Typically:
Age >50, abrupt onset usually unilateral temporal headache, with Temporal Artery abnormality eg tender, thickened, reduced or absent pulsation, and ESR > 50. (Usually, but not always, 3 or more of these will be present).
And/or may have:
Scalp tenderness, jaw and tongue claudication, visual symptoms including diplopia, “shade covering an eye”, fever, fatigue, weight loss, PMR symptoms, limb claudication.
Examine for:
Abnormal temporal artery, scalp tenderness, reduce visual acuity, pupillary defect, pale swollen haemorrhagic optic discs, central retinal artery occlusion, upper cranial nerve palsies, bruits, asymmetrical BP’s and pulses.
Consider Differential Diagnosis:
Migraine, cluster headache, herpes zoster, intra-cranial pathology, other cause visual loss eg TIA, cervical spondylosis or other C spine disease, TMJ pain, ear pathology, systemic vasculitis.