key term - Major Depressive Disorder

Definition

Major Depressive Disorder is a mood disorder characterized by persistent feelings of sadness, hopelessness, loss of interest or pleasure in activities, changes in appetite or sleep patterns, difficulty concentrating, and thoughts of suicide. These symptoms must persist for at least two weeks and significantly impair daily functioning.

Related terms

Bipolar Disorder:

Bipolar disorder involves alternating periods of depression and mania (elevated mood and energy) or hypomania (milder form of mania). It is different from major depressive disorder because it includes episodes of elevated mood as well.

Persistent Depressive Disorder:

Persistent depressive disorder, also known as dysthymia, is a chronic and milder form of depression. Symptoms are less severe but last longer (at least two years).

Seasonal Affective Disorder (SAD):

SAD is a type of depression that occurs in patterns associated with the changing seasons, typically starting in fall or winter and improving with the arrival of spring.