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In medicine a headache or cephalalgia is a symptom of a number of different conditions of the head and sometimes neck. Some of the causes are benign while others are medical emergencies. It ranks among the most common pain complaints.
There are a number of different classification systems for headaches. The most well-recognized is that of the International Headache Society.
Treatment of a headache depends on the underlying etiology or cause, but commonly involves analgesics.
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