Hypomania: A condition similar to mania but less severe. The symptoms are similar with elevated mood, increased activity, decreased need for sleep, grandiosity, racing thoughts, and the like. However, hypomanic episodes differ in that they do not cause significant distress or impair one's work, family, or social life in an obvious way while manic episodes do.

Hypomanic people tend to be unusually cheerful, have more than ample energy, and need little sleep. Hypomania is a pleasurable state. It may confer a heightened sense of creativity and power. However, hypomania can subtly impair a person's judgment. Too much confidence can conceal the consequences of decisions.

Hypomania can be difficult to diagnose because it may masquerade as mere happiness. It is important to diagnose hypomania because, as an expression of bipolar disorder, it can cycle into depression and carry an increased risk of suicide.