Depression (mood)

Depression is a mental state of low mood and aversion to activity.[3] It affects more than 280 million people of all ages (about 3.5% of the global population).[4] Depression affects a person's thoughts, behavior, feelings, and sense of well-being.[5] Depressed people often experience loss of motivation or interest in, or reduced pleasure or joy from, experiences that would normally bring them pleasure or joy.[6] Depressed mood is a symptom of some mood disorders such as major depressive disorder and dysthymia;[7] it is a normal temporary reaction to life events, such as the loss of a loved one; and it is also a symptom of some physical diseases and a side effect of some drugs and medical treatments. It may feature sadness, difficulty in thinking and concentration and a significant increase or decrease in appetite and time spent sleeping. People experiencing depression may have feelings of dejection or hopelessness and may experience suicidal thoughts. It can either be short term or long term.

"Hopelessness" redirects here. For the album, see Hopelessness (album).
"Despair" redirects here. For other uses, see Despair (disambiguation).

Depression
Lithograph of a person diagnosed with melancholia and strong suicidal tendency in 1892
SpecialtyPsychiatry, psychology
SymptomsLow mood, aversion to activity, loss of interest, loss of feeling pleasure
CausesBrain chemistry, genetics, life events, medical conditions, personality[1]
Risk factorsStigma of mental health disorder[2]
Diagnostic methodPatient Health Questionnaire, Beck Depression Inventory
Differential diagnosisAnxiety, bipolar disorder, borderline personality disorder
PreventionSocial connections, physical activity
TreatmentPsychotherapy, psychopharmacology
Part of a series on
Emotions
Emotions

Contributing factors
Allegory on melancholy, from circa 1729–1740, etching and engraving, in the Metropolitan Museum of Art (New York City)

Life events

Adversity in childhood, such as bereavement, neglect, mental abuse, physical abuse, sexual abuse, or unequal parental treatment of siblings can contribute to depression in adulthood.[8][9] Childhood physical or sexual abuse in particular significantly correlates with the likelihood of experiencing depression over the survivor's lifetime.[10]

Life events and changes that may cause depressed mood include (but are not limited to): childbirth, menopause, financial difficulties, unemployment, stress (such as from work, education, military service, family, living conditions, marriage, etc.), a medical diagnosis (cancer, HIV, diabetes, etc.), bullying, loss of a loved one, natural disasters, social isolation, rape, relationship troubles, jealousy, separation, or catastrophic injury.[11][12][13][14][15] Adolescents may be especially prone to experiencing a depressed mood following social rejection, peer pressure, or bullying.[16]

Childhood and adolescence
Main article: Depression in childhood and adolescence

Depression in childhood and adolescence is similar to adult major depressive disorder, although young sufferers may exhibit increased irritability or behavioral dyscontrol instead of the more common sad, empty, or hopeless feelings seen with adults.[17] Children who are under stress, experiencing loss, or have other underlying disorders are at a higher risk for depression. Childhood depression is often comorbid with mental disorders outside of other mood disorders; most commonly anxiety disorder and conduct disorder. Depression also tends to run in families.[18]

Personality

Depression is associated with low extraversion,[19] and people who have high levels of neuroticism are more likely to experience depressive symptoms and are more likely to receive a diagnosis of a depressive disorder.[20]

Side effect of medical treatment

It is possible that some early-generation beta-blockers induce depression in some patients, though the evidence for this is weak and conflicting. There is strong evidence for a link between alpha interferon therapy and depression. One study found that a third of alpha interferon-treated patients had developed depression after three months of treatment. (Beta interferon therapy appears to have no effect on rates of depression.) There is moderately strong evidence that finasteride when used in the treatment of alopecia increases depressive symptoms in some patients. Evidence linking isotretinoin, an acne treatment, to depression is strong.[21] Other medicines that seem to increase the risk of depression include anticonvulsants, antimigraine drugs, antipsychotics and hormonal agents such as gonadotropin-releasing hormone agonist.[22]

Substance-induced

Several drugs of abuse can cause or exacerbate depression, whether in intoxication, withdrawal, and from chronic use. These include alcohol, sedatives (including prescription benzodiazepines), opioids (including prescription pain killers and illicit drugs such as heroin), stimulants (such as cocaine and amphetamines), hallucinogens, and inhalants.[23]

Non-psychiatric illnesses
Main article: Depression (differential diagnoses)

Depressed mood can be the result of a number of infectious diseases, nutritional deficiencies, neurological conditions,[24] and physiological problems, including hypoandrogenism (in men), Addison's disease, Cushing's syndrome, pernicious anemia, hypothyroidism, hyperparathyroidism, Lyme disease, multiple sclerosis, Parkinson's disease, chronic pain, stroke,[25] diabetes,[26] cancer,[27] and HIV.

