The document discusses bipolar mood disorder (BMD), which is characterized by recurrent episodes of mania and depression in the same patient at different times. It can begin between ages 20-30 and sometimes in childhood. BMD involves extreme highs and lows, and is classified based on current mood episode. Causes are unknown but genetic and environmental factors may play roles. Symptoms include expansive mood and decreased need for sleep during manic phases, and low mood and lack of interest during depressive phases. Diagnosis is based on symptoms and criteria from the DSM-5. Treatment involves lithium, anticonvulsants, antidepressants, and antipsychotics. Episodes typically last 3-4 months for man