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Haemangioendothelioma
Hageman Factor Deficiency
Hailey-Hailey Disease
Hairy Cell Leukemia
Hairy Tongue
Hajdu-Cheney Syndrome
Hallervorden-Spatz Disease
Hamman-Rich Disease
Hand-Foot-Mouth Disease (Coxsackie Virus)
Hand-Schuller-Christian Disease
Hanhart Syndrome
Harlequin Type Ichthyosis
Hartnup Disease
Hashimoto's Encephalopathy
Hashimotos Syndrome
Hay-Wells Syndrome
Headache, Chronic
Hearing Disorder
Hearing Impairment
Hearing loss
Heart Aneurysm
Heart Block
Heavy Metal Poisoning
Helminths
Hemangioendothelioma
Hemangioma
Hemifacial Microsomia
Hemihypertrophy
Hemiplegia
Hemoglobinopathy
Hemoglobinuria
Hemolytic Anemia
Hemolytic-Uremic Syndrome
Hemophagocytic Lymphohistiocytosis
Hemophagocytic Reticulosis (or reticulitis)
Hemophilia
Hemophilic Arthropathy
Hemorrhagic Fever
Hemorrhagic Thrombocythemia (Usually known as Essential Thrombocythemia)
Hemosiderosis
Hennoch-Schonlein Purpura
Hepadnovirus D
Hepatic Fibrosis, Congenital
Hepatitis
Hepatitis, Autoimmune Hepatitis
Hepatocellular Carcinoma
Hepatolenticular Degeneration
Hepatorenal Syndrome
Hereditary Amyloidosis
Hereditary Angioedema
Hereditary Angioneurotic Edema
Hereditary Ataxia
Hereditary Carnitine Deficiency
Hereditary Carnitine Deficiency Myopathy
Hereditary Ceroid-Lipofuscinosis
Hereditary Coproporphyria
Hereditary Deafness
Hereditary Ellipotocytosis
Hereditary Frutose Intolerance
Hereditary Hearing Disorder
Hereditary Hearing Loss
Hereditary Hemochromatosis
Hemoglobinuria
Hemophilia
Hereditary Hemorrhagic Telangiectasia
Hereditary Hyperuricemia
Hereditary Neuropathy with Liability of Pressure Palsies
Hermaphroditism, True
Hermansky-Pudlak Syndrome
Hepetic Encephalitis
Herpes, Neonatal
Herpes Viral Encephalitis
Hirschsprungs Disease
Hodgkin's Disease
Holoprosencephaly
Holt-Oram Syndrome
Homocystinuria
Horner's Syndrome
Hughes Syndrome
Hunter's Syndrome
Huntington's Disease
Hurler-Scheie Syndrome
Hydranencephaly
Hydrocephalus
Hydronephrosis with Pecular Facial Expression
Hyperaldosteronism
Hyperadrenalism
Hyperbaric Oxygen Treatment (HBOT)
Hypercholesterolemia
Hyperexplesia
Hyperglycinemia
Hyper-IgM (CD40 Ligand Deficiency)
Hyperinsulinism (Congenital)
Hyperlexia
Hyperplexia(Canadians)
Hyperlipopteinemia (Types I - V)
Hyperostosis_Frontalis_Interna
Hyperprolinemia (Types I and II)
Hypertension
Hyperthyroidism
Hypoadrenalism
Hypoaldosteronism
Hypochondroplasia
Hypoganadism
Hypokalemia
Hypoplastic Left Heart Syndrome Hypotstosterone (Congenital)