See Conditions by First Letter (P)
- Pachyonychia Congenita
- Paget Disease, Extramammary
- Pain
- Pain, Intractable
- Pain, Postoperative
- Palatopharyngeal Incompetence
- Pallister-Hall Syndrome
- Palmoplantar Keratoderma
- Pancoast Syndrome
- Pancreatic Adenoma
- Pancreatic Cancer
- Pancreatic Carcinoma, Familial
- Pancreatic Cyst
- Pancreatic Diseases
- Pancreatic Fistula
- Pancreatic Islet Cell Tumors
- Pancreatic Neoplasms
- Pancreatic Pseudocyst
- Pancreatitis
- Pancreatitis, Acute Necrotizing
- Pancreatitis, Alcoholic
- Pancreatitis, Chronic
- Pancreatitis, Graft
- Pancytopenia
- PANDAS
- Panic Disorder
- Panniculitis
- Pantothenate Kinase-Associated Neurodegeneration
- Panuveitis
- Papillary Renal Cell Carcinoma
- Papilledema
- Papilloma
- Papilloma, Inverted
- Papillomavirus Infections
- Papillon Lefevre Syndrome
- Papillon-Lefevre Disease
- Paraganglioma
- Paraganglioma, Extra-Adrenal
- Paragangliomas 1
- Parainfluenza Virus Type 3
- Paralyses, Familial Periodic
- Paralysis
- Paralysis, Hyperkalemic Periodic
- Paramyotonia Congenita
- Paramyxoviridae Infections
- Paranasal Sinus Neoplasms
- Paraneoplastic Polyneuropathy
- Paraneoplastic Syndromes
- Paraneoplastic Syndromes, Nervous System
- Paranoid Disorders
- Paraparesis
- Paraparesis, Spastic
- Paraparesis, Tropical Spastic
- Paraphilias
- Paraplegia
- Paraproteinemias
- Parapsoriasis
- Parasitemia
- Parasitic Diseases
- Parasomnias
- Parathyroid Carcinoma
- Parathyroid Diseases
- Parathyroid Neoplasms
- Paratuberculosis
- Paratyphoid Fever
- Paresis
- Paresthesia
- Parkes Weber Syndrome
- Parkinson Disease
- Parkinson Disease, Secondary
- Parkinsonian Disorders
- Parotid Neoplasms
- Parotitis
- Paroxysmal Nocturnal Hemoglobinuria
- Paroxysmal Ventricular Fibrillation
- Pars Planitis
- Parvoviridae Infections
- Passive-Aggressive Personality Disorder
- Patellar Dislocation
- Patellofemoral Pain Syndrome
- Patent Ductus Arteriosus
- Pathological Conditions, Anatomical
- Peanut Hypersensitivity
- Pearson Syndrome
- Pectus Carinatum
- Pediatric Crohns Disease
- Pediatric Multiple Sclerosis
- Pediatric Ulcerative Colitis
- Pedophilia
- Pelizaeus-Merzbacher Disease
- Pelvic Infection
- Pelvic Inflammatory Disease
- Pelvic Neoplasms
- Pelvic Organ Prolapse
- Pelvic Pain
- Pemphigoid, Benign Mucous Membrane
- Pemphigoid, Bullous
- Pemphigus
- Pemphigus Vulgaris
- Pemphigus, Benign Familial
- Penile Induration
- Penile Neoplasms
- Penis Agenesis
- Pentalogy of Cantrell
- Peptic Ulcer
- Peptic Ulcer Hemorrhage
- Peptic Ulcer Perforation
- Perceptual Disorders
- Peri-Implantitis
- Periapical Diseases
- Periapical Periodontitis
- Periarteritis Nodosa
- Periarthritis
- Pericardial Effusion
- Pericarditis
- Pericarditis, Constrictive
- Pericarditis, Tuberculous
- Periodic Fever, Familial, Autosomal Dominant
- Periodontal Attachment Loss
- Periodontal Diseases
- Periodontal Pocket
- Periodontitis
- Peripartum Cardiomyopathy
- Peripheral Arterial Disease
- Peripheral Nervous System Diseases
- Peripheral T-cell Lymphoma
- Peripheral Vascular Diseases
- Periprosthetic Fractures
- Peritoneal Diseases
- Peritoneal Fibrosis
- Peritoneal Neoplasms
- Peritonitis
- Peritonsillar Abscess
- Perivascular Epithelioid Cell Neoplasms
- Periventricular Leukomalacia
- Periventricular Nodular Heterotopia
- Peroneal Neuropathies
- Peroxisomal Disorders
- Peroxisome Biogenesis Disorders
- Persian Gulf Syndrome
- Persistent Fetal Circulation Syndrome
- Persistent Hyperinsulinemia Hypoglycemia of Infancy
- Persistent Truncus Arteriosus
- Persistent Vegetative State
- Personality Disorders
