Mood disorders have as their central feature a disturbance in mood. Mood disorders include:
- Major Depressive Disorder, which requires at least two weeks of depressed mood or loss of interest in activities that were previously enjoyed and a minimum of four addtional symptoms.
- Dysthymic Disorder, which consists of at least two years of depressed mood for most days, but does not meet the criteria for Major Depressive Disorder.
- Bipolar I Disorder, which consists of one or more manic or mixed episodes, and usually major depressive episodes.
- Bipolar II Disorder, which consists of at least one or more major depressive episodes and at least one hypomanic episode.
- Cyclothymic Disorder, which consists of at least two years of episodes of hypomanic episodes that do not meet the criteria for manic episodes, and depressive episodes that do not meet the criteria for major depressive episodes.
- Mood Disorder Due to a General Medical Condition, which consists of a mood disorder that is a direct physiological consequence of a medical condition.
- Substance Induced Mood Disorder, which consists of a mood disturbance due to a physiological response to a mood altering, addictive drug or alcohol, a medication, a toxin, or due to a biological treatment for depression.
Adapted from "Diagnostic And Statistical Manual of Mental Disorders, Fourth Edition," American Psychiatric Association, 1994.