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.
Last Editorial Review: 3/19/2012
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