Acute onset is a term in clinical psychology used to describe psychological disorders/abnormalities that may have been pre-existing and therefore start out very quickly and develop or progress slowly. They usually come sithout warning.
A psychological or mental disorder is a condition that causes impaired mental behaviors and is characterized by unexpected cultural reactions to situations.
In <u>acute onset mental disorders, symptoms occur </u><u>suddenly</u><u>, while in insidious onset mental disorders, symptoms occur </u><u>gradually</u><u>.</u>