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Diseases & Conditions
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A cluster headache is one of the most painful types of headache. A striking feature of cluster headache is that the attacks occur in cyclical patterns, or clusters — which gives the condition its name.
Symptoms may include:
- sharp, penetrating pain on same side of head throughout a cluster period
- restlessness
- teary eye
- stuffy nose
- reduced pupil size
- drooping eyelid
Types include:
- episodic - cluster headache occurs at least daily for one week to one year, followed by a pain-free remission period lasting at least one month before another cluster period develops
- chronic - cluster headache occurs daily for more than a year with no remission or with pain-free periods lasting less than one month
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