All Differential Diagnoses

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    Abdominal aortic aneurysm
    Abdominal pain
    Abdominal pain and fever
    Abdominal pain and hematuria
    Abdominal pain and rash
    Abdominal pain and weight loss
    Abdominal pain in women
    Abdominal pain, generalized
    Abdominal pain, left lower quadrant
    Abdominal pain, left upper quadrant
    Abdominal pain, right lower quadrant
    Abdominal pain, right upper quadrant
    Abdominal pain, upper or epigastric
    Abnormal premenopausal bleeding (increased or irregular)
    Absent or decreased pulse
    Acanthosis nigricans
    Acetaminophen poisoning
    Achalasia
    Acne vulgaris
    Acromegaly and gigantism
    Actinic keratoses
    Actinomycosis
    Acute (angle-closure) glaucoma
    Acute adrenal insufficiency
    Acute bacterial prostatitis
    Acute bronchitis
    Acute cholecystitis
    Acute colonic pseudo-obstruction (Ogilvie's syndrome)
    Acute cough
    Acute cough and fever
    Acute cough and shortness of breath
    Acute cough in hospitalized patient
    Acute cystitis
    Acute diarrhea
    Acute fatty liver of pregnancy
    Acute glaucoma
    Acute hepatic failure
    Acute hepatitis
    Acute intermittent porphyria
    Acute intestinal ischemia
    Acute leukemia
    Acute limb ischemia
    Acute monoarthritis
    Acute myocardial infarction
    Acute myocarditis
    Acute otitis media
    Acute pancreatitis
    Acute paralytic ileus
    Acute pelvic pain
    Acute polyarthritis
    Acute pulmonary edema
    Acute renal failure
    Acute respiratory distress syndrome (ARDS)
    Acute respiratory failure
    Acute rheumatic fever
    Acute sinusitis
    Acute tubular necrosis
    Acute visual loss
    Addison's disease
    Adjustment disorder
    Adrenal insufficiency
    Adrenal mass
    Adult Still's disease
    African trypanosomiasis (sleeping sickness)
    Age-related macular degeneration
    Aggressive behavior
    Alcohol dependence
    Alcohol withdrawal
    Alcoholic hepatitis
    Alcoholism
    Alkaline phosphatase increased
    Allergic bronchopulmonary aspergillosis (ABPA)
    Altered mental status
    Altered mental status and fever
    Altered mental status in a diabetic
    Altered mental status in HIV/AIDS
    Amaurosis fugax
    Amebiasis
    American trypanosomiasis (Chagas' disease)
    Amphetamine or cocaine intoxication
    Amylase increased
    Amyloidosis
    Anaerobic pneumonia or lung abscess
    Anal fissure
    Anaphylaxis
    Anemia of chronic disease
    Anemia, general approach
    Angina pectoris
    Angular cheilitis
    Ankle pain
    Ankylosing spondylitis
    Annular rash
    Anogenital pruritus
    Anorectal pain
    Anorexia (poor appetite)
    Anorexia nervosa
    Anovulation in reproductive years
    Anthrax
    Antibiotic-associated colitis
    Anticholinergic poisoning
    Anti-GBM disease
    Anxiety
    Aortic dissection
    Aortic insufficiency
    Aortic stenosis
    Aphthous ulcer
    Aplastic anemia
    Appendicitis
    Arthritis and fever
    Arthritis and skin nodules
    Arthritis, general DDx
    Arthropods causing skin lesions
    Asbestosis
    Ascariasis
    Ascites (common causes)
    Ascites (expanded list)
    Aspergillosis
    Aspirated foreign body
    Aspiration pneumonia
    Asplenia and infection risk
    AST/ALT increased
    Asthma
    Ataxia
    Atopic dermatitis (eczema)
    Atrial fibrillation
    Atrial flutter
    Atrial myxoma
    Atrial septal defect
    Atrioventricular block (first, second, or third degree)
