| 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 |
| Hypertension, Pregnancy-Induced |
| Hypertension, Pulmonary |
| Hypertension, Renal |
| Hypertension, Renovascular |
| Hypertensive Encephalopathy |
| Hyperthermia, Induced |
| Hyperthyroidism |
| Hyperthyroxinemia |
| Hyperthyroxinemia, Familial Dysalbuminemic |
| Hypertonic Solutions |
| Hypertrichosis |
| Hypertriglyceridemia |
| Hypertrophy |
| Hypertrophy, Left Ventricular |
| Hypertrophy, Right Ventricular |
| Hyperuricemia |
| Hyperventilation |
| Hypervitaminosis A |
| Hypesthesia |
| Hyphae |
| Hyphema |
| Hyphomicrobiaceae |
| Hyphomicrobium |
| Hypnosis |
| Hypnotics and Sedatives |
| Hypoalbuminemia |
| Hypoaldosteronism |
| Hypobetalipoproteinemia |
| Hypocalcemia |
| Hypocapnia |
| Hypochlorous Acid |
| Hypochondriasis |
| Hypocotyl |
| Hypocrea |
| Hypocreales |
| Hypodermyiasis |
| Hypogastric Plexus |
| Hypoglossal Nerve |
| Hypoglossal Nerve Diseases |
| Hypoglycemia |
| Hypoglycemic Agents |
| Hypoglycins |
| Hypogonadism |
| Hypogravity |
| Hypohidrosis |
| Hypokalemia |
| Hypokalemic Periodic Paralysis |
| Hypokinesia |
| Hypolipoproteinemia |
| Hyponatremia |
| Hypoparathyroidism |
| Hypopharyngeal Neoplasms |
| Hypopharynx |
| Hypophosphatasia |
| Hypophosphatemia |
| Hypophosphatemia, Familial |
| Hypophysectomy |
| Hypophysectomy, Chemical |
| Hypopigmentation |
| Hypopituitarism |
| Hypoplastic Left Heart Syndrome |
| Hypoproteinemia |
| Hypoprothrombinemias |
| Hypospadias |
| Hypotension |
| Hypotension, Orthostatic |
| Hypothalamic Area, Lateral |