Vasculitis is a condition that involves inflammation in the blood vessels. The condition occurs if your immune system attacks your blood vessels by mistake. This may happen as the result of an infection, a medicine, or another disease or condition. “Inflammation” refers to the body’s response to injury, including injury to the blood vessels. Inflammation may involve pain, redness, warmth, swelling, and loss of function in the affected tissues. In vasculitis, inflammation can lead to serious problems. Complications depend on which blood vessels, organs, or other body systems are affected.
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