Psychiatric syndromes
Main article: Depressive mood disorders

A number of psychiatric syndromes feature depressed mood as a main symptom. The mood disorders are a group of disorders considered to be primary disturbances of mood. These include major depressive disorder (commonly called major depression or clinical depression) where a person has at least two weeks of depressed mood or a loss of interest or pleasure in nearly all activities; and dysthymia, a state of chronic depressed mood, the symptoms of which do not meet the severity of a major depressive episode. Another mood disorder, bipolar disorder, features one or more episodes of abnormally elevated mood, cognition, and energy levels, but may also involve one or more episodes of depression.[28] When the course of depressive episodes follows a seasonal pattern, the disorder (major depressive disorder, bipolar disorder, etc.) may be described as a seasonal affective disorder.

Outside the mood disorders: borderline personality disorder often features an extremely intense depressive mood; adjustment disorder with depressed mood is a psychological response to an identifiable event or stressor, in which the resulting emotional or behavioral symptoms are significant but do not meet the criteria for a major depressive episode;[29] and posttraumatic stress disorder, a mental disorder that sometimes follows trauma, is commonly accompanied by depressed mood.[30]

Inflammation
This section is an excerpt from Inflammation § Connection to depression.[edit]

There is evidence for a link between inflammation and depression.[31] Inflammatory processes can be triggered by negative cognitions or their consequences, such as stress, violence, or deprivation. Thus, negative cognitions can cause inflammation that can, in turn, lead to depression.[32][33] In addition, there is increasing evidence that inflammation can cause depression because of the increase of cytokines, setting the brain into a "sickness mode".[34] Classical symptoms of being physically sick, such as lethargy, show a large overlap in behaviors that characterize depression. Levels of cytokines tend to increase sharply during the depressive episodes of people with bipolar disorder and drop off during remission.[35] Furthermore, it has been shown in clinical trials that anti-inflammatory medicines taken in addition to antidepressants not only significantly improves symptoms but also increases the proportion of subjects positively responding to treatment.[36]

Inflammations that lead to serious depression could be caused by common infections such as those caused by a virus, bacteria or even parasites.[37]

Historical legacy
Main article: Dispossession, oppression and depression

Researchers have begun to conceptualize ways in which the historical legacies of racism and colonialism may create depressive conditions.[38][39]

Measures

Measures of depression include, but are not limited to: Beck Depression Inventory-11 and the 9-item depression scale in the Patient Health Questionnaire (PHQ-9).[40] Both of these measures are psychological tests that ask personal questions of the participant, and have mostly been used to measure the severity of depression. The Beck Depression Inventory is a self-report scale that helps a therapist identify the patterns of depression symptoms and monitor recovery. The responses on this scale can be discussed in therapy to devise interventions for the most distressing symptoms of depression.[6]

Theories

Schools of depression theories include:

Management
Main article: Management of depression

Depressed mood may not require professional treatment, and may be a normal temporary reaction to life events, a symptom of some medical condition, or a side effect of some drugs or medical treatments. A prolonged depressed mood, especially in combination with other symptoms, may lead to a diagnosis of a psychiatric or medical condition which may benefit from treatment.

The UK National Institute for Health and Care Excellence (NICE) 2009 guidelines indicate that antidepressants should not be routinely used for the initial treatment of mild depression, because the risk-benefit ratio is poor.[41]

Physical activity has a protective effect against the emergence of depression in some people.[42]

There is limited evidence suggesting yoga may help some people with depressive disorders or elevated levels of depression, but more research is needed.[43][44]

Reminiscence of old and fond memories is another alternative form of treatment, especially for the elderly who have lived longer and have more experiences in life. It is a method that causes a person to recollect memories of their own life, leading to a process of self-recognition and identifying familiar stimuli. By maintaining one's personal past and identity, it is a technique that stimulates people to view their lives in a more objective and balanced way, causing them to pay attention to positive information in their life stories, which would successfully reduce depressive mood levels.[45]

There is limited evidence that continuing antidepressant medication for one year reduces the risk of depression recurrence with no additional harm.[46] Recommendations for psychological treatments or combination treatments in preventing recurrence are not clear.[46]

Epidemiology
Main article: Epidemiology of depression

Depression is the leading cause of disability worldwide, the United Nations (UN) health agency reported, estimating that it affects more than 300 million people worldwide – the majority of them women, young people and the elderly. An estimated 4.4 percent of the global population has depression, according to a report released by the UN World Health Organization (WHO), which shows an 18 percent increase in the number of people living with depression between 2005 and 2015.[47][48][49]

