- Halitosis
- Hallucinations
- Hallux Valgus
- Hamartoma
- Hantavirus Infections
- Hartnup Disease
- Hashimoto’s Disease
- Head and Neck Neoplasms
- Headache
- Heart Defects, Congenital
- Heart Failure, Congestive
- Hemangioma
- Hematoma, Epidural
- Hematoma, Subdural
- Hematuria
- Hemiplegia
- Hemochromatosis
- Hemoglobinopathies
- Hemolytic-Uremic Syndrome
- Hemolytic-Uremic Syndrome
- Hemophilia
- Hemorrhagic Fevers, Viral
- Hemorrhoids
- Hepatitis
- Hepatolenticular Degeneration
- Hermaphroditism
- Hermaphroditism
- Hernia, Hiatal
- Herpes Genitalis
- Herpes Labialis
- Herpes Simplex
- Herpes Zoster
- Herpes Zoster Oticus
- Hiccup
- Hidradenitis Supportiva
- Hippel Lindau Disease
- Hippel-Lindau Disease
- Hirschsprung Disease
- Hirsutism
- Histiocytosis, Sinus
- Histoplasmosis
- Hodgkin’s Disease
- Holoprosencephaly
- Homocystinuria
- Hookworm Infections
- Hordeolum
- Horner’s Syndrome
- Horse Diseases
- Human Endogenous Retrovirus
- Huntington’s Disease
- Hurler’s Syndrome
- Hydrocephalus
- Hydronephrosis
- Hyperacusis
- Hyperaldosteronism
- Hypercalcemia
- Hyperglycemic Hyperosmolar Nonketotic Coma
- Hyperkalemia
- Hyperlipidemia
- Hyperopia
- Hyperoxaluria
- Hypersensitivity
- Hypertension
- Hyperthyroidism
- Hypervitaminosis A
- Hyphema
- Hypoglycemia
- Hypogonadism
- Hypohidrosis
- Hypoplastic Left Heart Syndrome
- Hypospadias
- Hypotension
- Hypothersmia
- Hypothyroidism
- Hypoxia
- Hernia
- Hyperhidrosis