- Peutz-Jeghers Syndrome
- Peyronie Disease
- Pfeiffer Syndrome
- PHACE Syndrome
- Phantom Limb
- Pharyngeal Diseases
- Pharyngeal Neoplasms
- Pharyngitis
- Phenylketonuria, Maternal
- Phenylketonurias
- Pheochromocytoma
- Philadelphia Chromosome
- Phimosis
- Phlebitis
- Phobic Disorders
- Phosphoglycerate Kinase Deficiency
- Phosphorus Metabolism Disorders
- Photophobia
- Photosensitive Epilepsy
- Photosensitivity Disorders
- Phyllodes Tumor
- Pica
- Pick Disease of the Brain
- Pick's Disease
- Picornaviridae Infections
- Piebaldism
- Pierre Robin Sequence
- Pierre Robin Syndrome
- Pigment-dispersion Syndrome
- Pigmentary Retinopathy
- Pigmentation Disorders
- Pigmented Villonodular Synovitis
- Pilocytic Astrocytoma
- Pilomatrixoma
- Pilonidal Sinus
- Pinealoma
- Pineoblastoma
- Pineoblastoma, Childhood
- Pineocytoma
- Piriformis Muscle Syndrome
- Piriformis Syndrome
- Pituitary ACTH Hypersecretion
- Pituitary Diseases
- Pituitary Neoplasms
- Pityriasis
- Pityriasis Rosea
- Pityriasis Rubra Pilaris
- Placenta Accreta
- Placenta Previa
- Placenta, Retained
- Placental Insufficiency
- Plagiocephaly
- Plague
- Plaque, Amyloid
- Plaque, Atherosclerotic
- Plasma Cell Leukemia
- Plasma Thromboplastin Antecedent Deficiency
- Plasmacytoma
- Platelet Storage Pool Deficiency
- Platybasia
- Pleomorphic Malignant Fibrous Histiocytoma
- Pleomorphic Xanthoastrocytoma
- Pleural Diseases
- Pleural Effusion
- Pleural Effusion, Malignant
- Pleural Neoplasms
- Pleurisy
- Pleuropneumonia
- Pleuropulmonary Blastoma
- Pneumococcal Infections
- Pneumoconiosis
- Pneumocystis Infections
- Pneumocystosis
- Pneumonia
- Pneumonia, Aspiration
- Pneumonia, Bacterial
- Pneumonia, Eosinophilic
- Pneumonia, Mycoplasma
- Pneumonia, Pneumococcal
- Pneumonia, Pneumocystis
- Pneumonia, Staphylococcal
- Pneumonia, Ventilator-Associated
- Pneumonia, Viral
- Pneumoperitoneum
- Pneumothorax
- POEMS Syndrome
- Poisoning
- Poliomyelitis
- Polyarteritis Nodosa
- Polyarticular Onset Juvenile Idiopathic Arthritis
- Polychondritis, Relapsing
- Polycystic Kidney Diseases
- Polycystic Kidney, Autosomal Dominant
- Polycystic Kidney, Autosomal Recessive
- Polycystic Liver Disease
- Polycystic Ovary Syndrome
- Polycythemia
- Polycythemia Vera
- Polydactyly
- Polyembryoma
- Polyendocrinopathies, Autoimmune
- Polyhydramnios
- Polymorphic Catecholergic Ventricular Tachycardia
- Polymyalgia Rheumatica
- Polymyositis
- Polyneuropathies
- Polyomavirus Allograft Nephropathy
- Polyomavirus Infections
- Polyps
- Polyradiculoneuropathy
- Polyradiculoneuropathy, Chronic Inflammatory Demyelinating
- Polyuria
- Pontine Glioma
- Porencephaly
- Porokeratosis
- Porokeratosis of Mibelli
- Porphyria Cutanea Tarda
- Porphyria, Acute Intermittent
- Porphyria, Erythropoietic
- Porphyria, Variegate
- Porphyrias
- Porphyrias, Hepatic
- Port-Wine Stain
- Positive-Pressure Respiration, Intrinsic
- Post Polio Syndrome
- Post-Concussion Syndrome
- Post-Dural Puncture Headache
- Post-transplant Lymphoproliferative Disease
- Post-traumatic Epilepsy
- Post-Traumatic Headache
- Postcholecystectomy Syndrome
- Posterior Tibial Tendon Dysfunction
- Posterior Urethral Valves
- Posterior Uveitis
- Postoperative Complications
- Postoperative Hemorrhage
- Postoperative Nausea and Vomiting
- Postpartum Hemorrhage
- Postpartum Thyroiditis
- Postpericardiotomy Syndrome
- Postphlebitic Syndrome
- Postpoliomyelitis Syndrome
- Postthrombotic Syndrome
- Postural Orthostatic Tachycardia Syndrome
- Potassium Deficiency
- Pouchitis
- Poxviridae Infections
- Prader-Willi Syndrome
- Pre-Eclampsia