Depression is a major mental-health cause of disease burden. Its consequences further lead to significant burden in public health, including a higher risk of dementia, premature mortality arising from physical disorders, and maternal depression impacts on child growth and development.[50] Approximately 76% to 85% of depressed people in low- and middle-income countries do not receive treatment;[51] barriers to treatment include: inaccurate assessment, lack of trained health-care providers, social stigma and lack of resources.[4]

The stigma comes from misguided societal views that people with mental illness are different from everyone else, and they can choose to get better only if they wanted to.[52] Due to this more than half of the people with depression do not receive help with their disorders. The stigma leads to a strong preference for privacy.

The World Health Organization has constructed guidelines – known as The Mental Health Gap Action Programme (mhGAP) – aiming to increase services for people with mental, neurological and substance-use disorders.[4] Depression is listed as one of conditions prioritized by the programme. Trials conducted show possibilities for the implementation of the programme in low-resource primary-care settings dependent on primary-care practitioners and lay health-workers.[53] Examples of mhGAP-endorsed therapies targeting depression include Group Interpersonal Therapy as group treatment for depression and "Thinking Health", which utilizes cognitive behavioral therapy to tackle perinatal depression.[4] Furthermore, effective screening in primary care is crucial for the access of treatments. The mhGAP adopted its approach of improving detection rates of depression by training general practitioners. However, there is still weak evidence supporting this training.[50]

As of 2021, Iranians were one of the most depressed peoples on Earth, with the government reporting a 70% depression rate.[54][55][56][57][58][59]

History
Main article: History of depression

The term depression was derived from the Latin verb deprimere, "to press down".[60] From the 14th century, "to depress" meant to subjugate or to bring down in spirits. It was used in 1665 in English author Richard Baker's Chronicle to refer to someone having "a great depression of spirit", and by English author Samuel Johnson in a similar sense in 1753.[61]

In Ancient Greece, disease was thought due to an imbalance in the four basic bodily fluids, or humors. Personality types were similarly thought to be determined by the dominant humor in a particular person. Derived from the Ancient Greek melas, "black", and kholé, "bile",[62] melancholia was described as a distinct disease with particular mental and physical symptoms by Hippocrates in his Aphorisms, where he characterized all "fears and despondencies, if they last a long time" as being symptomatic of the ailment.[63]

During the 18th century, the humoral theory of melancholia was increasingly being challenged by mechanical and electrical explanations; references to dark and gloomy states gave way to ideas of slowed circulation and depleted energy.[64] German physician Johann Christian Heinroth, however, argued melancholia was a disturbance of the soul due to moral conflict within the patient.

In the 20th century, the German psychiatrist Emil Kraepelin distinguished manic depression. The influential system put forward by Kraepelin unified nearly all types of mood disorder into manic–depressive insanity. Kraepelin worked from an assumption of underlying brain pathology, but also promoted a distinction between endogenous (internally caused) and exogenous (externally caused) types.[65]

Other psycho-dynamic theories were proposed. Existential and humanistic theories represented a forceful affirmation of individualism.[66] Austrian existential psychiatrist Viktor Frankl connected depression to feelings of futility and meaninglessness.[67] Frankl's logotherapy addressed the filling of an "existential vacuum" associated with such feelings, and may be particularly useful for depressed adolescents.[68][69]

Researchers theorized that depression was caused by a chemical imbalance in neurotransmitters in the brain, a theory based on observations made in the 1950s of the effects of reserpine and isoniazid in altering monoamine neurotransmitter levels and affecting depressive symptoms.[70] During the 1960s and 70s, manic-depression came to refer to just one type of mood disorder (now most commonly known as bipolar disorder) which was distinguished from (unipolar) depression. The terms unipolar and bipolar had been coined by German psychiatrist Karl Kleist.[65]

In July 2022, British psychiatrist Joanna Moncrieff, also psychiatrist Mark Horowtiz and others proposed in a study on academic journal Molecular Psychiatry that depression is not caused by a serotonin imbalance in the human body, unlike what most of the psychiatry community points to, and that therefore anti-depressants do not work against the illness.[71][72] However, such study was met with criticism from some psychiatrists, who argued the study's methodology used an indirect trace of serotonin, instead of taking direct measurements of the molecule.[73] Moncrieff said that, despite her study's conclusions, no one should interrupt their treatment if they are taking any anti-depressant.[73]

See also

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