Bipolar Disorder

Accurate diagnosis starts with distinguishing bipolar I from bipolar II: bipolar I requires at least one manic episode of sufficient severity and duration to warrant clinical attention, while bipolar II involves hypomanic episodes alongside major depressive episodes. Mixed features—simultaneous manic and depressive symptoms—occur in up to half of cases and increase suicide risk. Misdiagnosis as unipolar depression is common, especially when mania is subtle or reported only by others.

Rapid cycling—recurrent mood episodes within a year—signals higher illness burden and may be associated with factors such as thyroid dysfunction, antidepressant use without mood stabilization, or substance use. It responds poorly to standard antidepressants alone and may need mood stabilizers like lamotrigine or valproate. Clinicians should rule out medical mimics (e.g., hyperthyroidism, neurologic disorders) before labeling rapid cycling.

Red flags for misdiagnosis include late-onset depression after age 40, treatment-emergent mania/hypomania on antidepressants, or inconsistent response to SSRIs. A detailed psychiatric history with collateral from family or partners improves accuracy. If diagnostic uncertainty persists beyond 6 months, referral to a mood disorder specialist is warranted before committing to long-term treatment plans.