- Pre-Excitation Syndromes
- Precancerous Conditions
- Precocious Puberty
- Precursor B-Cell Lymphoblastic Leukemia-Lymphoma
- Precursor Cell Lymphoblastic Leukemia-Lymphoma
- Precursor T-Cell Lymphoblastic Leukemia-Lymphoma
- Prediabetic State
- Pregnancy Complications
- Pregnancy Complications, Cardiovascular
- Pregnancy Complications, Infectious
- Pregnancy in Diabetics
- Pregnancy, Ectopic
- Pregnancy, Prolonged
- Pregnancy, Tubal
- Prehypertension
- Preleukemia
- Premature Birth
- Premature Ovarian Failure, Familial
- Premenstrual Syndrome
- Prenatal Exposure Delayed Effects
- Presbycusis
- Presbyopia
- Pressure Ulcer
- Priapism
- Primary Agammaglobulinemia
- Primary Biliary Cirrhosis
- Primary Carnitine Deficiency
- Primary Ciliary Dyskinesia
- Primary Dysautonomias
- Primary Effusion Lymphoma
- Primary Graft Dysfunction
- Primary Hyperoxaluria Type 1
- Primary Lateral Sclerosis
- Primary Myelofibrosis
- Primary Ovarian Insufficiency
- Primary Pigmented Nodular Adrenocortical Disease
- Primary Progressive Aphasia
- Primary Progressive Nonfluent Aphasia
- Primary Sclerosing Cholangitis
- Prinzmetal's Variant Angina
- Prion Diseases
- Proctitis
- Proctocolitis
- Progeria
- Prognathism
- Progressive Hemifacial Atrophy
- Progressive Multifocal Leukoencephalopathy
- Progressive Myoclonic Epilepsy
- Progressive Non-fluent Aphasia
- Progressive Supranuclear Palsy
- Prolactinoma
- Prolactinoma, Familial
- Prolapse
- Propionic Acidemia
- Prostatic Diseases
- Prostatic Hyperplasia
- Prostatic Intraepithelial Neoplasia
- Prostatic Neoplasms
- Prostatitis
- Prosthesis Failure
- Prosthesis-Related Infections
- Protein C Deficiency
- Protein Deficiency
- Protein-Energy Malnutrition
- Protein-Losing Enteropathies
- Proteinuria
- Proteus Infections
- Proteus Syndrome
- Protoporphyria
- Protoporphyria, Erythropoietic
- Protozoan Infections
- Prurigo
- Prurigo Nodularis
- Pruritus
- Pruritus Vulvae
- Pseudarthrosis
- Pseudo-Turner Syndrome
- Pseudocholinesterase Deficiency
- Pseudohypoaldosteronism
- Pseudohypoparathyroidism
- Pseudohypoparathyroidism Type 1A
- Pseudomonas Infections
- Pseudomyotonia
- Pseudomyxoma Peritonei
- Pseudopelade of Brocq
- Pseudophakia
- Pseudopseudohypoparathyroidism
- Pseudotumor Cerebri
- Pseudoxanthoma Elasticum
- Psoriasis
- Psychomotor Agitation
- Psychomotor Disorders
- Psychophysiologic Disorders
- Psychoses, Substance-Induced
- Psychotic Disorders
- Pterygium
- Pterygium of the Conjunctiva and Cornea
- Puberty, Delayed
- Puberty, Precocious
- Pudendal Neuralgia
- Puerperal Disorders
- Puerperal Infection
- Pulmonary Alveolar Proteinosis
- Pulmonary Arteriovenous Malformation
- Pulmonary Aspergillosis
- Pulmonary Atelectasis
- Pulmonary Atresia
- Pulmonary Blastoma
- Pulmonary Disease, Chronic Obstructive
- Pulmonary Edema
- Pulmonary Edema of Mountaineers
- Pulmonary Embolism
- Pulmonary Emphysema
- Pulmonary Eosinophilia
- Pulmonary Fibrosis
- Pulmonary Heart Disease
- Pulmonary Surfactant Protein B, Deficiency of
- Pulmonary Valve Insufficiency
- Pulmonary Valve Stenosis
- Pulmonary Vein Stenosis
- Pulmonary Veno-Occlusive Disease
- Pulmonary Venous Return Anomaly
- Pulmonic Stenosis
- Pulpitis
- Punctate Inner Choroidopathy
- Pupil Disorders
- Pure Autonomic Failure
- Pure Red Cell Aplasia
- Purpura
- Purpura, Schoenlein-Henoch
- Purpura, Thrombocytopenic
- Purpura, Thrombocytopenic, Idiopathic
- Purpura, Thrombotic Thrombocytopenic
- Pyelonephritis
- Pyloric Stenosis
- Pyloric Stenosis, Hypertrophic
- Pyoderma
- Pyoderma Gangrenosum
- Pyridoxine Deficiency
- Pyropoikilocytosis Hereditary
- Pyuria