Bipolar disorder is a mental health condition that affects a person's mood, energy, and ability to function. It is characterized by episodes of mania and depression, which can vary in severity and duration. People with bipolar disorder may experience periods of high energy, impulsivity, and euphoria during manic episodes, followed by periods of low mood, sadness, and hopelessness during depressive episodes. Treatment for bipolar disorder typically involves a combination of medication and therapy.