    Auditory (eustachian) tube dysfunction
    Auricle diseases
    Autoimmune disease
    Autonomic insufficiency
    Avascular necrosis
    Babesiosis
    Back pain and fever
    Bacteremia and sepsis
    Bacterial conjunctivitis
    Bacterial URI
    Baldness (alopecia)
    Bartholin's cyst or abscess
    Basal cell carcinoma
    Behcet's syndrome
    Belching
    Benign positioning vertigo (BPV)
    Benign prostatic hyperplasia
    Beta blocker overdose
    Biliary obstruction
    Bipolar disorder or mania
    Bisferiens carotid pulse
    Bitemporal hemianopsia
    Bladder cancer
    Bleeding, general approach
    Blepharitis
    Blepharospasm (eyelid twitching)
    Blistering diseases (bullae)
    Bone pain and pathologic fractures
    Bone tumors
    Botulism
    Brachial plexus neuropathy
    Bradycardia
    Brain abscess
    Brain mass in HIV/AIDS
    Brain tumors (brain mass)
    Breast abscess (mastitis)
    Breast cancer (female)
    Breast cancer (male)
    Breast fibroadenoma
    Breast lump or mass
    Breast pain
    Bronchial obstruction
    Bronchiectasis
    Bronchiolitis
    Bronchitis
    Bronchogenic carcinoma (lung cancer)
    Brucellosis
    Bruit
    Budd-Chiari syndrome (hepatic vein obstruction)
    Bulimia nervosa
    Bullous pemphigoid
    Cafe au lait spots
    Calf pain
    Campylobacter enteritis
    Cancer
    Cancer of unknown primary
    Cannabis poisoning
    Carbon monoxide poisoning
    Cardiac tamponade
    Cardiac tumors
    Carotid artery aneurysm (cervical)
    Carotid artery dissection
    Carpal tunnel syndrome
    Cataract
    Catatonia or stiffness
    Cat-scratch disease
    Celiac sprue
    Cellulitis
    Cervical (cervix) lesions
    Cervical cancer
    Cervical discharge
    Cervical lymphadenopathy
    Cervicitis
    Chalazion
    Chancroid
    Chemical warfare agents
    Chest pain
    Cheyne-Stokes respiration
    Chikungunya
    Chlamydia urethritis and cervicitis
    Cholecystitis
    Choledocholithiasis and cholangitis
    Cholelithiasis (gallstones)
    Cholera
    Cholestasis
    Cholinergic poisoning
    Chorea
    Chronic adrenal insufficiency
    Chronic aspiration of gastric contents
    Chronic bacterial prostatitis
    Chronic cough
    Chronic cough and fever
    Chronic diarrhea
    Chronic hepatitis
    Chronic hypoventilation
    Chronic intestinal ischemia
    Chronic lymphocytic leukemia
    Chronic monoarthritis
    Chronic myelogenous leukemia
    Chronic obstructive pulmonary disease (COPD)
    Chronic otitis media
    Chronic pain disorder
    Chronic pancreatitis
    Chronic pelvic pain
    Chronic polyarthritis
    Chronic renal failure
    Chronic sinusitis
    Chronic venous insufficiency
    Chronic visual loss
    Churg-Strauss syndrome
    Chylous ascites
    Circumcorneal (ciliary) injection
    Cirrhosis
    Claudication, lower extremity
    Claudication, upper extremity
    Clonorchiasis (Chinese liver fluke)
    Clostridial myonecrosis (gas gangrene)
    Cloudy urine
    Clubbed digits
    Coagulopathy
    Coarctation of the aorta
    Coccidioidomycosis
    Coccidiosis or microsporidiosis
    Coccydynia
    Cold urticaria
    Colorectal cancer
    Coma
    Common variable immunodeficiency
    Community-acquired pneumonia
    Congestive heart failure
    Congestive heart failure, right-sided
    Conjunctivitis
    Connective tissue disease
    Constipation
    Constricted pupil
    Constrictive pericarditis
    Contact dermatitis (allergic or irritant)
    Cor pulmonale
    Corneal abrasion
    Corneal ulcer
    Cough and back pain
