Cluster headache refers to a type of severe headache that occurs in daily clusters for 4 to 16 weeks. Symptoms are similar to migraine, but duration is much briefer.
Other /More definition:
Cluster headache refers to a type of severe headache that occurs in daily clusters for 4 to 16 weeks. The symptoms of Cluster headache are similar to migraine, but the duration is much briefer.

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