Bipolar II disorder

Bipolar II is the diagnosis most often missed in clients who present with depression. Case questions reward the counselor who asks about past hypomania before accepting a depression label.

Criteria at exam depth. At least one hypomanic episode and at least one major depressive episode, and never a manic episode. A hypomanic episode is at least 4 consecutive days of elevated, expansive, or irritable mood plus increased energy with three or more classic symptoms (four if only irritable) — decreased need for sleep, grandiosity, talkativeness, racing thoughts, distractibility, increased goal-directed activity, risky behavior — that others notice, but without marked impairment, hospitalization, or psychosis. A major depressive episode is 2 weeks with five or more of nine symptoms including depressed mood or anhedonia. The pattern is not better explained by a schizophrenia-spectrum disorder, and the depression or the unpredictability of cycling causes significant distress or impairment.

Specifiers. Current or most recent episode (hypomanic or depressed); severity; remission; with anxious distress, mixed features, rapid cycling (four or more episodes in 12 months), psychotic features (depressive episodes only), melancholic, atypical, catatonia, peripartum onset, seasonal pattern.

Hinge differentials.

• Major depressive disorder: no lifetime hypomanic episode. Clients often don't recognize hypomania as a problem, so ask directly and get collateral.
• Bipolar I: any manic episode (1 week, hospitalization, psychosis, or marked impairment) changes the diagnosis.
• Cyclothymic disorder: symptoms never meet full hypomanic or major depressive criteria.
• Borderline personality disorder: mood shifts last hours, are triggered by interpersonal events, and come with chronic emptiness and abandonment fears; bipolar II has discrete multi-day episodes with decreased need for sleep. Both can co-occur.
• MDD with anxious distress or agitation: restlessness without elevated mood or reduced need for sleep.
• Substance-induced: elevation tied to stimulants or other substances.

On the NCMHCE. Screen for past hypomania before treatment planning for any depression, because antidepressant-only treatment can trigger mood switching. Revise the provisional diagnosis when new history emerges. Suicide risk is serious — depressive episodes dominate the course — so assess and safety plan. Refer for psychiatric evaluation (mood-stabilizer and related classes). Counseling focuses on psychoeducation, mood and sleep tracking, interpersonal and social rhythm therapy, CBT, family involvement, early-warning plans, and treating co-occurring anxiety and substance use.

Clinical Pearl: Hypomanic + major depressive episode, never manic. Bipolar II is not "milder" bipolar I — its depressive burden and suicide risk are substantial.