- Pain
- Pancreatic Neoplasms
- Pancreatitis
- Papilloma
- Paralysis
- Paraproteinemias
- Parapsoriasis
- Parathyroid Diseases
- Parkinsons Disease
- Paronychia
- Pathologic Processes
- Pearson’s Syndrome
- Pediculosis
- Pellagra
- Pemphigoid, Bullous
- Pemphigus
- Penile Induration
- Peptic Ulcer
- Pericarditis
- Periodic Disease
- Periodontal Diseases
- Peroxisomal Disorders
- Phimosis
- Peutz-Jeghers Syndrome
- Peyronie’s Disease
- Phantom Limb
- Pharyngeal Diseases
- Phobic Disorders
- Pigmentation Disorders
- Pilonidal Cyst
- Pituitary Diseases
- Pityriasis
- Placenta Diseases
- Plague
- Pleural Effusion
- Pleurisy
- Pneumonia
- Pneumothorax
- Poisoning
- Poland Syndrome
- Poliomyelitis
- Polychondritis, Relapsing
- Polycystic Ovary Syndrome
- Polycythemia Vera
- Polyendocrinopathies, Autoimmune
- Polymyalgia Rheumatica
- Polymyositis
- Polyneuropathy
- Polyradiculoneuritis
- Porphyria
- Postpoliomyelitis Syndrome
- Prader-Willi Syndrome
- Pre-Eclampsia
- Pregnancy Complications
- Prion Diseases
- Proctitis
- Progeria
- Prognathism
- Prostate Diseases
- Proteus Syndrome
- Prune Belly Syndrome
- Pruritus
- Pseudotumor Cerebri
- Pseudoxanthoma Elasticum
- Psoriasis
- Pterygium
- Puerperal Fever
- Pulmonary Embolism
- Pulmonary Emphysema
- Purpura
- Purpura, Schoenlein-Henoch
- Purpura, Thrombocytopenic
- Pyoderma Gangrenosum
- Pertussis
- Phlebitis
- Primate Diseases
- Presbycusis
- Phenylketonuria
- Pregnancy Outcome
- Pregnancy, Ectopic
- Pharyngitis