Giant cell arteritis. This condition is an inflammation of the arteries in your head, especially at the temples. It usually occurs in people over age 50. Giant cell arteritis can cause headaches, scalp tenderness, jaw pain, blurred or double vision, and even blindness.It is also called temporal arteritis. Giant cell arteritis is linked to polymyalgia rheumatica, which causes pain and stiffness in muscles of the neck, shoulders, hips and thighs.iant cell arteritis. This condition is an inflammation of the arteries in your head, especially at the temples. It usually occurs in people over age 50. Giant cell arteritis can cause headaches, scalp tenderness, jaw pain, blurred or double vision, and even blindness.