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Definition of Headache, thunderclap

Headache, thunderclap: A sudden and excruciatingly painful headache. Some physicians feel that in the absence of a known headache disorder, such as migraines, a thunderclap headache may sometimes signal a ruptured aneurysm in the brain. A person who experiences this type of headache should immediately seek medical attention.

Source: MedTerms™ Medical Dictionary
http://www.medicinenet.com/script/main/art.asp?articlekey=11404
Last Editorial Review: 3/19/2012

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