Depression that tends to occur (and recur) as the days grow shorter in the fall and winter. It is believed that affected persons react adversely to the decreasing amounts of light and the colder temperatures as the fall and winter progress. Seasonal affective disorder has not been recognized very long as a medical condition. The term first appeared [..]

with regard to the DSM-III, virtually any of a mass of dysfunctions marked by an extended, permanent disruption of mood not as a result of any sort of other tangible or cognitive illness. This specifi [..]

Since affect is a general term for feelings, emotion, or moods, affective disorder is a disorder characterized by wide fluctuation of feelings, emotions, and/or moods. For example, a person with affec [..]

A disorder of mood, such as depression or bipolar disorder.

A category of disorders in which the individual experiences excessive depression or elation. Examples include depression and bipolar disorder (manic-depression).

Alcohol- or drug-induced changes in affect that persist beyond the period during which a direct effect of the alcohol or drug might reasonably be assumed to be operating. See also

Those disorders that have a disturbance in mood as their predominant feature.

Disorders in which the essential feature is a severe disturbance in mood (Depression, Anxiety, elation, and excitement) accompanied by psychotic symptoms such as Delusions, Hallucinations, gross impai [..]

A Syndrome characterized by Depressions that recur annually at the same Time each year, usually during the winter months. Other symptoms include Anxiety, irritability, decreased energy, increased Appe [..]

a category of mental health problems that include depressive disorders.