What is this disease called "temporal arteritis"?

A complex disease: Temporal arteritis is inflammation and damage to blood vessels that supply the head area, particularly the large or medium arteries that branch from the neck and supply the temporal area. If the inflammation affects the arteries in your neck, upper body and arms, it is called giant cell arteritis.

Vasculitis: Another name for this is giant cell arteritis, and this is an inflammation of the blood vessels in the body. If untreated it can lead to blockages or aneurysms of the arteries. Temporal arteritis can lead to blindness in severe cases. Typical symptoms include headache and tenderness over the temporal artery, which is found along the hairline near the temple of your head. Treatment is with steroids.