By Disease

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    Abdominal aortic aneurysm
    Abnormal premenopausal bleeding (increased or irregular)
    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 cystitis
    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 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
    Allergic bronchopulmonary aspergillosis (ABPA)
    Amaurosis fugax
    Amebiasis
    American trypanosomiasis (Chagas' disease)
    Amphetamine or cocaine intoxication
    Amyloidosis
    Anaerobic pneumonia or lung abscess
    Anal fissure
    Anaphylaxis
    Anemia of chronic disease
    Anemia, general approach
    Angina pectoris
    Angular cheilitis
    Ankylosing spondylitis
    Anorectal pain
    Anorexia nervosa
    Anthrax
    Antibiotic-associated colitis
    Anticholinergic poisoning
    Anti-GBM disease
    Anxiety
    Aortic dissection
    Aortic insufficiency
    Aortic stenosis
    Aphthous ulcer
    Aplastic anemia
    Appendicitis
    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
    Asthma
    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
    Bacteremia and sepsis
    Bacterial conjunctivitis
    Bacterial URI
    Baldness (alopecia)
    Bartholin's cyst or abscess
    Basal cell carcinoma
    Behcet's syndrome
    Benign positioning vertigo (BPV)
    Benign prostatic hyperplasia
    Beta blocker overdose
    Biliary obstruction
    Bipolar disorder or mania
    Bitemporal hemianopsia
    Bladder cancer
    Blepharitis
    Blistering diseases (bullae)
    Bone pain and pathologic fractures
    Bone tumors
    Botulism
    Brachial plexus neuropathy
    Bradycardia
    Brain mass in HIV/AIDS
    Breast abscess (mastitis)
    Breast cancer (female)
    Breast cancer (male)
    Breast fibroadenoma
    Bronchiectasis
    Bronchiolitis
    Bronchitis
    Bronchogenic carcinoma (lung cancer)
    Brucellosis
    Budd-Chiari syndrome (hepatic vein obstruction)
    Bulimia nervosa
    Bullous pemphigoid
    Cafe au lait spots
    Campylobacter enteritis
    Cancer
    Cancer of unknown primary
    Carbon monoxide poisoning
    Cardiac tamponade
    Carotid artery aneurysm (cervical)
    Carotid artery dissection
    Carpal tunnel syndrome
    Cataract
    Cat-scratch disease
    Celiac sprue
    Cellulitis
    Cervical cancer
    Cervical lymphadenopathy
    Cervicitis
    Chalazion
    Chancroid
    Chikungunya
    Chlamydia urethritis and cervicitis
    Cholecystitis
    Choledocholithiasis and cholangitis
    Cholelithiasis (gallstones)
    Cholera
    Cholestasis
    Cholinergic poisoning
    Chronic adrenal insufficiency
    Chronic aspiration of gastric contents
    Chronic bacterial prostatitis
    Chronic hepatitis
    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 polyarthritis
    Chronic renal failure
    Chronic sinusitis
    Chronic venous insufficiency
    Chronic visual loss
    Churg-Strauss syndrome
    Chylous ascites
    Cirrhosis
    Clonorchiasis (Chinese liver fluke)
    Clostridial myonecrosis (gas gangrene)
    Coarctation of the aorta
    Coccidioidomycosis
    Coccidiosis or microsporidiosis
    Cold urticaria
    Colorectal cancer
    Common variable immunodeficiency
    Community-acquired pneumonia
    Congestive heart failure
    Congestive heart failure, right-sided
    Conjunctivitis
    Connective tissue disease
    Constrictive pericarditis
    Contact dermatitis (allergic or irritant)
    Cor pulmonale
    Corneal abrasion
    Creutzfeldt-Jakob disease (prion disease)
    Crohn’s disease
    Croup
    Cryoglobulinemia
    Cryptococcosis (cryptococcal meningitis)
    Cushing’s syndrome
    Cutaneous candidiasis
    Cutaneous T cell lymphoma (mycosis fungoides)
    Cystic fibrosis
    Cysticercosis (neurocysticercosis)
    Cytomegalovirus infection
    Decreased anion gap
    Decubitus ulcers
    Deep-vein thrombosis
    Degenerative joint disease (osteoarthritis)
    Dengue
    Depression
    Dermatitis medicamentosa (drug eruption)
    Dermatology, general DDx
    Dermatomyositis
    Diabetes insipidus
    Diabetes mellitus
    Diabetic ketoacidosis
    Diabetic nephropathy
    Diffuse alveolar hemorrhage
