What exactly is depression?

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Depression is often a reaction to a life event such as bereavement, or it may have no obvious cause. In depression, people have low moods which persist for months or years. Feeling tearful and low, particularly in the morning; lack of energy and confidence; find it hard to concentrate or make decisions; sleep problems, loss of sex drive; changes in appetite; frequent crying spells; and suicidal thoughts are the symptoms of depression.