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Cluster headaches are defined as a group of at least five headache attacks causing unilateral orbital, supraorbital and/or temporal pain, with at least one of the following simultaneous associated findings on the affected side:
- conjunctival injection
- lacrimation
- nasal congestion
- rhinorrhea
- ptosis
- miosis
- sweating on the forehead
Cluster headaches can occur at a frequency of one every other day t eight episodes per day.