The Rare Disease Database

The most comprehensive source of rare disease information.

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Top 10 rare psychiatric diseases

Measured by: prevalence

Disease Estimated US prevalenceAge of onset
Rumination disorders176,000-350,000
Factitious disorders150,000-332,000
Narcolepsy146,000-200,000
135,000-200,000
Cyclothymic disorder132,000-260,000
Idiopathic hypersomnia104,280-130,000
Conversion Disorder36,300-500,000
Diogenes syndrome36,000-60,000
Tardive dyskinesia21,000–30,000
Capgras syndrome16,000-36,000