    Cough and chest pain
    Cough and fever
    Cough and headache
    Cough headache
    COVID
    Cranial nerve 3 palsy
    Cranial nerve 6 palsy
    Cranial nerve 7 palsy
    Cranial nerve palsy
    Creutzfeldt-Jakob disease (prion disease)
    Crohn’s disease
    Croup
    Cryoglobulinemia
    Cryptococcosis (cryptococcal meningitis)
    Cushing’s syndrome
    Cutaneous candidiasis
    Cutaneous T cell lymphoma (mycosis fungoides)
    Cyanosis
    Cystic fibrosis
    Cysticercosis (neurocysticercosis)
    Cytomegalovirus infection
    Dark urine
    Decreased anion gap
    Decubitus ulcers
    Deep-vein thrombosis
    Degenerative joint disease (osteoarthritis)
    Delayed carotid upstroke
    Delirium
    Dementia
    Dengue
    Depression
    Dermatitis medicamentosa (drug eruption)
    Dermatology, general DDx
    Dermatomyositis
    Dermatophytid reaction
    Desquamative erythema
    Diabetes insipidus
    Diabetes mellitus
    Diabetic ketoacidosis
    Diabetic nephropathy
    Diarrhea in diabetes
    Diarrhea in HIV/AIDS
    Diastolic murmur
    Diffuse alveolar hemorrhage
    Diffusion capacity decreased on pulmonary function tests
    Diffusion capacity increased on pulmonary function tests
    Digitalis overdose
    Dilated pupil
    Diphtheria
    Diplopia or ophthalmoplegia
    Discoid (chronic cutaneous) lupus erythematosus
    Discolored or thick nails
    Disseminated candidiasis
    Disseminated intravascular coagulation
    Distorted nail
    Diverticulitis
    Diverticulosis
    Dizziness
    Down syndrome
    Dracunculiasis (Guinea worm infection)
    Drooling
    Drowning
    Drug side effects
    Drug withdrawal
    Drug-induced lung disease
    Drug-induced lupus
    Dry eyes (keratoconjunctivitis sicca)
    Dry mouth (xerostomia)
    Dupuytren’s contracture
    Dysarthria
    Dysfunctional uterine bleeding
    Dyshidrotic eczema (pompholyx)
    Dysmenorrhea
    Dyspareunia
    Dysphagia
    Dyspnea
    Dystonia
    Dysuria
    Ear canal diseases
    Ear pain
    Ear pain, hearing loss
    Ear pruritus
    Easy bruising
    ECG: electrical alternans
    ECG: left atrial enlargement
    ECG: left axis deviation
    ECG: low voltage
    ECG: right atrial enlargement
    ECG: right axis deviation
    ECG: short QT
    ECG: ST depression or T wave inversion
    ECG: ST elevation
    ECG: U waves
    ECG: wide QRS
    Echinococcosis (hydatid disease)
    Ectopic pregnancy
    Ehrlichiosis
    Elbow pain
    Encephalitis
    Endocarditis
    Endometrial cancer
    Endometriosis
    Enterobiasis (pinworm infection)
    Eosinophilia
    Eosinophilic pulmonary syndromes
    Epicondylitis
    Epididymitis
    Epidural abscess
    Epiglottitis
    Episodic dyspnea
    Epistaxis
    Erectile dysfunction
    Erysipelas (Saint Anthony's fire)
    Erythema multiforme major
    Erythema multiforme minor
    Erythema nodosum
    Erythromelalgia
    Erythroplakia
    Esophageal cancer
    Esophageal candidiasis
    Esophageal motility disorders
    Esophageal stricture
    Esophageal varices
    Esophageal webs
    Esophagitis
    Exfoliative dermatitis (exfoliative erythroderma)
    Eye pain
    Eyelid disorders
    Facial erythema
    Facial palsy (Bell’s palsy)
    Facial, tooth, or jaw pain
    Factitious disorder (Munchausen syndrome)
    Failure to thrive
    Falls and gait disorders
    Fascioliasis (sheep liver fluke)
    Fat necrosis of the breast
    Fatigue
    Fatigue and fever
    Fatigue and weight gain
    Fatigue and weight loss
    Fecal incontinence
    Female hypogonadism
