Mania
（重定向自Manic disorder）
Mania is a state of abnormally elevated arousal, affect, and energy level, or "a state of heightened overall activation with enhanced affective expression together with lability of affect." Although mania is often conceived as a “mirror image” to depression, the heightened mood can be either euphoric or irritable; indeed, as the mania worsens, irritability often becomes more pronounced and may eventuate in violence.