Mental depression

Experimental visualization of narrower problems
Other Names:
Clinical depression
Mental breakdown
Depressive psychosis
Depressive neuroses
Major depressive disorder
Mentally depressed people

Depression is a disease with a specific set of symptoms, notably a persistent feeling of sadness and loss of interest. Depression sufferers lose vitality, self-esteem and experience mood disorders. Depression is the cause of unreasonable and unnecessary suffering for millions of people, often to the point of disabling the sufferer. Depressed individuals usually struggle with completing their day-to-day tasks, feeling as if there’s no more point in living. 

Depressive disorders can be found throughout the world. Depressive patients account for a significant proportion of all those requiring mental heath care and, as the majority of them remain untreated, their suffering continues to disable them and to cause losses to their families and communities. The situation is especially severe in developing countries. Lack of adequate detection and treatment is due to poorly-trained health workers, scarce resources, and insufficient knowledge.

By 2020 depression will be the second most debilitating disease, yet in many parts of the world depression is stigmatized, with many people refusing treatment for fear of social backlash. Even so, tremendous strides are being made in the study and treatment of depression, including a better understanding of its causes and how best to treat it.

In psychiatry, a major depressive episode refers to a clinical syndrome consisting of lowering of mood-tone (feelings of painful dejection), and loss of interest or pleasure in all, or almost all, activities, most of the time for a period of at least two weeks. It is experienced as a paralyzing listlessness, dejection and self-deprecation, as well as an overwhelming sense of hopelessness. It is a pathological state of conscious psychic suffering and guilt, accompanied by a marked reduction in the sense of personal values, and a diminution of mental, psychomotor, and even organic activity, unrelated to actual deficiency. As used by the layman, the word depression refers to the mood element, which in psychiatry would more appropriately be labelled dejection, sadness, gloominess, despair or despondency. Dysthymia is the state just below the threshold for major depression.


Depression is widespread; an estimated 100 million people develop clinically recognizable depression every year; between 5 and 7% of the world's population is estimated to be depressed at any given time; in 2018 approximately  300 million people are dealing with depression.

A report from the World Health Organization shows an 18% increase in worldwide depression rates between 2005 and 2015, with the prediction that this number would continue to rise.

Even in developed, industrialized countries, depression is rampant;  in the United States, between 2013 and 2016, 8.1 percent of Americans who were 20 years old and older suffered from depression in a given two-week period.  In 2018, the U.S. health insurer Blue Cross Blue Shield reports diagnoses of clinical depression have increased by 33 percent in the previous five years among its 41 million privately insured members.  The Blue Cross data suggests 85 percent of depression sufferers battle at least one other health condition, whereas nearly one-third of depressed people present with four or more additional health concerns.  A survey by the American Psychiatric Association indicates rates of anxiety are up in the U.S., whereas data from health insurer Cigna points to increasing levels of loneliness among Americans.

Depression is costly; it is the number one cause of disability in the world. Studies on depression have produced alarming figures. A depressed person, for example, is four times more likely to suffer a heart attack than a non-depressed person is. If a depressed person does have a heart attack, he or she is four times more likely to die. Elderly people who are depressed, even mildly depressed, have a 24 percent increased risk of dying than non-depressed people. In some countries the likelihood that people born after 1955 will suffer a major depression at some point in life is more than three times greater than for their grandparents' generation. In the USA, for example, of Americans born before 1905, only 1% had suffered a depression by age 75; of those born since 1955, 6% had become depressed by age 24. Those under 40 are three times more likely to become severely depressed than are older groups. In 2000, it was estimated from surveys that 10% of Americans suffer from clinical depression; millions more were believed to suffer depressed mood that was not severe enough to earn a diagnosis but still interferes with their lives. Of an estimated 50,000-70,000 suicides in the USA each year, up to 60% occur among persons suffering from depression. Approximately 125,000 people in the USA are hospitalized each year with depression, a further 200,000 are treated by psychiatrists, and 4 to 8 million more are in need of help but do not realize it. More women than men are treated for depression, and the largest occupational group is homemakers.  Up to 33 percent of people suffering from clinical depression are prone to drug or alcohol problems.

Research by the US Mental Health Foundation shows that one in four adults suffers from significant depression. Students are particularly likely to have this trouble, with 46 percent of male and 64 percent of female students significantly disturbed by depression. 

In Florence, Italy, those born between 1945 and 1955 were beginning to show an increase in the rates of depression compared with previous generations by the age of 15. By the time they reached 30, their rate of depression was about 18%. In Beirut, this rise in depression understandably seemed to track political events, sharply rising during the years of the civil war and instability. Of 175,000 admissions to mental illness hospitals and psychiatric units in the UK in 1969, 66,000 were suffering from depression.

Related UN Sustainable Development Goals:
GOAL 3: Good Health and Well-beingGOAL 10: Reduced Inequality
Problem Type:
D: Detailed problems
Date of last update
15.04.2022 – 10:33 CEST