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Cluster headaches are extremely painful, but treatable and preventable, one neurologist says.
Because they are so rare, they are often misdiagnosed as migraines or allergies and aren't treated appropriately.
Cluster headaches are short but extremely painful headaches that occur in clusters, usually at the same time of the day and night for several weeks, according to the U.S. National Institute of Neurological Disorders and Stroke.
They occur on one side of the head, often behind or around one eye, and may be preceded by a migraine-like aura and nausea. The pain can last for up to three hours. It often wakes people from their sleep.
Other symptoms include tears, runny nose or congestion, sweating and redness on one side of the face.
"In most cases, this kind of headache is very treatable once it is correctly diagnosed. During an episode, we can inject a drug used to treat migraines, which can provide relief within minutes. And there are several drugs available that are quite effective in preventing these headaches," Bryson said in a medical center news release.
She added, however, that people respond differently to treatment. Some "do have intractable headaches that can be very difficult to treat," Bryson said.

Men are three times more likely to get cluster headaches than women. Bryson suggested that anyone with cluster headache symptoms seek out headache specialist.