| HA | Headache | - | Medical(slang) |
| HASHD | Hypertensive ArterioSclerotic Heart Disease | - | Medical(slang) |
| HB | Hemoglobin | - | Medical(slang) |
| HCG | Human Chorionic Gonadotropin | - | Medical(slang) |
| HCO3 | Bicarbonate | - | Medical(slang) |
| HCT | Hematocrit | - | Medical(slang) |
| HD | Hemodialysis | - | Medical(slang) |
| HDL | High Density Lipoprotein | - | Medical(slang) |
| HEENT | Head | - | Medical(slang) |
| HGB | Hemoglobin | - | Medical(slang) |
| HGSIL | High Grade Squamous Intraepithelial Lesion | - | Medical(slang) |
| HIV | Human Immunodeficiency Virus | - | Medical(slang) |
| HPE | H P E | - | Medical(slang) |
| HPV | Human Papiloma Virus | - | Medical(slang) |
| HR | Heart Rate | - | Medical(slang) |
| HRT | Hormone Replacement Therapy | - | Medical(slang) |
| HS | Bedtime | - | Medical(slang) |
| HTN | Gestational Diabetes Mellitus | - | Medical(slang) |
| HX | History | - | Medical(slang) |
