 is a potential therapeutic target in the treatment of ulcerative colitis.[160]

Gram positive bacteria present in the lumen could be associated with extending the time of relapse for ulcerative colitis.[161]

A series of drugs in development looks to disrupt the inflammation process by selectively targeting an ion channel in the inflammation signaling cascade known as KCa3.1.[162] In a preclinical study in rats and mice, inhibition of KCa3.1 disrupted the production of Th1 cytokines IL-2 and TNF-∝ and decreased colon inflammation as effectively as sulfasalazine.[162]

Neutrophil extracellular traps[163] and the resulting degradation of the extracellular matrix[164] have been reported in the colon mucosa in ulcerative colitis patients in clinical remission, indicating the involvement of the innate immune system in the etiology.[163]

Fexofenadine, an antihistamine drug used in treatment of allergies, has shown promise in a combination therapy in some studies.[165][166] Opportunely, low gastrointestinal absorption (or high absorbed drug gastrointestinal secretion) of fexofenadine results in higher concentration at the site of inflammation. Thus, the drug may locally decrease histamine secretion by involved gastrointestinal mast cells and alleviate the inflammation.[166]

There is evidence that etrolizumab is effective for ulcerative colitis, with phase 3 trials underway as of 2016.[8][167][168][169] Etrolizumab is a humanized monoclonal antibody that targets he β7 subunit of integrins α4β7 and αEβ7. Etrolizumab decreases lymphocytes trafficking, similar to vedolizumab (another integrin antagonist).

A type of leukocyte apheresis, known as granulocyte and monocyte adsorptive apheresis, still requires large-scale trials to determine whether or not it is effective.[170] Results from small trials have been tentatively positive.[171]

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