Vasculitis involves inflammation of the blood vessels. The inflammation can cause the walls of the blood vessels to thicken, which reduces the width of the passageway through the vessel. If blood flow is restricted, it can result in organ and tissue damage.
There are many types of vasculitis, and most of them are rare. Vasculitis might affect just one organ, or several. The condition can be short term or long lasting.

Vasculitis can affect anyone, though some types are more common among certain age groups. Depending on the type you have, you may improve without treatment. Most types require medications to control the inflammation and prevent flare-ups.