Giant cell arteritis: symptoms, treatment, and when to worry
Last updated September 3, 2026.
Giant cell arteritis (GCA), also called temporal arteritis, is inflammation of medium and large arteries, almost exclusively in people over 50, and it is an emergency because it can permanently blind. The warnings: a new, persistent headache, a tender scalp, and pain in the jaw when chewing. Steroids must start immediately on suspicion, before tests confirm, because vision loss can arrive suddenly and cannot be undone.
What does it look like?
The classic picture in someone over 50: a new headache, often over the temples, that does not behave like their usual headaches; a scalp so tender that brushing hair hurts; and jaw pain or tiredness when chewing that eases with rest. Add possible flu-like symptoms, weight loss, night sweats, and, in many, the shoulder and hip stiffness of polymyalgia rheumatica, its sibling condition. The danger sign is any visual symptom: double vision, blurred patches, or a temporary shadow or curtain, which means the eye's blood supply is threatened.
What actually helps?
- Steroids immediately on suspicion: high-dose prednisolone starts the same day the diagnosis is suspected, without waiting for tests. This single rule is what saves sight.
- Confirm fast: blood inflammation markers support the diagnosis, and an ultrasound or biopsy of the temporal artery confirms it, arranged within days, after steroids have started.
- Aspirin and bone protection: low-dose aspirin is often added, and bone protection (calcium, vitamin D, and usually a bone-protecting drug) accompanies the long steroid course.
- Slow taper with monitoring: treatment runs one to two years, tapering slowly with blood marker checks; flares are common and are managed by stepping the dose back up.
- Newer options for relapsing disease: an injectable biologic (tocilizumab) is added for difficult or relapsing courses to spare steroid exposure.
- Report visual symptoms instantly: any visual change at any point during treatment is same-day emergency care, no exceptions.
When is it an emergency?
GCA suspicion itself is same-day: anyone over 50 with a new persistent headache plus scalp tenderness, jaw pain on chewing, or visual symptoms needs urgent care today, and steroids should not wait for the workup. Any visual loss, even partial or temporary, is a 911-level emergency. Pymander's escalation routing is built and tested specifically for this class of decision; see the safety architecture working paper.
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Common questions
Why does giant cell arteritis need such urgent treatment?
Because the inflamed arteries include the ones feeding the optic nerve, and when one closes, vision in that eye is lost permanently, sometimes with no warning. Steroids started early almost entirely prevent this; started late, they cannot restore what is gone. That asymmetry, preventable blindness, drives the rule that steroids begin on clinical suspicion, the same day, with tests following after. No other rheumatological condition works on this clock.
What is jaw claudication?
Pain or tiredness in the jaw muscles when chewing, which builds as you chew and eases when you stop, like angina of the chewing muscles, because the mechanism is the same: inflamed arteries failing to supply working muscle. Tough foods reveal it first, steak and crusty bread. It is one of the most specific signs of giant cell arteritis, and in someone over 50 with a new headache it effectively mandates the same-day assessment.
How is giant cell arteritis diagnosed?
Fast, and after steroids have already started: blood tests showing high inflammation markers (ESR and CRP), ultrasound of the temporal arteries looking for the characteristic halo sign, and often a temporal artery biopsy, a small sample taken under local anaesthetic. Tests are scheduled within days because treatment must not wait for them, and because the biopsy stays informative for a couple of weeks into steroid treatment.
What is the connection between GCA and polymyalgia rheumatica?
They are the same disease process in different neighborhoods. Polymyalgia rheumatica inflames the shoulder and hip girdles; giant cell arteritis inflames arteries. Many patients have both, and each condition is a risk marker for the other. Anyone with PMR is taught the GCA warning signs, new headache, scalp tenderness, jaw pain on chewing, visual symptoms, because catching the conversion early is exactly what saves sight.
How long is the treatment for GCA?
High-dose steroids initially, tapering over typically one to two years, sometimes longer. Relapses during the taper are common, about half of patients experience one, and are handled by raising the dose briefly. Bone protection and often stomach protection accompany the course, and a biologic drug, tocilizumab, is added for relapsing or hard-to-taper cases. Most people eventually stop treatment and stay well.
Can giant cell arteritis come back after treatment?
It can, mostly during the tapering years, and relapses usually announce as returning headache, PMR-type stiffness, or rising blood markers, and respond to a dose increase. The vigilance never fully retires during treatment: any visual symptom, at any dose, at any point, is a same-day emergency. After a completed course, long-term recurrence is uncommon, but the warning-sign knowledge is for life.