Depression

Depression is a psychiatric disorder characterized by a pervasive low mood, loss of interest in a person\'s usual activities and diminished ability to experience pleasure. The course of clinical depression varies widely: it can be a once-in-a-lifetime event or have multiple recurrences; it can appear either gradually or suddenly; and can either last for a few months or be a life-long disorder. The onset is usually in early- to mid-adulthood. Diagnosis is based on the patient\'s self-reported experiences and observed behavior; there is no laboratory test for major depression.

Although the term \"depression\" is commonly used by laypersons to describe a temporary depressed mood, when a person may feel sad or \"down\", clinical depression is a serious and often disabling condition that can significantly affect a person\'s work, family and school life, sleeping and eating habits, general health and ability to enjoy life.

Depression is a major risk factor for suicide; in addition, people with depression suffer from higher mortality from other causes.Clinical depression may be isolated or be a secondary result of a primary condition such as bipolar disorder or chronic pain. When specific treatment is indicated, it usually consists of psychotherapy and antidepressants.