As a heterogenous disorder ... dysregulation triggering low mood or loss of interest or pleasure in activities, leading to impaired functioning. Models of depression pathogenesis have advanced ...

"The grey drizzle of horror," author William Styron memorably called depression. The mood ... disorder, and increasing numbers of them are young people. Depression comes in forms ranging from ...

Major depressive disorder (MDD), also referred to as clinical depression or depression, is a mood disorder where a person has a consistently low or depressed mood and no longer finds interest in ...

Bipolar disorder, formerly called manic depression, is characterized by moods that cycle between extreme highs (mania) and lows (depression), often with periods of neutral mood in between.

Bipolar II disorder ... mood and levels of energy and activity. According to the current diagnostic criteria, a doctor may diagnose bipolar II if a person experiences at least one major depressive ...