| Diseases & Conditions -- H |
| Hageman Factor Deficiency |
| Hailey-Hailey Disease |
| Haim-Munk Syndrome |
| Hajdu Cheney Syndrome |
| Hallermann Streiff Syndrome |
| Hand-Foot-Mouth Syndrome |
| Hanhart Syndrome |
| Hantavirus Pulmonary Syndrome |
| Hartnup Disease |
| Hay-Wells Syndrome |
| Headache, Cluster |
| Health Tip: What's Ketoacidosis? |
| Hearing Deficits |
| Heart Block, Congenital |
| Heart Defects |
| Heart Transplantation |
| Heartburn |
| Heavy Metal Poisoning |
| Helicobacter pylori |
| Hematuria, Benign, Familial |
| Hemimegalencephaly |
| Hemochromatosis, Hereditary |
| Hemophilia |
| Hemophilia B |
| Hemorrhagic Telangiectasia, Hereditary |
| Henoch-Schonlein Purpura |
| Hepatic Fibrosis, Congenital |
| Hepatitis B |
| Hepatitis C |
| Hepatitis, Neonatal |
| Hepatorenal Syndrome |
| Hereditary Connective Tissue Disorders |
| Hereditary Exostoses, Multiple |
| Hereditary Hyperphosphatasia |
| Hereditary Metabolic Disorders |
| Hermansky Pudlak Syndrome |
| Hernia |
| Herpes, Neonatal |
| Hers Disease |
| Hiccups, Chronic |
| Hidradenitis Suppurativa |
| Hirschsprung's Disease |
| Histidinemia |
| HIV Infection: The Basics |
| Hives and Angioedema |
| Hodgkin's Disease |
| Holoprosencephaly |
| Holt Oram Syndrome |
| Homocystinuria |
| Horner's Syndrome |
| HTLV Type I and Type II |
| Human Granulocytic Ehrlichiosis (HGE) |
| Human HOXA1 Syndromes |
| Human Immunodeficiency Virus (HIV) Infection |
| Human leukocyte antigen test |
| Human Monocytic Ehrlichiosis (HME) |
| Hunter Syndrome |
| Huntington's Disease |
| Hydranencephaly |
| Hydrocephalus |
| Hyper IgD Syndrome |
| Hyper IgE Syndrome, Autosomal Dominant |
| Hyper IgE Syndrome, Autosomal Recessive |
| Hyper IgM Syndrome |
| Hyperbilirubinemia |
| Hyperexplexia |
| Hyperferritinemia Cataract Syndrome |
| Hyperhidrosis, Primary |
| Hyperimmunoglobulinemia E Syndrome |
| Hyperkalemia |
| Hyperlipoproteinemia Type III |
| Hyperlipoproteinemia Type IV |
| Hyperostosis Frontalis Interna |
| Hyperoxaluria, Primary (Type I) |
| Hyperprolinemia Type I |
| Hyperprolinemia Type II |
| Hypertension |
| Hyperthermia |
| Hypertrophic Pyloric Stenosis |
| Hypochondroplasia |
| Hypoglycemia |
| Hypohidrotic Ectodermal Dysplasia |
| Hypokalemia |
| Hypolipoproteinemia |
| Hypomelanosis of Ito |
| Hypoparathyroidism |
| Hypophosphatasia |
| Hypophosphatemia, Familial |
| Hypoplastic Left Heart Syndrome |
| Hypotension, Orthostatic |
| Hypothyroidism |
| Hypotonia, Benign Congenital |