The major concern with temporal arteritis is vision loss, although if allowed to progress, it may affect arteries in other areas of the body. This condition is potentially vision threatening, however, if treated promptly, permanent vision loss can be prevented. Vision is threatened when the inflamed arteries obstruct blood flow to the eyes and optic nerves. If untreated, permanent vision loss can occur from oxygen deprivation to the retina.

Signs and Symptoms

Patients with temporal arteritis usually notice visual symptoms in one eye at first, but as many as 50% may notice symptoms in the fellow eye within days if the condition is untreated.  Other symptoms include headache, tenderness of scalp (combing hair may be painful), pain in temple area, transient blurred vision, loss of appetite, fever, fatigue, depression, drooping lid, double vision, sore neck, jaw soreness especially when chewing food.

Detection and Diagnosis

When temporal arteritis is suspected, the doctor will order blood tests including a erythrocyte (red blood cell) sedimentation rate (ESR) and C-reactive protein test. The ESR test measures the time it takes for the erythrocytes to collect in the bottom of a test tube. The sediment layer of erythrocytes is measured in millimeters and recorded. An abnormally high ESR is indicative of active inflammation.

C-reactive protein is produced in the liver. This protein is released when the body responds to an injury or any other event that signals inflammation. C-reactive protein is measured with a blood test.

A biopsy of the temporal artery is usually recommended. The procedure is performed with local anesthesia. A small section of the temporal artery is removed and examined under magnification for inflammatory cells. This test allows doctors to definitively diagnose temporal arteritis.