Mood disorders = gross deviations in mood. Periods of depressed or elevated mood lasting days or weeks, including: Extremely depressed mood and/or loss of pleasure (anhedonia) Lasts most of the day, nearly every day for at least two weeks. At least 4 additional physical or cognitive symptoms: E. g. , indecisiveness, feelings of worthlessness, fatigue, appetite change, restlessness or feeling slowed down, sleep disturbance, significant weight change, suicidality, poor concentration. Elevated, expansive mood for at least one week. Inflated self-esteem, decreased need for sleep, excessive talkativeness, flight of ideas or sense that thoughts are racing, easy distractibility, increase in goal-directed activity or psychomotor agitation, excessive involvement in pleasurable but risky behaviors. Associated with less impairment than a manic episode (e. g. , less risky behavior) May not be problematic in and of itself, but usually occurs in the context of a more problematic mood disorder. Mixed features = term for a mood episode with some elements reflecting the opposite valence of mood.