An involuntary, sudden contraction or spasm of blood vessels, causing them to narrow and reduce blood flow.
From Greek 'angion' (vessel) + 'spasmos' (spasm, convulsion). This medical term describes the acute muscular response of vessel walls.
Angiospasm is when blood vessels suddenly cramp up like a charley horse in your leg—they clench so hard they squeeze down blood flow, which can cause chest pain, stroke symptoms, or tissue damage depending on which vessel spasms.
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