Bloating

Abdominal bloating (or simply Bloating) is a short-term disease that affects the gastrointestinal tract.[1][2] Bloating is generally characterized by an excess buildup of gas, air or fluids in the stomach. A person may have feelings of tightness, pressure or fullness in the stomach; it may or may not be accompanied by a visibly distended abdomen.[3] Bloating can affect anyone of any age range and is usually self-diagnosed, in most cases does not require serious medical attention or treatment.[4][5] Although this term is usually used interchangeably with abdominal distension, these symptoms probably have different pathophysiological processes, which are not fully understood.[6]

Bloating
SpecialtyGastroenterology 
Symptoms
DurationA few hours to days
Causes
Risk factors
Prevention
  • Eating high fiber foods
  • Drinking water
  • Exercise
Treatment
Frequency
  • 10% - 25% of healthy people
  • 75% of women experience bloating before or during their period
  • 10% Experience bloating regularly

The first step for the management is to find a treatment for the underlying causes that produce it through a detailed medical history and a physical examination. The discomfort can be alleviated by the use of certain drugs and dietary modifications.[4]

Bloating can also be caused by chronic conditions and in rare cases can be a reoccurring life-threatening problem.[7]

Symptoms and signs

The most common symptom associated with bloating is a sensation that the abdomen is full or distended. Rarely, bloating may be painful or cause shortness of breath.

Pains that are due to bloating will feel sharp and cause the stomach to cramp. These pains may occur anywhere in the body and can change locations quickly.[8] They are so painful that they are sometimes mistaken for heart pains when they develop on the upper left side of the chest. Pains on the right side are often confused with problems in the appendix or the gallbladder.

One symptom of gas that is not normally associated with it is the hiccup. Hiccups are harmless and will diminish on their own; they also help to release gas that is in the digestive tract before it moves down to the intestines and causes bloating. Important but uncommon causes of abdominal bloating include ascites and tumors.[9]

Causes

There are many causes of bloating, including: diet, irritable bowel syndrome, lactose intolerance, reflux, and constipation.[10][11][12][13] Specific medical conditions like Crohn's disease or bowel obstruction can also contribute to the amount of stomach bloating experienced.

Common causes of abdominal bloating are:

Important but uncommon causes of abdominal bloating include:

In animals, causes of abdominal bloating include:

  • Gastric dilatation volvulus, a condition of dogs which occurs when gas is trapped inside the stomach and gastric torsion prevents it from escaping [28]
  • Ruminal tympany, a condition of ruminant animals which occurs when gas cannot escape from the rumen.

All the factors mentioned contribute to bloated stomach abdominal pain.

Every person produces gases in their body during the digestion of food, such as methane, hydrogen, carbon dioxide, and nitrogen. And some of them are released outside the body, sometimes in small quantities that one does not notice and sometimes in larger quantities that may affect the normal course of life.

Fiber

Most cases of stomach bloating are due to improper diet. Gas occurs because of the bacteria in the colon and is a by-product of soluble fiber digestion. Inadequate or irregular intake of fiber and water will cause a person to experience bloating or constipation. The most common natural sources of fiber include fruits and vegetables as well as wheat or oat bran. These fibers are most likely to cause flatulence.[29] Fiber is made by plants and is not easily digested by the human gastrointestinal tract. There are two main types of dietary fiber: soluble and insoluble fiber. Soluble fiber is prebiotic and readily fermented in the colon into gases, while insoluble fiber is metabolically inert and absorbs water as it moves through the digestive system, aiding in defecation. Most types of fiber (insoluble) are attached to body water in the intestine and increase the volume of stools.

Bowel gas

Gas in the gastrointestinal tract has only two sources. It is either swallowed air or is produced by bacteria that normally inhabit the intestines, primarily the colon.[30]

Belching or burping is a universal ability that works by removing gas from the stomach through the mouth. The stomach can become bloated when too much air is swallowed during eating and drinking too quickly. As the stomach swells, belching removes the gas and alleviates the pain associated with it. Burping can also be used as a form of relief from abdominal discomfort other than too much gas in the stomach.

