Bipolar disorder is a mental health condition characterized by severe mood swings between depression and elation or mania. These are known as cycles. There are four types of bipolar disorders: bipolar I disorder, bipolar II disorder, cyclothymic disorder, and bipolar disorder due to substance/medication or another medical condition. In addition, there are atypical bipolar conditions that fall into the diagnostic categories of “other specified bipolar and related disorder” and “unspecified bipolar and related disorder.”
Bipolar I disorder is marked by “manic episodes” which are distinct periods of elevated, expansive, or irritable mood, with increased goal-directed activity or energy, lasting at least 7 days.
A manic episode is severe enough to cause impairment in social or occupational functioning, require hospitalization to prevent harm to self or others, or result in psychotic features. For a bipolar diagnosis, the manic episode cannot be attributable to the physiological effects of a substance (e.g., drug of abuse or medication).
During the manic period, three or more of the following symptoms are present for most of the day (four if the patient’s mood is only irritable):
A bipolar I diagnosis requires at least one lifetime manic episode.
A person with bipolar I disorder may also have “hypomanic episodes.” Hypomanic episodes have all the symptoms of manic episodes and are associated with an uncharacteristic change in behavior but are not severe enough to cause marked impairment in social or occupational functioning or to require hospitalization. A hypomanic episode lasts for 4 consecutive days or more.
Episodes of major depression are common in bipolar I disorder but are not required for a bipolar I diagnosis. Symptoms of major depression include a depressed mood for most of the day, nearly every day, a loss of interest in pleasure and activities, significant weight loss or weight gain, insomnia or sleeping too much, fatigue, feelings of worthlessness or excessive guilt, diminished ability to think or concentrate, or recurrent thoughts of death or suicide.
The lifetime prevalence of bipolar disorders is thought to be less than 1 percent of the population. However, it can be difficult to estimate because milder forms of bipolar disorder are often not diagnosed.
Mental Health Library Sources:
Information included in all topics of the Mental Health Library comes from the Desk Reference to the Diagnostic Criteria From DSM-5 and Kaplan & Sadock’s Concise Textbook of Clinical Psychiatry. Complete diagnostic and treatment information may be found within these publications.
Information within the Mental Health Library is not intended to be used for self-diagnosis purposes. Rather, it is provided as a public educational service to make people aware of mental health conditions. Please consult a qualified mental health professional for a diagnosis of any suspected mental health illness.
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