    Female infertility
    Ferritin decreased
    Ferritin increased
    Fever
    Fever and rash
    Fever in immunocompromised patient
    Fever in parenteral drug user
    Fever in returning traveler
    Fever of unknown origin
    Fever of unknown origin (FUO) in HIV/AIDS
    Fibrocystic breast disease
    Fibromuscular dysplasia
    Fibromyalgia
    Figurate (shaped) erythemas
    Filariasis
    Fixed drug eruption
    Fixed split S2
    Flatfoot
    Flatus (flatulence, gas)
    Flexor (volar) tenosynovitis
    Floaters
    Flu-like syndrome
    Focal segmental glomerulosclerosis
    Folic acid deficiency
    Folliculitis
    Foot drop
    Foot pain
    Foreign body
    Furuncles (boils) and carbuncles
    Galactorrhea
    Gamma-hydroxybutyrate (GHB) overdose
    Gastric adenocarcinoma
    Gastric tumor
    Gastritis
    Gastroenteritis
    Gastroesophageal reflux disease
    Gastroparesis
    Gaucher disease
    Generalized lymphadenopathy
    Genital ulcer
    Genital warts (condyloma acuminata)
    Giardiasis
    Gingival hyperplasia
    Glomerulonephritis
    Glomerulonephropathies
    Glossitis
    Glossodynia
    Glossopharyngeal neuralgia
    Glucose-6-phosphate dehydrogenase deficiency
    Glucosuria
    Goiter
    Gonococcal arthritis
    Gonorrhea
    Gout
    Granuloma inguinale
    Groin rash
    Guillain-Barré syndrome
    Gynecomastia
    Hairy cell leukemia
    Halitosis (bad breath)
    Hallucinations
    Hand pain
    Hand, foot, and mouth disease
    Hansen's disease (leprosy)
    Hantaviruses
    Headache
    Headache and fever
    Headache and nausea
    Hearing loss
    Heartburn
    Heel pain
    Hematemesis
    Hematochezia
    Hematuria
    Hemochromatosis
    Hemoglobinuria
    Hemolysis, elevated liver enzymes, and low platelet count (HELLP) syndrome
    Hemolytic anemia
    Hemolytic uremic syndrome
    Hemophilia A and B
    Hemoptysis
    Hemorrhoids
    Hemothorax
    Henoch-Schonlein purpura
    Hepatic encephalopathy
    Hepatitis B
    Hepatocellular carcinoma
    Hepatomegaly
    Herpes simplex (cold or fever sore; genital herpes)
    Herpes zoster (shingles)
    Hiccups (singultus)
    High-density lipoprotein (HDL) decreased
    Hip pain
    Hirsutism and virilization
    Histoplasmosis
    HIV
    HIV and AIDS
    HIV-associated nephropathy
    Hoarseness
    Hodgkin's disease
    Homocystinuria
    Hookworm disease
    Hordeolum (sty)
    Horner's syndrome
    Hospital-acquired pneumonia
    Huntington's disease
    Hydrocele
    Hyperacusis
    Hypercalcemia
    Hypercholesterolemia
    Hypercoagulable state
    Hyperglycemia
    Hyperglycemic hyperosmolar state
    Hyperhidrosis
    Hyperkalemia
    Hypermagnesemia
    Hypernatremia
    Hyperparathyroidism
    Hyperphosphatemia
    Hyperpigmentation
    Hyperprolactinemia
    Hypersensitivity (leukocytoclastic) vasculitis
    Hypersensitivity pneumonitis
    Hypersomnia
    Hypertension
    Hyperthermia
    Hyperthyroidism
    Hypertriglyceridemia
    Hypertrophic obstructive cardiomyopathy (HOCM)
    Hyperuricemia, endogenous
    Hyperventilation
    Hypoalbuminemia
    Hypocalcemia
    Hypocholesterolemia
    Hypoglycemia
    Hypokalemia
    Hypomagnesemia
    Hyponatremia
    Hypoparathyroidism
    Hypophosphatemia
    Hypopigmentation or depigmentation
    Hypopituitarism
    Hypotension or shock
    Hypothermia
    Hypothermia of extremities
    Hypothyroidism
    Hypoxia and normal chest x-ray (CXR)
    Idiopathic pulmonary fibrosis
    Idiopathic thrombocytopenic purpura
    IgA nephropathy (Berger's disease)
