Bipolar disorder is a mental illness characterized by periods of depression and periods of elevated mood and energy known as mania. It can be caused by genetic and biological factors such as imbalances in neurotransmitters like serotonin and catecholamines. Environmental and social stressors can also play a role. Treatment involves pharmacotherapy with antidepressants, antipsychotics, or mood stabilizers. Psychotherapies like cognitive behavioral therapy and electroconvulsive therapy may also be used. The goal of treatment is to reduce symptoms, prevent relapse, and help the individual learn coping strategies.