- Polymyositis
- Poor colour vision
- Popliteal artery aneurysm
- Post-concussion syndrome
- Post-traumatic stress disorder (PTSD)
- Posterior cortical atrophy
- Posterior cruciate ligament injury
- Posterior prolapse (Rectocele)
- Postherpetic neuralgia
- Pouchitis
- Prediabetes
- Prehypertension
- Premature ovarian failure
- Premature ventricular contractions
- Premature ventricular contractions
- Premenstrual syndrome (PMS)
- Presbyopia
- Primary aldosteronism
- Primary biliary cirrhosis
- Primary immunodeficiency
