An inflammation, or swelling, of your blood vessels that includes arteries, veins and/or capillaries. It causes blood vessels to weaken and/or narrow, often leading to a blockage. Inflammatory vasculitis can be caused by multiple factors, including autoimmune diseases, as well as a side effect of some medications. Symptoms Fever Weight loss Dark or purple colored spots on your skin Arthritis Headache Stroke Hypertension Abdominal pain Bloody cough Gangrene Treatment Corticosteroids, immunosuppression therapy and antibiotics are all common treatments. If any organs are damaged as a result of the vasculitis, they may require additional treatment.