Table 1
Headache classifications (IHS Headache Classification Committee)
| Category 1 | Migraine |
| Category 2 | Tension-Type Headache |
| Category 3 | Cluster Headache and Chronic Paroxysmal Hemicrania |
| Category 4 | Miscellaneous Headaches Unassociated With Structural Lesion |
| Category 5 | Headache Associated With Head Trauma |
| Category 6 | Headache Associated With Vascular Disorder |
| Category 7 | Headache Associated With Nonvascular Intracranial Disorder |
| Category 8 | Headache Associated With Substances or Their Withdrawal |
| Category 9 | Headache Associated With Noncephilic Infection |
| Category 10 | Headache Associated With Metabolic Disorder |
| Category 11 | Headache or Neck Pain Associated With Disorder of Cranium, Neck, Eyes, Nose, Sinuses, Teeth, Mouth, or Other Facial or Cranial Structures |
| Category 12 | Cranial Neuralgias |
| Category 13 | Headache Not Classifiable |