
| ~1. At least 5 headaches that are severe, unilateral orbital, supraorbital and/or temporal, each lasting 15-180 minutes untreated, with 1 or more of the following occurring on the same side as the pain | |
| Conjunctival injection | Yes No |
| Lacrimation | Yes No |
| Nasal congestion | Yes No |
| Rhinorrhea | Yes No |
| Forehead and facial sweating | Yes No |
| Miosis | Yes No |
| Ptosis | Yes No |
| Eyelid edema | Yes No |
| 2. During a cluster, is the frequency of attacks between 1 every other day to 8 / day | Yes No |

These criteria are that of the International Headache Society, published in 1988.
Cluster Headache Criteria
1. At least 5 headaches that are severe, unilateral orbital, supraorbital and/or temporal, each lasting 15-180 minutes untreated, with 1 or more of the following occurring on the same side as the pain:
2. During a cluster, frequency of attacks between 1 every other day to 8/day
Reference:
Headache classification committee of the International Headache Society. Classification and diagnostic criteria for headache disorders, cranial neuralgias and facial pain. Cephalalgia. 1988;8 Suppl 7:1-96.