Definition of Headache, thunderclap

1. A Visual Guide to Migraine Headaches Slideshow Pictures
2. Headache and Migraine Triggers Slideshow Pictures
3. Take the Migraines Quiz

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.