    Imbalance
    Immobility (especially in elderly)
    Immunodeficiency disorders in adults
    Impetigo
    Increased BUN with normal GFR
    Increased intracranial pressure (ICP)
    Increased intraocular pressure
    Infectious mononucleosis (EBV)
    Infective endocarditis
    Inflammatory bowel disease
    Inflammatory bowel disease - associated arthritis
    Influenza
    Insomnia
    Interstitial cystitis
    Interstitial lung disease
    Interstitial nephritis
    Intertriginous rash
    Intertrigo
    Intestinal bacterial overgrowth
    Involuntary weight loss
    Iron poisoning
    Iron-deficiency anemia
    Irritable bowel syndrome
    Ischemic colitis
    Isoniazid (INH) poisoning
    Itching and fever
    Jaundice (icterus)
    Jaundice in pregnancy
    Joint effusion by joint fluid type
    Joint pain and fever
    Kaposi's sarcoma
    Kawasaki disease
    Keratitis (corneal ulcer or inflammation)
    Klinefelter syndrome
    Knee effusion
    Knee pain
    Kussmaul's sign
    Lactase deficiency
    Lactic acidosis
    Large kidneys
    Laryngeal tumor
    Laryngitis
    Lead poisoning
    Leg ulcers
    Legionnaire's disease
    Leishmaniasis
    Leptospirosis
    Leukemia
    Leukopenia
    Leukoplakia (oral leukoplakia)
    Lichen planus
    Lichen simplex chronicus
    Livedo reticularis
    Liver abscess
    Liver disease, general categories
    Liver mass
    Loiasis (Loa loa infection)
    Long COVID
    Long QT syndrome
    Loud P2
    Loud S1
    Low back pain
    Low density lipoprotein (LDL) increased
    Lower extremity edema
    Lower extremity occlusive disease
    Lower gastrointestinal (GI) bleeding
    Lower lobe lung disease
    Lumbar disk herniation
    Lumbar spinal stenosis
    Lung cancer
    Lung cavity
    Lung malignancy
    Lupus
    Lyme disease
    Lymphangitis
    Lymphedema
    Lymphocytosis
    Lymphogranuloma venereum
    Lymphoma
    Macrocytic anemia
    Macroglossia
    Malabsorption
    Malar rash
    Malaria
    Male hypogonadism
    Male infertility
    Malignancy
    Malignant ascites
    Malignant melanoma
    Malingering
    Mallory-Weiss syndrome
    Marfan syndrome
    Measles (rubeola)
    Mediastinal mass
    Megacolon
    Melena
    Membranous nephropathy
    Memory loss
    Ménière’s disease
    Meningitis
    Meniscus tear
    Menopause
    Menorrhagia
    Mesothelioma
    Metabolic acidosis, increased anion gap
    Metabolic acidosis, normal anion gap
    Metabolic alkalosis
    Metastases to bone
    Metastases to brain
    Metastases to heart
    Metastases to kidney
    Metastases to liver
    Metastases to lung
    Metastases to meninges
    Metastases to skin
    Metastases to spinal cord
    Metastatic cancer
    Methanol and ethylene glycol poisoning
    Methemoglobinemia
    Microalbuminuria
    Microangiopathic hemolytic anemia
    Microcytic anemia
    Midcycle spotting
    Migraine
    Migratory arthritis
    Miliaria (heat rash)
    Mitral regurgitation
    Mitral stenosis
    Molluscum contagiosum
    Monoclonal gammopathy of uncertain significance (MGUS)
    Mononucleosis
    Morbilliform rash
    Mountain sickness
    Movement disorders
    Mpox (monkeypox)
    Multifocal atrial tachycardia
    Multiple endocrine neoplasia
    Multiple lung cavities
    Multiple myeloma
    Multiple sclerosis
    Mumps
    Muscle cramps or tetany
    Myalgia
    Myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS)
    Myasthenia gravis
    Mycobacterium avium complex (MAC)
    Mycoplasma
    Myelodysplastic syndromes
    Myelofibrosis
