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Vasculitis, also known as angiitis and arteritis, is an inflammation of the blood vessels (arteries, veins & capillaries). Arteries carry blood from your heart to your body's organs. Veins carry blood from your organs and limbs back to your heart. Capillaries connect the small arteries and veins.* “Inflammation” refers to the body’s response to injury, including injury to the blood vessels. Inf...