| Jack-in-the-pulpit poisoning |
| Jacksonian seizure |
| Jacob-Creutzfeldt disease |
| Jacobson’s nerve tumor |
| Jail fever |
| Janimine |
| Jansky-Bielschowsky |
| Jaundice |
| Jaundice – yellow skin |
| Jaundice of the newborn |
| Jaundice-associated conditions |
| Jaw – broken or dislocated |
| Jaw pain and heart attacks |
| Jellyfish stings |
| Jerky body movements |
| Jerusalem cherry poisoning |
| Jet lag prevention |
| Jewelry cleaners |
| Jimsonweed |
| Jitters |
| Job syndrome |
|
| Jock itch |
| Joint dislocation |
| Joint fluid analysis |
| Joint fluid aspiration |
| Joint fluid culture |
| Joint fluid gram stain |
| Joint hypermobility |
| Joint inflammation |
| Joint pain |
| Joint sprain |
| Joint swelling |
| Joint x-ray |
| JRA |
| Junctional epidermolysis bullosa |
| Juvenile angiofibroma |
| Juvenile chronic polyarthritis |
| Juvenile idiopathic arthritis |
| Juvenile onset diabetes |
| Juvenile pernicious anemia |
| Juvenile rheumatoid arthritis |
|
