The individual must be experiencing five or more symptoms during a two-week period, with at least one of these being (1) sad mood or (2) loss of interest or pleasure.
Depressed most of the day, almost every day. A diagnosis of major depressive illness (clinical depression) indicates that you have felt sad, down, or worthless on most days for at least two weeks, in addition to additional symptoms such as sleep problems, loss of interest in activities, or a change in appetite. The symptoms of major depression differ from person to person. Some of these signs and symptoms must be present for at least two weeks in order to be diagnosed with major depressive disorder.
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