Bipolar Disorder Overview: Prevalence, Symptoms, Causes, and Management

Bipolar disorder is a chronic mood disorder characterized by recurrent episodes of mania/hypomania and depression.

Epidemiology

• Lifetime prevalence: ~2.4% (Bipolar I + II); ~1% for Bipolar I alone.
• Equal gender prevalence; women: more rapid cycling, mixed states, depression.
• Onset: typically late teens to mid-20s.

Symptoms

• Mania: Elevated/irritable mood, grandiosity, ↓ sleep, pressured speech, racing thoughts, risky behavior.
• Hypomania: Same but <4 days, no marked impairment/psychosis.
• Depression: Sadness, anhedonia, fatigue, guilt, suicidality.
• Mixed features: Simultaneous manic/depressive symptoms.

Etiology

• Genetic (high heritability, polygenic).
• Neurobiological (monoamines, glutamate, circadian, neuroinflammation).
• Environmental (trauma, stress, substances).

Management

• Mood stabilizers (Li, valproate, lamotrigine) + atypical antipsychotics.
• Psychotherapy (CBT, FFT, IPSRT, psychoeducation).
• Lifestyle: Regular sleep, circadian stability, no substances, stress management.
• Crisis planning, family involvement.

Prognosis

With treatment, most achieve symptomatic remission and functional recovery. Early intervention improves long-term trajectory.