Giant cell arteritis is an inflammation of the lining of your arteries — the blood vessels that carry oxygen-rich blood from your heart to the rest of your body. Most often, it affects the arteries in your head, especially those in your temples. For this reason, giant cell arteritis is sometimes called temporal arteritis or cranial arteritis.
Giant cell arteritis frequently causes headaches, jaw pain, and blurred or double vision. Blindness and, less often, stroke are the most serious complications of giant cell arteritis.
Prompt treatment of giant cell arteritis is critical in order to prevent permanent tissue damage and loss of vision. Corticosteroid medications usually relieve symptoms of giant cell arteritis and may prevent loss of vision. You'll likely begin to feel better within days of starting your treatment.