Polymyalgia rheumatica (PMR) is an inflammatory disorder. It results in muscle pain and stiffness in the body. The effects are most common in the shoulders, arms, hips, and thighs. About 15% of people with PMR will also develop giant cell arteritis(GCA). GCA is an inflammation of the lining of the arteries, the blood vessels that carry blood away from the heart.
The exact cause is not known. Inflammatory conditions may be associated with a problem with the immune system. Certain viruses may be responsible for PMR. Genetic factors may also play a role.
Muscle pain and/or stiffness in the hip, shoulder, or neck areas
Stiffness usually occurs in the morning or after long rests and may ease throughout the day
Unexplained weight loss