hand foot and mouth disease

hay fever

head and neck cancer

head injury

hearing loss

heart arrhythmia

heart arrhythmias

heart attack

heart disease

heart failure

heart muscle disease

heart rhythm disorder

hemolytic uremic syndrome

hemophilia

hemorrhage

hemorrhagic fever

hepatitis b

hepatitis c

hepatocellular carcinoma

hereditary optic neuropathy

herpes infections

high blood pressure

high functioning autism

hip fractures

hiv

hiv infection

holoprosencephaly

hsv 2

human african trypanosomiasis

human immunodeficiency virus

human papilloma virus

huntington disease

huntington's disease

hutchinson gilford progeria syndrome

hyperthyroidism

hypoglycemia

hypoplastic left heart syndrome

hypothermia

hypoxia