what is vasculitis
Vasculitis is a general term that refers to inflammation of blood vessels. When blood vessels become inflamed, they may become weakened, stretch, and either increase in size or become narrow -- even to the point of closing entirely.asculitis can sometimes develop after an infection has come and gone. Usually in these cases, the infection triggers an abnormal response in the person's immune system, damaging the blood vessels. Vasculitis also may be related to other diseases of the immune system that the person has had for months or years.