| Labyrinthitis | 1 quiz |
| Laryngeal Cancer | 1 quiz |
| Laryngitis | 2 quizzes |
| Lazy Eye | 1 quiz |
| Lead Poisoning | 2 quizzes |
| Legionnaires' Disease | 2 quizzes |
| Leishmaniasis | 1 quiz |
| Leukemia | 1 quiz |
| Liver cancer | 2 quizzes |
| Liver metastasis | 2 quizzes |
| Low Back Pain | 5 quizzes |
| Low Blood Pressure | 2 quizzes |
| Low Blood Sugar | 3 quizzes |
| Low neutrophil count | 1 quiz |
| Lung cancer | 1 quiz |
| Lyme disease | 1 quiz |
| Lymphangitis | 2 quizzes |