While heart attack cases are reported throughout the year, the cold weather can heighten the possibility of heart attacks, especially in people with hypertension. "In winter, the blood vessels of the ...

Vasoconstriction - blood vessels near the surface of the skin called arterioles constrict (become narrower) allowing less blood to the skin surface and therefore less heat is lost by radiation.

Previous studies have demonstrated elevated blood pressure values in hypothyroid patients. 3,5,3'-triiodothyronine deficiency is associated with peripheral vasoconstriction. In severe ...

When a triptan binds to these receptors, it causes blood vessels in your brain to tighten (vasoconstriction). This has the effect of lowering pain signaling and inflammation. Generally speaking ...