    Myocardial ischemia
    Myoclonus
    Myopathy
    Myositis
    Nail disorders, miscellaneous
    Nasal deformity or saddle nose
    Nasal polyps
    Nasal tumors
    Nausea and fever
    Nausea and vomiting
    Neck mass
    Neck pain
    Neck pain and fever
    Neck stiffness
    Nephritic syndrome
    Nephrotic syndrome
    Neurofibromatosis
    Neurogenic arthropathy (Charcot joint)
    Neurogenic bladder
    Neutropenia
    Neutrophilia
    Nevi
    Nipple discharge
    Nipple or areolar lesions
    Nocardiosis
    Nocturia
    Nonalcoholic fatty liver disease
    Nonbacterial prostatitis
    Nongenital warts
    Non-Hodgkin's lymphoma
    Nonpalpable purpura
    Normal pressure hydrocephalus
    Normocytic anemia
    Nosocomial fever
    Nummular (discoid) eczema
    Nystagmus
    Obesity
    Obsessive-compulsive disorder
    Obstruction of large intestine
    Obstruction of small intestine
    Obstructive disease on PFTs
    Obstructive sleep apnea
    Obstructive voiding symptoms
    Occult gastrointestinal (GI) bleeding
    Occupational pulmonary disease
    Odynophagia
    Olfactory dysfunction
    Oligomenorrhea and amenorrhea
    Onchocerciasis (river blindness)
    Onycholysis
    Onychomycosis (tinea unguium)
    Open-angle glaucoma
    Opioid dependence and withdrawal
    Opioid overdose
    Optic disc swelling
    Optic neuritis
    Oral cancer
    Oral candidiasis (thrush)
    Oral lesions in HIV/AIDS
    Oral lichen planus
    Oral ulcers
    Orbital cellulitis
    Orthopnea or nocturnal dyspnea
    Osmolar gap
    Osteomalacia
    Osteomyelitis
    Osteoporosis
    Otitis externa
    Ovarian tumor
    Overlap syndrome (mixed connective tissue disease)
    Paget's disease of bone
    Palms and soles rash
    Palpable purpura
    Palpitations
    Pancreatic cancer
    Pancreatitis
    Pancytopenia
    Panic disorder
    Papillary necrosis
    Papilledema
    Papules and nodules
    Paradoxically split S2 (or no split)
    Paragonimiasis
    Paraneoplastic syndrome
    Paraneoplastic syndromes
    Parasites involving the lung
    Parasitic infection
    Parasomnias
    Parasternal lift
    Paresthesias
    Paresthesias and weight loss
    Parkinsonism
    Paronychia
    Paroxysmal supraventricular tachycardia
    Parvovirus infection (erythema infectiosum)
    Patellofemoral syndrome
    Patent ductus arteriosus
    Pauci-immune glomerulonephritis (ANCA+)
    Pediculosis (lice)
    Pelvic inflammatory disease
    Pelvic mass
    Pemphigus vulgaris
    Penile pain
    Penile papules and other lesions
    Penile ulcer
    Peptic ulcer disease
    Perianal fistula
    Pericardial effusion
    Pericarditis
    Periodic paralysis syndrome
    Periorbital edema or swelling
    Peripheral neuropathy (mononeuropathy)
    Peripheral neuropathy (polyneuropathy)
    Peripheral neuropathy and fever
    Peripheral neuropathy and weight loss
    Peritonitis
    Peritonsillar abscess
    Personality disorder
    Pertussis (whooping cough)
    Petechiae
    Pharyngitis
    Pheochromocytoma
    Phobic disorder
    Photodermatitis
    Photophobia
    Pigmented lesions
    Pituitary mass
    Pityriasis rosea
    Plague
    Plantar fasciitis
    Platypnea
    Pleural effusion
    Pleural effusion and fever
    Pleural plaques (masses or thickening)
    Pleuritic chest pain
    Pleuritis (pleurisy)
    Pneumaturia
    Pneumococcal pneumonia
    Pneumoconiosis
    Pneumocystis pneumonia (PCP)
    Pneumonia
    Pneumothorax
    Podagra
    Poliomyelitis
    Polyarteritis nodosa
    Polyarteritis nodosa and microscopic polyangiitis
