A vascular spasm is a sudden constriction of a blood vessel, which can reduce or temporarily stop blood flow. This reaction can occur in response to various triggers, such as injury, stress, or exposure to cold. Vascular spasms can affect arteries or veins and may lead to symptoms like pain or discomfort in the affected area. In some cases, vascular spasms can contribute to serious conditions, such as angina or heart attacks. They can also occur in smaller blood vessels, affecting circulation in areas like the hands or feet. Treatment often focuses on addressing the underlying cause and restoring normal blood flow.