Bipolar disorder, also known as manic-depressive illness, is a mental health condition marked by extreme mood swings, including episodes of mania and depression. During manic episodes, individuals may exhibit increased energy, irritability, and impulsive behaviors, while depressive episodes are characterized by feelings of sadness and hopelessness. Mood swings can be rapid and unpredictable, affecting daily functioning and relationships. Individuals may also experience mixed states, where symptoms of both mania and depression occur simultaneously. Diagnosing bipolar disorder involves a comprehensive evaluation by a mental health professional using the DSM-5 criteria, which requires at least one manic or hypomanic episode. Assessment tools like the Mood Disorder Questionnaire (MDQ) help quantify symptoms and severity. A physical examination may rule out other medical conditions contributing to symptoms. Accurate diagnosis is essential for effective treatment, which may include medication and psychotherapy. Bipolar disorder can also lead to psychotic symptoms in severe cases. Early intervention is crucial to manage the disorder effectively and improve quality of life.