Polymyalgia rheumatica (PMR) is an inflammatory condition affecting the muscles in and around the shoulder and upper arm areas, buttocks and thighs. The cause is unknown.

Polymyalgia rheumatica usually starts very suddenly. The stiffness in affected areas usually eases as the day progresses, but often returns in the evenings. In contrast to rheumatoid arthritis the joints are not usually involved, though occasionally there can be an associated inflammation in joints such as the shoulder, hip and wrist. Very occasionally, the arteries supplying the head and neck area of the body may be involved, causing headaches and possible loss of sight. This very serious complication of the disorder requires immediate treatment. You can find out more about the condition in the Understanding Arthritis information booklet.