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Major depression
Alternative names Depression - major; Unipolar depression; Major depressive disorder
Definition
Major depression is when 5 or more symptoms of depression are present for at least 2 weeks. These symptoms include feeling sad, hopeless, worthless, or pessimistic. In addition, people with major depression often have behavior changes, such as new eating and sleeping patterns. Major depression increases a person's risk of suicide.
Causes, incidence, and risk factors
The exact cause of depression is not known. Many researchers believe it is caused by chemical imbalances in the brain, which may be hereditary or caused by events in a person's life.
Some types of depression seem to run in families, but depression can also occur in people who have no family history of the illness. Stressful life changes or events can trigger depression in some people. Usually, a combination of factors are involved in the development of major depression.
Major depression is one of the most common chronic conditions. Each year, more than 18 million Americans -- men and women of all ages, races, and economic levels -- suffer from depression. It occurs more often in
Ralph Giarnella MD
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