- Major depressive disorder
- Major depressive episode
- Male erectile disorder
- Malingering
- Manic episode
- Mathematics disorder
- Medication-related disorder
- Melancholia
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- Mental retardation
- Minor depressive disorder
- Misophonia
- Mixed episode
- Mood disorder
- Mood episode
- Morbid jealousy
- Munchausen's syndrome
- Munchausen's syndrome by proxy
- Multiple personality disorder (Dissociative identity disorder)
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