Bipolar disorder is a mood disorder characterized by periods of depression and mania. During manic phases, people feel irritable, hyperactive, and have racing thoughts. They may engage in risky behaviors like drug use. Depressive phases involve symptoms like suicidal thoughts, low self-esteem, and changes in appetite and sleep. Bipolar disorder can be managed through therapy, medication, stress reduction, and social support. It is a lifelong condition but many people live fulfilling lives with proper treatment.