Washington Manual of Medical Therapeutics
- Habitual loud snoring
- Haemophilus, Aggregatibacter, Cardiobacterium, Eikenella, and Kingella (HACEK) species
- Hairy cell leukemia
- Haloperidol
- Harris-Benedict equation
- Hashimoto disease
- Hashimoto thyroiditis
- Headache
- Head and neck cancer
- Head and neck squamous cell cancer (HNSCC)
- Head trauma
- Health care-associated meningitis
- Heartburn
- Heart failure with preserved ejection fraction (HFpEF)
- Heart failure with reduced ejection fraction (HFrEF)
- Heartland virus disease
- Heart-lung transplantation
- Heart transplant recipients
- Heated humidified high-flow nasal cannula (HFNC)
- Heated nasogastric/bladder lavage
- Heated oxygen, hypothermia
- Heated peritoneal lavage
- Heat exhaustion
- Heat-induced illness
- Heat stroke
- Heat syncope
- Heavy chain deposition disease (HCDD)
- Helicobacter pylori
- Helium-oxygen mixture (Heliox)
- Heller myotomy
- Hematochezia
- Hematologic disorders
- Hematologic malignancies
- Hematopoietic stem cell transplantation
- Hematuria
- Hemicraniectomy
- Hemodynamic measurements
- Hemoglobin A1C
- Hemolysis
- Hemolysis, elevated liver enzymes, low platelets (HELLP) syndrome
- Hemophilia A
- Hemophilia B
- Hemorrhagic adrenal infarction
- Hemorrhagic stroke
- Hemostatic disorders
- Hemothorax
- Henderson-Hasselbalch equation
- Henoch-Schönlein purpura
- Heparin-induced platelet activation (HIPA)
- Hepatic encephalopathy
- Hepatic steatosis
- Hepatic vein thrombosis (HVT)
- Hepatic venous pressure gradient (HVPG)
- Hepatobiliary infections
- Hepatocellular injury
- Hepatorenal syndrome (HRS)
- Heptavalent (A, B, C, D, E, F, G) antitoxin
- Hereditary angioedema
- Hereditary hemochromatosis (HH)
- Hereditary pancreatitis
- Herniation
- High-resolution computed tomography (HRCT)
- High-resolution manometry (HRM)
- Histoplasma capsulatum infections
- Histoplasma capsulatum varcapsulatum
- Histoplasmosis
- HIV entry inhibitors
- HIV reverse transcriptase
- HLA-B27 test
- HMG-CoA reductase inhibitors
- Hodgkin lymphoma (HL)
- Homocysteine (HC)
- Homocystinuria
- Hormone excess
- Hospital-acquired pneumonia (HAP)
- Hospital diets
- 24-Hour urine cortisol test
- Human bites
- Human granulocytic anaplasmosis (HGA)
- Human monocytic ehrlichiosis (HME)
- Human tetanus immunoglobulin
- Hybrid closed loop (HCL) systems
- Hydrocortisone
- Hydroflumethiazide [table]
- Hydrofluoroalkane (HFA)
- Hydrops fetalis
- Hydroxocobalamin
- 3-Hydroxy-3-methylglutaryl-coenzyme A (HMG-CoA) reductase inhibitors
- Hydroxy iminodiacetic acid (HIDA) scan
- 25-Hydroxy vitamin D (25(OH)D)
- Hyperaldosteronism
- Hypercalcemia
- Hypercholesterolemia [table]
- Hypercoagulable states
- Hypercontractile disorder
- Hypereosinophilic syndrome (HES)
- Hyper-IgE syndrome
- Hyper-IgM syndrome
- Hyperleukocytosis with leukostasis [table]
- Hypermagnesemia
- Hypernatremia
- Hyperosmolality
- Hyperosmolar hyponatremia
- Hyperprolactinemia
- Hypersensitivity pneumonitis (HP)
- Hypersomnolence
- Hypertensive crisis
- Hypertensive emergency
- Hypertensive encephalopathy
- Hyperthermia
- Hypertonic saline
- Hypertrophic cardiomyopathy (HCM)
- Hyperuricemia
- Hyperviscosity syndrome
- Hypervolemic hyponatremia
- Hypocalcemia
- Hypocaloric feeding
- Hypokalemic periodic paralysis
- Hyponatremia
- Hypopituitarism
- Hypopnea
- Hypotension
- Hypothalamic disorders
- Hypothalamic dysfunction, heat stroke
- Hypothermia
- Hypoventilation
- Hypovolemic hypernatremia
- Hypovolemic hyponatremia
- Hypovolemic shock
- Hypoxemic respiratory failure
- Hypoxia, sickle cell disease
- H₂ receptor antagonists