Bipolar disorder is a brain disorder that causes severe mood swings between manic highs and depressive lows. There are two main types of bipolar disorder - bipolar I is characterized by one or more manic or mixed episodes, while bipolar II involves at least one major depressive episode and one hypomanic episode. Symptoms include changes in activity, energy, and ability to function. Treatment involves mood stabilizing medications and psychotherapy to help manage symptoms and gain control over mood swings. Living with bipolar disorder involves periods of mania, depression, normal days in between episodes, and ongoing therapy and medication management.