    Digitalis overdose
    Diphtheria
    Diplopia or ophthalmoplegia
    Discoid (chronic cutaneous) lupus erythematosus
    Disseminated candidiasis
    Disseminated intravascular coagulation
    Diverticulitis
    Diverticulosis
    Down syndrome
    Dracunculiasis (Guinea worm infection)
    Drooling
    Drowning
    Drug-induced lung disease
    Drug-induced lupus
    Dry eyes (keratoconjunctivitis sicca)
    Dry mouth (xerostomia)
    Dupuytren’s contracture
    Dyshidrotic eczema (pompholyx)
    Dysmenorrhea
    Ear canal diseases
    Echinococcosis (hydatid disease)
    Ectopic pregnancy
    Ehrlichiosis
    Encephalitis
    Endocarditis
    Endometrial cancer
    Endometriosis
    Enterobiasis (pinworm infection)
    Eosinophilic pulmonary syndromes
    Epicondylitis
    Epididymitis
    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)
    Eyelid disorders
    Facial palsy (Bell’s palsy)
    Factitious disorder (Munchausen syndrome)
    Failure to thrive
    Falls and gait disorders
    Fascioliasis (sheep liver fluke)
    Fat necrosis of the breast
    Female hypogonadism
    Female infertility
    Fever in immunocompromised patient
    Fever in parenteral drug user
    Fever of unknown origin
    Fever of unknown origin (FUO) in HIV/AIDS
    Fibrocystic breast disease
    Fibromuscular dysplasia
    Fibromyalgia
    Filariasis
    Fixed drug eruption
    Flatfoot
    Flexor (volar) tenosynovitis
    Focal segmental glomerulosclerosis
    Folic acid deficiency
    Folliculitis
    Foreign body
    Gamma-hydroxybutyrate (GHB) overdose
    Gastric adenocarcinoma
    Gastric tumor
    Gastritis
    Gastroenteritis
    Gastroesophageal reflux disease
    Gastroparesis
    Gaucher disease
    Genital warts (condyloma acuminata)
    Giardiasis
    Glomerulonephritis
    Glomerulonephropathies
    Glossopharyngeal neuralgia
    Glucose-6-phosphate dehydrogenase deficiency
    Goiter
    Gonococcal arthritis
    Gonorrhea
    Gout
    Granuloma inguinale
    Guillain-Barré syndrome
    Hairy cell leukemia
    Hand, foot, and mouth disease
    Hansen's disease (leprosy)
    Hantaviruses
    Hearing loss
    Hemochromatosis
    Hemolytic anemia
    Hemolytic uremic syndrome
    Hemophilia A and B
    Hemorrhoids
    Hemothorax
    Henoch-Schonlein purpura
    Hepatic encephalopathy
    Hepatitis B
    Hepatocellular carcinoma
    Herpes simplex (cold or fever sore; genital herpes)
    Herpes zoster (shingles)
    Hirsutism and virilization
    Histoplasmosis
    HIV
    HIV and AIDS
    HIV-associated nephropathy
    Hodgkin's disease
    Homocystinuria
    Hookworm disease
    Hordeolum (sty)
    Horner's syndrome
    Hospital-acquired pneumonia
    Huntington's disease
    Hydrocele
    Hypercalcemia
    Hypercholesterolemia
    Hypercoagulable state
    Hyperglycemic hyperosmolar state
    Hyperhidrosis
    Hyperkalemia
    Hypermagnesemia
    Hypernatremia
    Hyperparathyroidism
    Hyperphosphatemia
    Hyperprolactinemia
    Hypersensitivity (leukocytoclastic) vasculitis
    Hypersensitivity pneumonitis
    Hypersomnia
    Hypertension
    Hyperthermia
    Hyperthyroidism
    Hypertriglyceridemia
    Hypertrophic obstructive cardiomyopathy (HOCM)
    Hypocalcemia
    Hypocholesterolemia
    Hypokalemia
    Hypomagnesemia
    Hyponatremia
    Hypoparathyroidism
    Hypophosphatemia
    Hypopituitarism
    Hypotension or shock
    Hypothermia
    Hypothermia of extremities
    Hypothyroidism
    Idiopathic pulmonary fibrosis
    Idiopathic thrombocytopenic purpura
    IgA nephropathy (Berger's disease)
    Immobility (especially in elderly)
    Immunodeficiency disorders in adults
    Impetigo
    Infectious mononucleosis (EBV)
    Infective endocarditis
    Inflammatory bowel disease
    Inflammatory bowel disease - associated arthritis
    Influenza
    Insomnia
    Interstitial cystitis
    Interstitial lung disease
    Interstitial nephritis
    Intertrigo
    Intestinal bacterial overgrowth
    Iron poisoning
    Iron-deficiency anemia
    Irritable bowel syndrome
    Ischemic colitis
    Isoniazid (INH) poisoning
    Kaposi's sarcoma
    Kawasaki disease
    Keratitis (corneal ulcer or inflammation)
