Disbalance in vessel: Blood vessels are lined by cells call endothelia. They make chemicals that both relax the vessels (vasodilator) & constrict them. Usually, the chems are kept in balance. in some individuals, the endothelium has a bias or predisposition to one or the other. The slightest thing can set it off. In your case, pseudoephedrine causes walls to overly constrict, raising blood pressure. Avoid OTC cold meds
Answered 4/2/2017
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