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ruzuzu commented on the word thunderclap headache
"A headache is called "thunderclap headache" if it is severe in character and reaches maximum severity within seconds to minutes of onset. In many cases, there are no other abnormalities, but the various causes of thunderclap headaches may lead to a number of neurological symptoms. The most important causes are subarachnoid hemorrhage, cerebral venous sinus thrombosis and cervical artery dissection."
-- http://en.wikipedia.org/w/index.php?title=Thunderclap_headache&oldid=536241101
March 7, 2013