    Klinefelter syndrome
    Lactase deficiency
    Lactic acidosis
    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 disease, general categories
    Loiasis (Loa loa infection)
    Long QT syndrome
    Lower extremity occlusive disease
    Lower gastrointestinal (GI) bleeding
    Lumbar disk herniation
    Lumbar spinal stenosis
    Lung cancer
    Lung malignancy
    Lupus
    Lyme disease
    Lymphangitis
    Lymphedema
    Lymphogranuloma venereum
    Lymphoma
    Macrocytic anemia
    Malabsorption
    Malaria
    Male hypogonadism
    Male infertility
    Malignancy
    Malignant ascites
    Malignant melanoma
    Malingering
    Mallory-Weiss syndrome
    Marfan syndrome
    Measles (rubeola)
    Megacolon
    Membranous nephropathy
    Ménière’s disease
    Meningitis
    Meniscus tear
    Menopause
    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
    Microangiopathic hemolytic anemia
    Microcytic anemia
    Migraine
    Migratory arthritis
    Miliaria (heat rash)
    Mitral regurgitation
    Mitral stenosis
    Molluscum contagiosum
    Monoclonal gammopathy of uncertain significance (MGUS)
    Mononucleosis
    Mountain sickness
    Mpox (monkeypox)
    Multifocal atrial tachycardia
    Multiple endocrine neoplasia
    Multiple myeloma
    Multiple sclerosis
    Mumps
    Myasthenia gravis
    Mycobacterium avium complex (MAC)
    Mycoplasma
    Myelodysplastic syndromes
    Myelofibrosis
    Myocardial ischemia
    Myositis
    Nail disorders, miscellaneous
    Nasal deformity or saddle nose
    Nasal polyps
    Nasal tumors
    Neck mass
    Nephritic syndrome
    Nephrotic syndrome
    Neurofibromatosis
    Neurogenic arthropathy (Charcot joint)
    Neurogenic bladder
    Nevi
    Nocardiosis
    Nonalcoholic fatty liver disease
    Nonbacterial prostatitis
    Nongenital warts
    Non-Hodgkin's lymphoma
    Normal pressure hydrocephalus
    Normocytic anemia
    Nosocomial fever
    Nummular (discoid) eczema
    Nystagmus
    Obesity
    Obsessive-compulsive disorder
    Obstruction of large intestine
    Obstruction of small intestine
    Obstructive sleep apnea
    Occult gastrointestinal (GI) bleeding
    Occupational pulmonary disease
    Olfactory dysfunction
    Onchocerciasis (river blindness)
    Onycholysis
    Onychomycosis (tinea unguium)
    Open-angle glaucoma
    Opioid dependence and withdrawal
    Opioid overdose
    Optic neuritis
    Oral cancer
    Oral candidiasis (thrush)
    Oral lesions in HIV/AIDS
    Oral lichen planus
    Oral ulcers
    Orbital cellulitis
    Osteomalacia
    Osteomyelitis
    Osteoporosis
    Otitis externa
    Ovarian tumor
    Overlap syndrome (mixed connective tissue disease)
    Paget's disease of bone
    Pancreatic cancer
    Pancreatitis
    Panic disorder
    Papillary necrosis
    Paragonimiasis
    Paraneoplastic syndrome
    Paraneoplastic syndromes
    Parasites involving the lung
    Parasitic infection
    Parasomnias
    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
    Peptic ulcer disease
    Perianal fistula
    Pericardial effusion
    Pericarditis
    Periodic paralysis syndrome
    Peripheral neuropathy (mononeuropathy)
    Peripheral neuropathy (polyneuropathy)
    Peritonitis
    Peritonsillar abscess
    Personality disorder
    Pertussis (whooping cough)
    Pheochromocytoma
    Phobic disorder
    Photodermatitis
    Pituitary mass
    Pityriasis rosea
    Plague
    Plantar fasciitis
    Pleural effusion
    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
    Polymyalgia rheumatica
    Polyps of colon and small intestine
    Porphyria cutanea tarda
    Postmenopausal vaginal bleeding
    Postoperative fever
    Preeclampsia-eclampsia
    Pregnancy
    Premature ovarian failure
    Premenstrual syndrome
    Primary biliary cirrhosis
    Primary dilated cardiomyopathy
    Primary hyperaldosteronism
    Primary sclerosing cholangitis
    Prostate cancer
    Prostatitis
    Prostatodynia
    Protein-energy malnutrition
    Protein-losing enteropathy
    Pseudogout (CPPD) and chondrocalcinosis
    Pseudotumor cerebri
    Psittacosis
    Psoriasis
    Psoriatic arthritis
    Pulmonary alveolar proteinosis
