Psychiatric specifier

With rapid cycling

Multiple distinct mood episodes occur within a year, separated by remission or a switch in polarity.

Course and onset

Bipolar I disorderBipolar II disorder

What matters now

Applies toBipolar I disorder · Bipolar II disorder

Deciding signalCount syndromal episodes across time; do not substitute moment-to-moment emotional lability.

Ask thisDoes the longitudinal timeline show repeated distinct episodes rather than rapid shifts within one episode?

Wording outcomeBipolar I disorder, current episode depressed, with rapid cycling

Fit and exclusions

Make the specifier earn its place

Start with the deciding signal, then test chronology, competing explanations, and the effect on diagnostic wording.

When this fits

Distinct depressive, manic, or hypomanic episodes can be identified on a timeline.
Episodes are separated by remission or a clear switch in mood polarity.
Medication, thyroid, substance, sleep, and reproductive factors have been reviewed.

When this may not fit

Mood shifts occur within hours in response to events without distinct syndromal episodes.
A single prolonged mixed, unstable, or substance-related episode is being counted as several episodes.

Focused checks

Patient language

Clinical implication

Use the episode timeline to guide maintenance strategy and reduce destabilising contributors.