Hajdu-Cheney Syndrome
Hanhart Syndrome
Hashimotos Syndrome
Hay-Wells Syndrome
Hemiplegia
Hepatitis
Hepatorenal Syndrome
Hermansky-Pudlak Syndrome
Hodgkin's Disease
Holt-Oram Syndrome
Horner's Syndrome
Hurler-Scheie Syndrome
Hydrocephalus
Hyperadrenalism
Hyperlexia
Hyperplexia(Canadians)
Hyperlipopteinemia (Types I - V)
Hyperprolinemia (Types I and II)
Hypertension
Hypoadrenalism