"Thunderclap" headaches are caused by the sudden tightening of the vessels that supply blood to the brain, a condition known as reversible cerebral vasoconstriction syndrome (RCSV). Why hot ...
and reversible cerebral vasoconstriction syndrome (RCVS). RCVS can cause sudden, severe thunderclap headaches that often recur over a span of days to weeks. Symptoms of PRES may include blurred ...
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