Flatulence, or farting, provides relief of much the same kind as burping, but involves the passage of gas from the body via the anus, not the mouth. Bacteria present in the intestinal tract cause gas that is expelled from the anus. They produce the gas as food is digested and moved from the small intestine. This gas builds up and causes swelling or bloating in the abdominal area before it is released.

Constipation

A common gastrointestinal problem is constipation—infrequent bowel movements, hard stools, or strain during the movements—which causes serious cases of bloating. Since most cases of constipation are temporary, simple lifestyle changes, such as getting more exercise and increasing one's intake of fiber, can go a long way toward alleviating constipation.[31] Some cases of constipation will continue to worsen and require unconventional methods to release the feces and reduce the amount of stomach bloating. Blood in the stool, intense pain in the abdomen, rectal pain, and unexplained weight loss should be reported to a doctor. Bloating consistently accompanies constipation, and they will not develop without an underlying cause.[22]

Heartburn and acid reflux

Painful burning sensations in the chest that are caused by gastroesophageal reflux is known as heartburn. Reflux is the backflow of gastric acid juices from the stomach into the oesophagus.[32] Heartburn has different triggers, including certain foods, medications, obesity, and stress. These triggers are different for each individual. Gastroesophageal reflux disease or GERD is a chronic condition that can lead to more serious complications like esophageal cancer.[33] Treatment options are available to treat the symptoms and the condition, but there is no cure for the disease. Symptoms include burping, abdominal and stomach bloating, along with pain and discomfort. Heavy meals, lying down or bending over after eating should be avoided to help prevent reflux from occurring. The stomach bloating experienced with reflux is intense and will remain until the food is digested all the way.

Postmortem bloating occurs in cadavers, due to the formation of gases by bacterial action and putrefaction of the internal tissues of the abdomen and the inside of the intestines.[34]

Conditions that are related to bloating include constipation, lactose intolerance, and acid reflux disease.[32] All of these conditions share the same symptoms and can share the same causative agents. These causes include unhealthy diet, smoking, alcohol consumption, low amount of exercise, and overall health. Each of these conditions can be experienced as a symptom of the others and is also a cause for each of them. In most cases where one of the conditions is present, there is at least one if not two of the others. Treatment for each condition is performed using the same medications and recommended dietary changes like increased fiber intake and reduced fat intake. If the conditions develop into diseases such as gastroesophageal reflux disease or chronic constipation, additional medications will be required. Bloating and flatulence are sometimes related to constipation, and treating the underlying condition may be helpful.[35]

Treatment

There are many over-the-counter (OTC) medications that can be used to treat bloating. Food enzymes can be found in some products that will help break down the sugars found in grains, vegetables and dairy products. They can be taken before food is consumed or added to the food that causes the gas and bloating. The most common treatment is antacids. These medications have no effect on the gas that is present in the intestines but enable gas build-up to be belched away more easily, reducing the amount of bloating that develops. Another treatment is Simethicone, an oral anti-foaming agent that helps the body to expel the gas more quickly. Also combinations of prokinetics, such as domperidone + metoclopramide + diphenhydramine (the latter for the prevention of extrapyramidal reactions, especially acute dystonic reactions) + proton pump inhibitors (PPIs), have dramatic effects on bloaters and belchers especially.

