Version May 2024
| Cluster headache: Diagnostic criteria for cluster headache require the following: |
| A. At least five attacks fulfilling criteria B through D |
| B. Severe or very severe unilateral orbital, supraorbital, and/or temporal pain lasting 15 to 180 minutes when untreated; during part (but less than half) of the active time course of cluster headache, attacks may be less severe and/or of shorter or longer duration |
| C. Either or both of the following: |
| 1. At least one of the following symptoms or signs ipsilateral to the headache: |
| a) Conjunctival injection and/or lacrimation |
| b) Nasal congestion and/or rhinorrhea |
| c) Eyelid edema |
| d) Forehead and facial sweating |
| e) Miosis and/or ptosis |
| 2. A sense of restlessness or agitation |
| D. Attacks have a frequency between one every other day and eight per day; during part (but less than half) of the active time-course of cluster headache, attacks may be less frequent |
| E. Not better accounted for by another ICHD-3 diagnosis |
| Episodic cluster headache: Diagnostic criteria for episodic cluster headache require the following: |
| A. Attacks fulfilling criteria for cluster headache and occurring in bouts (cluster periods) |
| B. At least two cluster periods lasting from seven days to one year (when untreated) and separated by pain-free remission periods of three months or more |
| Chronic cluster headache: Diagnostic criteria for chronic cluster headache require the following: |
| A. Attacks fulfilling criteria for cluster headache |
| B. Attacks occurring without a remission period, or with remissions lasting less than three months, for at least one year |
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