Bipolar Disorder


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Definition

Bipolar disorder is a condition in which people go back and forth between periods of a very good or irritable mood and depression. The "mood swings" between mania and depression can be very quick.


Alternative Names

Manic depression; Bipolar affective disorder


Causes, incidence, and risk factors

Bipolar disorder affects men and women equally. It usually starts between ages 15 - 25. The exact cause is unknown, but it occurs more often in relatives of people with bipolar disorder.

Types of bipolar disorder:

  • People with bipolar disorder type I have had at least one manic episode and periods of major depression. In the past, bipolar disorder type I was called manic depression.
  • People with bipolar disorder type II have never had full mania. Instead they experience periods of high energy levels and impulsiveness that are not as extreme as mania (called hypomania). These periods alternate with episodes of depression.
  • A mild form of bipolar disorder called cyclothymia involves less severe mood swings. People with this form alternate between hypomania and mild depression. People with bipolar disorder type II or cyclothymia may be wrongly diagnosed as having depression.

In most people with bipolar disorder, there is no clear cause for the manic or depressive episodes. The following may trigger a manic episode in people with bipolar disorder:

  • Life changes such as childbirth
  • Medications such as antidepressants or steroids
  • Periods of sleeplessness
  • Recreational drug use

References

Beynon S, Soares-Weiser K, Woolacott N, Duffy S, Geddes JR. Pharmacological interventions for the prevention of relapse in bipolar disorder: a systematic review of controlled trials. J Psychopharmacol. 2009; 23(5):574-591.

Schiffer RB. Psychiatric disorders in medical practice. In: Goldman L, Ausiello D, eds. Cecil Medicine. 23rd ed. Philadelphia, Pa:Saunders Elsevier;2007:chap 420.

Benazzi F. Bipolar disorder -- focus on bipolar II disorder and mixed depression. Lancet. 2007;369:935-945.

Morriss RK, Faizal MA, Jones AP, Williamson PR, Bolton C, McCarthy JP. Interventions for helping people recognise early signs of recurrence in bipolar disorder. Cochrane Database Syst Rev. 2007;24;(1):CD004854.

Sachs GS, Nierenberg AA, Calabrese JR, et al. Effectiveness of adjunctive antidepressant treatment for bipolar depression. N Engl J Med. 2007;356:1711-1722.


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Review Date: 3/29/2011
Reviewed By: Fred K. Berger, MD, Addiction and Forensic Psychiatrist, Scripps Memorial Hospital, La Jolla, California. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.
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Last Updated 6/28/2011
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