Giant cell arteritis is an emergency condition in which delayed treatment can lead to end-organ ischemia, including permanent vision loss. Limb claudication, jaw claudication, and thickening of the temporal artery have the highest positive likelihood ratios for this diagnosis and should raise the physician's suspicion. About 4% of biopsy markers in patients with a confirmed diagnosis may be normal. If giant cell arteritis is suspected, it should be treated immediately with high doses of glucocorticoids and the patient should be urgently referred for a specialist examination. An 80-year-old woman presented for four weeks with jaw pain when eating several times a day, intermittent painless loss of vision, scalp tenderness when combing, and headaches. She later developed bilateral intermittent painless visual loss, which progressed to constant.