| CPTH | chronic post-traumatic headache |
|---|---|
| CTH | ceramide trihexoside; chronic tension headache; cystathionase |
| HA | H antigen; Hakim-Adams [syndrome]; halothane anesthesia; Hartley [guinea pig]; headache; health alli... |
| H/A | head to abdomen; headache |
| HID | headache, insomnia, depression [syndrome]; herniated intervertebral disc; human infectious dose; hyp... |