    Pulmonary embolism
    Pulmonary hypertension
    Pulmonary insufficiency
    Pulmonary stenosis
    Pyelonephritis
    Pyoderma gangrenosum
    Q fever
    Rabies
    Radial neuropathy
    Raynaud’s syndrome
    Reactive arthritis (Reiter’s syndrome)
    Rectal prolapse
    Recurrent abortion
    Recurrent pneumonia
    Recurrent respiratory tract infection
    Reflex sympathetic dystrophy
    Relapsing or recurrent fever
    Relapsing polychondritis
    Relative bradycardia
    Renal artery stenosis
    Renal cell carcinoma
    Renal failure in HIV/AIDS
    Renal tubular acidosis
    Respiratory acidosis
    Respiratory alkalosis
    Respiratory syncytial virus
    Restrictive cardiomyopathy
    Retinal artery occlusion
    Retinal detachment
    Retinal vein occlusion
    Retinitis
    Retinopathy
    Rhabdomyolysis
    Rheumatoid arthritis
    Rickettsial diseases
    Rocky Mountain spotted fever
    Rosacea (acne rosacea)
    Rotator cuff disorder
    Rubella (German measles)
    Sacroiliitis
    Salicylate poisoning
    Salivary gland tumor
    Salmonella gastroenteritis
    Sarcoidosis
    Scabies
    Schistosomiasis
    Schizophrenia
    Sciatica
    Scleritis or episcleritis
    Scleroderma (systemic sclerosis)
    Seborrheic dermatitis and dandruff
    Seborrheic keratosis
    Selective IgA deficiency
    Septal perforation
    Septic arthritis (nongonococcal)
    Seronegative spondyloarthropathy
    Serous otitis media
    Sexual dysfunction, men
    Sexual dysfunction, women
    Sexually transmitted disease
    Shigellosis
    SIADH
    Sialadenitis
    Sialolithiasis
    Sick sinus syndrome
    Sickle cell anemia
    Silicosis
    Sinopulmonary syndromes
    Sinus tachycardia
    Sinusitis
    Sjögren’s syndrome
    Small intestinal tumor
    Smallpox
    Somatoform disorder
    Spinal cord compression
    Spontaneous abortion
    Sporotrichosis
    Squamous cell carcinoma
    Streptococcal pharyngitis
    Stress disorder
    Stroke
    Strongyloidiasis
    Subacute bacterial endocarditis
    Subarachnoid hemorrhage
    Sudden death
    Superficial thrombophlebitis
    Superior vena cava syndrome
    Sympatholytic poisoning
    Sympathomimetic poisoning
    Syphilis
    Systemic lupus erythematosus
    Tachycardia
    Takayasu's arteritis (pulseless disease)
    Tapeworms
    Telangiectasia
    Temporal (giant cell) arteritis
    Testicular cancer
    Testicular torsion
    Tetanus
    Thalassemias
    Thoracic aortic aneurysm
    Thoracic outlet syndrome
    Thromboangiitis obliterans (Buerger's disease)
    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)
    Tourette's syndrome
    Toxic shock syndrome
    Toxidromes (poisoning syndromes)
    Toxoplasmosis
    Transient ischemic attack
    Trauma
    Traveler's diarrhea
    Trichinosis (Trichinella infection)
    Trichuriasis (whipworm)
    Tricuspid regurgitation
    Tricuspid stenosis
    Tricyclic antidepressant overdose
    Trigeminal neuralgia
    Tuberculosis
    Tuberculosis of bone and joints
    Tularemia
    Turner syndrome
    Typhoid fever (enteric fever)
    Ulcer and eschar
    Ulcerative colitis
    Ulcers
    Ulnar neuropathy
    Uncontrolled diabetes mellitus
    Upper gastrointestinal (GI) bleeding
    Upper respiratory tract infection (URI)
    URI
    Urinary calculi
    Urinary tract infection
    Uterine leiomyomas (fibroids)
    Uveitis (iritis, cyclitis, choroiditis, retinitis)
    Vaginitis
    Varicella (chickenpox)
    Varicocele
    Varicose veins
    Vasculitis syndromes
    Ventricular septal defect
    Ventricular tachycardia
    Vesicles
    Viral conjunctivitis
    Viral encephalitis
    Viral exanthem
    Viral hepatitis
    Viral URI
    Visceral larva migrans (toxocariasis)
    Vitamin B12 deficiency
    Vitamin K deficiency
    Vitiligo
    Vitreous hemorrhage
    Vocal cord paralysis
    von Willebrand's disease
    Vulvar cancer
    Vulvovaginal candidiasis
    Waldenstrom's macroglobulinemia
    Wegener's granulomatosis
    Wernicke's encephalopathy
    Whipple's disease
    Wilson's disease
    Wrist drop (radial nerve palsy)
    Yellow fever
    Zika
    Zollinger-Ellison syndrome (gastrinoma)