Differential diagnosis

• non-specific headache
• infection 

Why?

Differential diagnosis of giant cell arteritis c	% (95% CI)
non-specific headache	16% (10% to 23%)
infection	9.0% (4.1% to 14%)
cardiac emboli or artherosclerosis	9.0% (4.1% to 14%)
connective tissue disease	9.0% (4.1% to 14%)
other causes	10% (5.3% to 16%)