- Caffeine-related disorder
- Caffeine-induced sleep disorder
- Cannabis dependence
- Cannabis withdrawal
- Capgras delusion
- Catatonic disorder
- Catatonic schizophrenia
- Childhood amnesia
- Childhood antisocial behavior
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- Circadian rhythm sleep disorder
- Cocaine dependence
- Cocaine intoxication
- Cognitive disorder
- Communication disorder
- Conduct disorder
- Cotard delusion
- Cyclothymia
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