What Does Heat Do to Blood Vessels?

Heat causes the blood vessels to dilate (open wide) which brings more blood into the area, says Dr. Leary. It also has a direct soothing effect and helps to relieve pain and spasm. When using heat treatments, be very careful to only use a moderate heat for a limited time to avoid burns.

How does heat affect blood vessels?

Heat causes the veins to dilate, making it even harder for them to work properly—and easier for blood to stay in the vein. Varicose veins are already visibly dark and bumpy and can also cause legs to ache, itch, and feel heavy. The extra heat, then, adds extra discomfort to an already-frustrating health condition.

Does heat constrict blood vessels?

Constricting blood vessels inhibits the body from allowing inflammation in the iced area. Heat dilates, or widens blood vessels, allowing more inflammation to flow to an injured or painful area.