What causes polymyalgia rheumatica?
The cause of polymyalgia rheumatica is unknown, but a combination of genetic and environmental factors is thought to be responsible.
Polymyalgia rheumatica is age-related. Most people diagnosed with it are over 70, and it's very rare in people younger than 50. It's also more common in women than men.
It's estimated 1 in every 1,200 people in the UK develop the condition every year.