Professor Anthony, associated with the University of New South Wales, found that “patients who abuse headache tablets have a shortage of serotonin, ” a substance that restricts the expansion of blood vessels.
ولاحظ ان « معدل السيروتونين المنخفض يؤدي الى تمدد الشرايين ،‏ ما يسبب الصداع » .‏