See Major Depression and Depression.

Affective disorder characterized by such symptoms as a prolonged sense of friendlessness, inability to have fun or concentrate, fatigue, extreme activity or apathy, feelings of worthlessness, weight change, physical complaints, and thoughts of death or suicide.

Depression is a health problem that can impact feelings, thoughts and behavior and can manifest itself with physical symptoms of illness. As many as 1 in 33 children have clinical depression.

Similar to depression in adults. Children may show depression by being unable to enjoy activities that they once enjoyed, complaining about physical ailments, or may seem bored and have problems concentrating, among other symptoms.

A childhood psychiatric disorder marked by feelings of extraordinary sadness; difficulty concentrating, eating, and sleeping, as well as helplessness; a bleak outlook on life; and a preoccupation with death. See also Depression. Clinical Psychologist A person trained and educated to perform psychological research, testing, and therapy. Engages in intellectual assessment and addresses issues relating to an individual's mental and emotional health.