    Polycystic kidney disease
    Polycystic ovary syndrome
    Polycythemia
    Polycythemia vera
    Polydipsia
    Polymyalgia rheumatica
    Polyps of colon and small intestine
    Polyuria
    Porphyria cutanea tarda
    Portal hypertension
    Postcholecystectomy pain
    Postmenopausal vaginal bleeding
    Postoperative fever
    Postpartum fever
    Preeclampsia-eclampsia
    Pregnancy
    Premature ovarian failure
    Premenstrual syndrome
    Primary amenorrhea
    Primary biliary cirrhosis
    Primary dilated cardiomyopathy
    Primary hyperaldosteronism
    Primary sclerosing cholangitis
    Proptosis (exophthalmos)
    Prostate cancer
    Prostatitis
    Prostatodynia
    Protein-energy malnutrition
    Protein-losing enteropathy
    Proteinuria
    Pruritus (itching)
    Pseudogout (CPPD) and chondrocalcinosis
    Pseudotumor cerebri
    Psittacosis
    Psoriasis
    Psoriatic arthritis
    PT increased
    Ptosis
    PTT increased
    Pulmonary alveolar proteinosis
    Pulmonary embolism
    Pulmonary hypertension
    Pulmonary infiltrates in immunocompromised patient
    Pulmonary insufficiency
    Pulmonary nodules (multiple)
    Pulmonary stenosis
    Pulmonary-renal syndromes
    Pulseless electrical activity (PEA)
    Pulsus alternans
    Pulsus paradoxus
    Purine content of foods
    Pustules
    Pyelonephritis
    Pyoderma gangrenosum
    Pyuria
    Q fever
    Qualitative platelet disorders
    Rabies
    Radial neuropathy
    Raynaud’s syndrome
    Reactive arthritis (Reiter’s syndrome)
    Rectal prolapse
    Recurrent abortion
    Recurrent pneumonia
    Recurrent respiratory tract infection
    Red eye
    Red eye and eye pain
    Reflex sympathetic dystrophy
    Reflexes, delayed relaxation
    Relapsing or recurrent fever
    Relapsing polychondritis
    Relative bradycardia
    Renal artery stenosis
    Renal cell carcinoma
    Renal cysts
    Renal failure in HIV/AIDS
    Renal tubular acidosis
    Respiratory acidosis
    Respiratory alkalosis
    Respiratory syncytial virus
    Restrictive cardiomyopathy
    Restrictive disease on PFTs
    Retinal artery occlusion
    Retinal detachment
    Retinal vein occlusion
    Retinitis
    Retinopathy
    Rhabdomyolysis
    Rheumatoid arthritis
    Rhinitis (nasal congestion)
    Rickettsial diseases
    Rocky Mountain spotted fever
    Rosacea (acne rosacea)
    Rotator cuff disorder
    Rubella (German measles)
    S3
    S4
    Sacroiliitis
    Salicylate poisoning
    Salivary gland tumor
    Salmonella gastroenteritis
    Sarcoidosis
    Scabies
    Scaly lesions
    Schistosomiasis
    Schizophrenia
    Sciatica
    Scleritis or episcleritis
    Scleroderma (systemic sclerosis)
    Scrotal rash
    Seborrheic dermatitis and dandruff
    Seborrheic keratosis
    Seizure
    Seizure in HIV/AIDS
    Selective IgA deficiency
    Septal perforation
    Septic arthritis (nongonococcal)
    Seronegative spondyloarthropathy
    Serous otitis media
    Sexual dysfunction, men
    Sexual dysfunction, women
    Sexually transmitted disease
    Shigellosis
    Shortness of breath and fever
    Shoulder pain
    Shunt (right to left, anatomic shunts)
    SIADH
    Sialadenitis
    Sialolithiasis
    Sick sinus syndrome
    Sickle cell anemia
    Silicosis
    Sinopulmonary syndromes
    Sinus tachycardia
    Sinusitis
    Sjögren’s syndrome
    Small intestinal tumor
    Smallpox
    Sneezing
    Solitary pulmonary nodule
    Somatoform disorder
    Sore throat and rash
    Spasticity
    Spells (nonspecific)
