Bipolar disorder is commonly categorized as either bipolar type I, where an individual experiences full-blown mania, or bipolar type II, in which the hypomanic "highs" do not go to the extremes of mania, and cyclothymic disorder where mood cycles between episodes of hypomania and dysthymia. The latter two are much more difficult to diagnose, since the hypomanic episodes may simply appear as a period of successful high productivity and is reported less frequently than a distressing depression. Psychosis can occur, particularly in manic periods. There are also 'rapid cycling' subtypes. Because there is so much variation in the severity and nature of mood-related problems, the concept of a bipolar spectrum is often employed. There is no consensus as to how many 'types' of bipolar disorder exist. Bipolar disorder can also be classified based on the phase of illness the patient may be in. Many people with bipolar disorder experience severe anxiety and are very irritable (to the point of rage) when in a manic state, while others are euphoric and grandiose.
Bipolar disorder classification
Personality disorder classification
Psychosis classification
Attention-deficit hyperactivity disorder classification
Phobia diagnostic criteria
Anxiety classification
Delirium classification
Bipolar disorder epidemiology and demographics