| Hydroxyprostaglandin Dehydrogenases |
| Hydroxypyruvate Reductase |
| Hydroxyquinolines |
| Hydroxysteroid Dehydrogenases |
| Hydroxysteroids |
| Hydroxytestosterones |
| Hydroxytryptophol |
| Hydroxyurea |
| Hydroxyzine |
| Hydrozoa |
| Hygiene |
| Hygromycin B |
| Hylobates |
| Hylobatidae |
| Hymecromone |
| Hymenolepiasis |
| Hymenolepis |
| Hymenolepis diminuta |
| Hymenolepis nana |
| Hymenoptera |
| Hymenostomatida |
| Hyoscyamus |
| Hyperacusis |
| Hyperaldosteronism |
| Hyperalgesia |
| Hyperammonemia |
| Hyperamylasemia |
| Hyperandrogenism |
| Hyperargininemia |
| Hyperbaric Oxygenation |
| Hyperbilirubinemia |
| Hyperbilirubinemia, Hereditary |
| Hyperbilirubinemia, Neonatal |
| Hypercalcemia |
| Hypercapnia |
| Hypercementosis |
| Hypercholesterolemia |
| Hypercholesterolemia, Familial |
| Hyperemesis Gravidarum |
| Hyperemia |
| Hypereosinophilic Syndrome |
| Hyperesthesia |
| Hypergammaglobulinemia |
| Hyperglycemia |
| Hyperglycemic Hyperosmolar Nonketotic Coma |
| Hyperglycinemia, Nonketotic |
| Hypergravity |
| Hyperhidrosis |
| Hyperhomocysteinemia |
| Hypericum |
| Hyperinsulinism |
| Hyperkalemia |
| Hyperkeratosis, Epidermolytic |
| Hyperkinesis |
| Hyperlipidemia |
| Hyperlipidemia, Familial Combined |
| Hyperlipoproteinemia |
| Hyperlipoproteinemia Type III |
| Hyperlipoproteinemia Type IV |
| Hyperlipoproteinemia Type V |
| Hyperlysinemias |
| Hypermedia |
| Hypernatremia |
| Hyperopia |
| Hyperostosis |
| Hyperostosis Frontalis Interna |
| Hyperostosis, Cortical, Congenital |
| Hyperostosis, Diffuse Idiopathic Skeletal |
| Hyperostosis, Sternocostoclavicular |
| Hyperotreti |
| Hyperoxaluria |
| Hyperoxaluria, Primary |
| Hyperoxia |
| Hyperparathyroidism |
| Hyperparathyroidism, Primary |
| Hyperparathyroidism, Secondary |
| Hyperphagia |
| Hyperpigmentation |
| Hyperpituitarism |
| Hyperplasia |
| Hyperprolactinemia |
| Hypersensitivity |
| Hypersensitivity, Delayed |
| Hypersensitivity, Immediate |
| Hypersomnolence, Idiopathic |
| Hypersplenism |
| Hypertelorism |
| Hypertension |
| Hypertension, Malignant |
| Hypertension, Portal |