Diagnosaurus
- Hair excess
- Hair loss
- Hairy cell leukemia
- Halitosis
- Hallucinations
- Hand pain
- Hansen's disease
- Hantaviruses
- Hay fever
- HDL decreased
- Headache
- Headache, cough-associated
- Headache, migraine
- Headache and fever
- Headache and nausea
- Hearing acuteness
- Hearing loss
- Heartburn
- Heart failure
- Heart failure, right-sided
- Heart metastases
- Heart sound, fixed split S2
- Heart sound, loud P2
- Heart sound, loud S1
- Heart sound, paradoxically split S2 (or no split)
- Heart sound, S3
- Heart sound, S4
- Heart sound, widely split S2
- Heat rash
- Heel pain
- HELLP syndrome
- Hematemesis
- Hematochezia
- Hematocrit, decreased
- Hematocrit, increased
- Hematuria
- Hematuria and abdominal pain
- Hemochromatosis
- Hemoglobinuria
- Hemolytic anemia
- Hemolytic anemia, microangiopathic
- Hemolytic uremic syndrome
- Hemophilia
- Hemoptysis
- Hemorrhoids
- Hemothorax
- Henoch-Schonlein purpura
- Hepatic encephalopathy
- Hepatic failure, acute
- Hepatic vein obstruction
- Hepatitis, acute
- Hepatitis, alcoholic
- Hepatitis, chronic
- Hepatocellular carcinoma
- Hepatomegaly
- Herniated lumbar disk
- Heroin overdose
- Herpes simplex
- Herpes zoster
- Hiccups
- Hip pain
- Hirsutism
- Histoplasmosis
- HIV & AIDS
- HIV and altered mental status
- HIV and brain mass
- HIV and diarrhea
- HIV and fever
- HIV and FUO
- HIV and oral lesions
- HIV and pulmonary infiltrates
- HIV and renal failure
- HIV and seizure
- HIV-associated nephropathy
- Hives
- Hoarseness
- Hodgkin's disease
- Homocystinuria
- Hookworm disease
- Hordeolum
- Horner's syndrome
- Hospital-acquired pneumonia
- Huntington's disease
- Hydatid disease
- Hydrocele
- Hydrocephalus, normal pressure
- Hyperacusis
- Hyperaldosteronism, primary
- Hypercalcemia
- Hypercholesterolemia
- Hypercoagulable state
- Hypercortisolism
- Hyperglycemia
- Hyperglycemic hyperosmolar state
- Hyperhidrosis
- Hyperkalemia
- Hypermagnesemia
- Hypernatremia
- Hyperosmotic nonketotic coma
- Hyperparathyroidism
- Hyperphosphatemia
- Hyperpigmentation
- Hyperprolactinemia
- Hypersensitivity (leukocytoclastic) vasculitis
- Hypersensitivity pneumonitis
- Hypersomnia
- Hypertension
- Hypertension, pulmonary
- Hypertension, secondary
- Hyperthermia
- Hyperthyroidism
- Hypertriglyceridemia
- Hypertrophic obstructive cardiomyopathy (HOCM)
- Hyperuricemia, endogenous
- Hyperuricemia, foods affecting
- Hyperventilation
- Hypoalbuminemia
- Hypocalcemia
- Hypoglycemia
- Hypogonadism, female
- Hypogonadism, male
- Hypokalemia
- Hypomagnesemia
- Hyponatremia
- Hypoparathyroidism
- Hypophosphatemia
- Hypopigmentation
- Hypopituitarism
- Hypotension
- Hypothermia
- Hypothermia of extremities
- Hypothyroidism
- Hypoventilation, chronic
- Hypoxia and normal CXR