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Serotonin (5-hydroxytryptamine, 5-HT) is implicated in the pathogenesis of migraine; however, its role in tension headache has not yet been studied. The uptake of 5-HT by platelets in patients of tension headache was significantly higher compared with migraineurs as well as controls. The basal platelet 5-HT levels did not show a significant difference. The study implicates the role of serotonin in tension headache.
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Shukla et al. (1987) studied this question.
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