- Pain disorder
- Panic disorder
- Paranoid personality disorder
- Paraphilia
- Parasomnia
- Parent-child relational problem
- Parkinson's Disease
- Partner relational problem
- Pathological gambling
- Perfectionism
- Persecutory delusion
- Personality change due to a general medical condition
- Personality disorder
- Pervasive developmental disorder (PDD)
- Phase of life problem
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- Phencyclidine (or phencyclidine-like)-related disorder
- Phobic disorder
- Phonological disorder
- Physical abuse
- Pica
- Polysubstance-related disorder
- Post-traumatic embitterment disorder (PTED)
- Posttraumatic stress disorder (PTSD)
- Premature ejaculation
- Primary hypersomnia
- Primary insomnia
- Psychogenic amnesia
- Psychological factor affecting medical condition
- Psychotic disorder
- Pyromania
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