Vasoconstriction

Vasoconstriction is the narrowing of blood vessels, which occurs when the smooth muscles in their walls tighten and contract. This process reduces blood flow to specific areas of the body and is often triggered by cold temperatures, stress, or certain hormones and medications that signal blood vessels to constrict. Your body uses vasoconstriction strategically to regulate blood pressure, conserve heat, and control bleeding, though excessive constriction can sometimes lead to health problems like reduced oxygen delivery to tissues.