What is bipolar disorder?
Bipolar disorder is a mental health condition characterized by episodes of significant mood changes — from the elevated, energized states of mania or hypomania to the depressed lows of major depressive episodes. These mood episodes are distinct from the normal ups and downs everyone experiences and significantly affect energy, activity, sleep, judgment, and the ability to think clearly.
Approximately 4.4% of US adults experience bipolar disorder at some point in their lives. It affects men and women equally and typically first appears in the late teens or early twenties — though it can develop at any age.
Types of bipolar disorder
Bipolar I disorder
Defined by manic episodes lasting at least 7 days, or shorter if severe enough to require hospitalization. Depressive episodes typically also occur, lasting at least 2 weeks. Bipolar I can be severe and may include psychotic features during manic episodes.
Bipolar II disorder
Characterized by hypomanic episodes (less severe than full mania, lasting at least 4 days) and major depressive episodes. Bipolar II is not a milder form of Bipolar I — the depressive episodes are often more frequent and prolonged, causing significant impairment.
Cyclothymic disorder
A milder but chronic form involving numerous periods of hypomanic symptoms and depressive symptoms over at least 2 years that do not meet full criteria for hypomanic or depressive episodes.
Recognizing mania and depression
Manic symptoms include decreased need for sleep (feeling rested after only 3 hours), elevated or irritable mood, grandiosity, racing thoughts, pressured speech, increased goal-directed activity, and risky behavior. Depressive symptoms mirror major depressive disorder: persistent sadness, loss of interest, fatigue, cognitive difficulties, and in severe cases, suicidal thoughts.
Bipolar disorder is often misdiagnosed as depression — particularly Bipolar II — because people more commonly seek help during depressive episodes. An accurate diagnosis requires asking specifically about lifetime history of elevated or energized periods.
Treatment: medication is essential
Bipolar disorder requires medication management as a core component of treatment. Mood stabilizers including lithium, valproate, and lamotrigine have the strongest evidence base. Second-generation antipsychotics are frequently used for both acute mania and maintenance. Antidepressants are used cautiously as they can trigger manic episodes when not paired with a mood stabilizer.
Psychotherapy — particularly Cognitive Behavioral Therapy and psychoeducation — is highly effective when combined with medication. Interpersonal and Social Rhythm Therapy (IPSRT), which focuses on stabilizing daily routines and sleep patterns, has particularly strong evidence for bipolar disorder.