| Name | Description |
|---|---|
| Guinea worm | Avery slender worm infecting human beings through drinking contaminated water; it gradually works its way into subcutaneous tissues. |
| Gum | The muscles (dense fibrous tissue) that surrounds the teeth. |
| Haematemesis | Vomiting of blood. |
| Haematuria | Any condition in which the urine contains blood or red blood cells. |
| Haemoptysis | spitting of blood. |
| Hallucination | A subjective perception of what does not exist. |
| Hallucinogen | a substance producing visions, illusions, etc. |
| Headache | A diffuse pain in various parts of the head. |
| Heart burn | A burning feeling in the regions of the chest and stomach, generally due to indigestion. |
| Hemicrania | Migraine. |
