What is a key requirement for diagnosing Bipolar I Disorder?

For a diagnosis of Bipolar I Disorder, the essential requirement is the experience of at least one manic episode. This manic episode represents a significant departure from the individual’s baseline functioning, characterized by elevated mood, increased energy, or heightened irritability, lasting for at least one week (or any duration if hospitalization is necessary). This aspect is crucial as it distinguishes Bipolar I Disorder from other mood disorders, where manic episodes are a defining feature.

The presence of chronic depression is not a requirement for the diagnosis, as individuals may experience depressive episodes, but it is not mandatory for the diagnosis of Bipolar I Disorder. Similarly, while some individuals with Bipolar I Disorder might experience psychotic features during manic episodes, these features are not an exclusion criterion for the diagnosis. Lastly, experiencing hypomanic episodes alone does not qualify for Bipolar I Disorder; hypomania is associated with Bipolar II Disorder, making it clear why the experience of a full manic episode is vital for the Bipolar I diagnosis.