Bipolar Disorder
Bipolar disorders are episodic conditions characterized by at least one episode of mania (extreme highs) or hypomania (moderate highs). The large majority of people who experience manic episodes also experience recurrent episodes of major depression. Others experience dysthymia.
Cycling between the poles of high–high (mania) and low–low (depression) is the very essence of the diagnosis of bipolar disorder, which contrasts with major and mild-to-moderate depression -- disorders characterized by lows without intervening manic highs (hence the name unipolar depression used sometimes for depression).
To be diagnosed as having a manic episode, a person must experience manic symptoms -- feeling unusually high, euphoric, elevated, or expansive -- for at least one week and also experience three or more of the following symptoms:
- inflated self-esteem and grandiosity
- marked decrease in the need for sleep
- talkative with rapid, pressured speech
- flight of ideas (rapidly racing thoughts)
- distractibility
- increase in goal-directed activity
- excessive involvement in pleasurable activity with a high risk of painful consequences (buying sprees, sexual indiscretions, or foolish investments)
Three types of bipolar disorder are distinguished based on the degree of cycling:
Bipolar I disorder involves one or more manic episodes along with multiple major depression episodes. Thus, cycling is the most extreme, ranging from high–high to low–low.
Bipolar II disorder involves hypomanic (medium–high) episodes cycling with multiple major depression episodes. Cycling is between medium–high and low–low.
Cyclothymia involves multiple episodes of hypomania cycling with multiple episodes of mild-to-moderate depression (dysthymia). Cycling is between medium–high and medium–low.