    Spinal cord compression
    Spinal cord tumor
    Splenomegaly
    Splinter hemorrhages
    Spontaneous abortion
    Sporotrichosis
    Squamous cell carcinoma
    Streptococcal pharyngitis
    Stress disorder
    Stridor
    Stroke
    Strongyloidiasis
    Subacute bacterial endocarditis
    Subarachnoid hemorrhage
    Subcutaneous nodules
    Sudden death
    Superficial thrombophlebitis
    Superior vena cava syndrome
    Sympatholytic poisoning
    Sympathomimetic poisoning
    Syncope
    Syphilis
    Systemic lupus erythematosus
    Systolic murmur
    Tachycardia
    Takayasu's arteritis (pulseless disease)
    Tapeworms
    Telangiectasia
    Temporal (giant cell) arteritis
    Testicular cancer
    Testicular mass or swelling
    Testicular pain (scrotal pain, groin pain)
    Testicular torsion
    Tetanus
    Thalassemias
    Third-trimester vaginal bleeding
    Thoracic aortic aneurysm
    Thoracic outlet syndrome
    Thromboangiitis obliterans (Buerger's disease)
    Thrombocytopenia
    Thrombocytosis
    Thrombotic thrombocytopenic purpura
    Thyroid cancer
    Thyroid nodules
    Thyroiditis
    Tinea corporis (body ringworm)
    Tinea cruris (jock itch)
    Tinea pedis and tinea manuum
    Tinea versicolor (pityriasis versicolor)
    Tinnitus
    Tourette's syndrome
    Toxic shock syndrome
    Toxidromes (poisoning syndromes)
    Toxoplasmosis
    Tracheal obstruction
    Transient ischemic attack
    Trauma
    Traveler's diarrhea
    Tremor
    Trichinosis (Trichinella infection)
    Trichuriasis (whipworm)
    Tricuspid regurgitation
    Tricuspid stenosis
    Tricyclic antidepressant overdose
    Trigeminal neuralgia
    TSH decreased
    TSH increased
    Tuberculosis
    Tuberculosis of bone and joints
    Tularemia
    Turner syndrome
    Typhoid fever (enteric fever)
    Ulcer and eschar
    Ulcerative colitis
    Ulcers
    Ulnar neuropathy
    Uncontrolled diabetes mellitus
    Unilateral edema
    Upper airway obstruction
    Upper back pain
    Upper extremity edema
    Upper gastrointestinal (GI) bleeding
    Upper lobe lung disease
    Upper respiratory tract infection (URI)
    Urethral discharge, men
    Urethral discharge, women
    URI
    Urinary calculi
    Urinary frequency
    Urinary incontinence
    Urinary problems
    Urinary tract infection
    Urinary tract obstruction
    Urinary urgency
    Urticaria (hives) and angioedema
    Uterine leiomyomas (fibroids)
    Uveitis (iritis, cyclitis, choroiditis, retinitis)
    Vaginal bleeding
    Vaginal discharge
    Vaginitis
    Varicella (chickenpox)
    Varicocele
    Varicose veins
    Vasculitis syndromes
    Ventricular septal defect
    Ventricular tachycardia
    Vertigo
    Vesicles
    Vesicles and fever
    Viral conjunctivitis
    Viral encephalitis
    Viral exanthem
    Viral hepatitis
    Viral URI
    Visceral larva migrans (toxocariasis)
    Visual loss and eye pain
    Vitamin B12 deficiency
    Vitamin K deficiency
    Vitiligo
    Vitreous hemorrhage
    Vocal cord paralysis
    von Willebrand's disease
    Vulvar cancer
    Vulvar lesions
    Vulvovaginal candidiasis
    Waldenstrom's macroglobulinemia
    Weakness
    Weakness, proximal muscle
    Weeping or encrusted lesions
    Wegener's granulomatosis
    Weight loss and back pain
    Weight loss and fever
    Wernicke's encephalopathy
    Wheezing
    Whipple's disease
    Wide pulse pressure
    Widely split S2
    Wilson's disease
    Wrist drop (radial nerve palsy)
    Wrist pain
    Yellow fever
    Zika
    Zollinger-Ellison syndrome (gastrinoma)