Severe depression that comes on suddenly or seems to have no external cause is called ______.

A) dysthymia
B) bipolar disorder
C) hypomania
D) major depressive disorder

Severe Depression

A psychological ailment manifested by an enduringly low mood or disinterest in hobbies, substantially interfering with normal life.

Major Depressive Disorder

A mental disorder characterized by persistent sadness, lack of interest in activities, and additional physical and cognitive symptoms, affecting daily functioning.

External Cause

External cause involves factors or events outside an individual that have an impact on their behavior or the outcome of a situation.