bipolar disorder

This term is a clinical diagnosis used in psychiatric and medical contexts. While it is frequently used in casual conversation to describe someone with volatile emotions, such usage is often considered imprecise or stigmatizing, as the clinical condition involves distinct, prolonged episodes of mania and depression rather than simple moodiness.

In a medical setting, the term is typically paired with specific types, such as Bipolar I or Bipolar II, to denote the severity and nature of the manic episodes. It is treated as a singular medical entity and is rarely used in the plural unless referring to different types of the disorder across a population.