Notes
  1. staff, familydoctor org editorial; Rice, Alex. "Bloating - Bloated Stomach - What Causes Bloating?". familydoctor.org. Retrieved 2022-02-22.
  2. "Bloated Stomach: Causes, Tips to Reduce & When to be Concerned". Cleveland Clinic. Retrieved 2022-02-22.
  3. "Bloating: Causes and Prevention Tips". www.hopkinsmedicine.org. 20 September 2021. Retrieved 2022-02-22.
  4. Seo AY, Kim N, Oh DH (2013). "Abdominal bloating: pathophysiology and treatment". J Neurogastroenterol Motil (Review). 19 (4): 433–53. doi:10.5056/jnm.2013.19.4.433. PMC 3816178. PMID 24199004.
  5. Abdominal bloating, National Institutes of Health, Retrieved November 7, 2013
  6. Lacy BE, Gabbard SL, Crowell MD (2011). "Pathophysiology, evaluation, and treatment of bloating: hope, hype, or hot air?". Gastroenterol Hepatol (N Y) (Review). 7 (11): 729–39. PMC 3264926. PMID 22298969.
  7. "Abdominal bloating: Causes, symptoms and remedies". www.medicalnewstoday.com. 2020-01-14. Retrieved 2022-02-22.
  8. Gas and Gas Pains Mayo Clinic. Retrieved on 2010-01-26
  9. Abdominal Bloating MedLine Plus. Retrieved on 2010-01-26
  10. Talley NJ (November 2006). "Irritable bowel syndrome". Internal Medicine Journal. 36 (11): 724–8. doi:10.1111/j.1445-5994.2006.01217.x. PMC 1761148. PMID 17040359.
  11. "Lactose Intolerance". NIDDK. June 2014. Archived from the original on 25 October 2016. Retrieved 25 October 2016.
  12. "Acid Reflux (GER & GERD) in Adults". National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK). 5 November 2015. Archived from the original on 22 February 2020. Retrieved 21 February 2020.
  13. "Constipation". The Lecturio Medical Concept Library. Retrieved 10 July 2021.
  14. Brunicardi, Charles (2015). Schwartz's Principles of Surgery (10 ed.). McGraw-Hill. pp. ch 26.
  15. "Lactose Intolerance". The Lecturio Medical Concept Library. Retrieved 27 July 2021.
  16. "Premenstrual syndrome (PMS) fact sheet". Office on Women's Health. December 23, 2014. Archived from the original on 28 June 2015. Retrieved 23 June 2015.
  17. Dickerson, Lori M.; Mazyck, Pamela J.; Hunter, Melissa H. (2003). "Premenstrual Syndrome". American Family Physician. 67 (8): 1743–52. PMID 12725453. Archived from the original on 2008-05-13.
  18. National Institute of Allergy and Infectious Diseases (July 2012). "Food Allergy An Overview" (PDF). Archived from the original (PDF) on 2016-03-05.
  19. Levitt MD, Furne J, Aeolus MR, Suarez FL (1998). "Evaluation of an extremely flatulent patient: case report and proposed diagnostic and therapeutic approach". Am J Gastroenterol. 93 (11): 2276–81. doi:10.1111/j.1572-0241.1998.00635.x. PMID 9820415. S2CID 20991299.
  20. "Symptoms & Causes of Celiac Disease". NIDDK. June 2016. Retrieved 15 April 2018.
  21. Czaja-Bulsa G (Apr 2015). "Non coeliac gluten sensitivity – A new disease with gluten intolerance". Clin Nutr (Review). 34 (2): 189–94. doi:10.1016/j.clnu.2014.08.012. PMID 25245857.
  22. "Constipation". The Lecturio Medical Concept Library. Retrieved 27 July 2021.
  23. Feuerstein, JD; Falchuk, KR (August 2016). "Diverticulosis and Diverticulitis". Mayo Clinic Proceedings (Review). 91 (8): 1094–1104. doi:10.1016/j.mayocp.2016.03.012. PMID 27156370.
  24. "Ovarian Cancer Prevention". NCI. December 6, 2013. Archived from the original on 6 July 2014. Retrieved 1 July 2014.
  25. Seiden, Michael (2015). "Gynecologic Malignancies, Chapter 117". MGraw-Hill Medical. Archived from the original on September 10, 2017. Retrieved June 24, 2017.
  26. "Megacolon". The Lecturio Medical Concept Library. Retrieved 27 July 2021.
  27. "Cardiopulmonary Resuscitation (CPR)". The Lecturio Medical Concept Library. Retrieved 5 August 2021.
  28. Bloat in Dogs: Causes, Risks and Treatment Pack of Pets. Retrieved on 2018-02-05
  29. Fiber And Increased Gas MedicineNet. Retrieved on 2010-01-19
  30. What Causes Flatulence, bloating thesananews.com Retrieved on 2021-09-27
  31. Constipation Definition Mayo Clinic Retrieved on 2010-01-19
  32. "Gastroesophageal Reflux Disease". The Lecturio Medical Concept Library. Retrieved 23 July 2021.
  33. "Esophageal Cancer". The Lecturio Medical Concept Library. 26 October 2020. Retrieved 23 July 2021.
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References
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