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 results in inflammation and swelling of arteries. This occurs most often in the head. If not treated quickly, GCA may cause permanent blindness.
The exact cause is not known. Inflammatory conditions tend to be due to some kind of problem with the immune system. Some evidence suggests that certain viruses could be responsible for PMR and GCA. Genetic factors may also play a role as well.
Factors that may increase the risk for PMR and GCA include:
Age: 50 and older
Ethnicity: PMR is most common in Caucasians, particularly those from northern Europe
Symptoms of PMR often develop within two weeks. They may include:
Muscle pain and/or stiffness in the hip, shoulder, or neck areas
Headache, sometimes very severe, may also be associated with scalp hypersensitivity to touch
Pain or tenderness in the temple
Changes in vision
Pain in the jaw or tongue with chewing
GCA needs to be treated immediately. This condition can lead to permanent blindness.
Your doctor will ask about your symptoms and medical history. A physical exam will be done. There is no single test for PMR. To support the diagnosis and rule out other conditions, tests may include:
Erythrocyte sedimentation rate (ESR)—a blood test that measures how quickly red blood cells fall to the bottom of a test tube. In the case of inflammation, levels of fibrinogen increase in the blood. Fibrinogen makes the red blood cells clump. This makes them fall faster.
Rheumatoid factor (RF)—a blood test that looks for a specific antibody (RF) in the blood. A positive RF test suggests a condition other than PMR.
Complete blood count—a blood test that measures the amount of different blood cells present in whole blood. Patients with GCA or PMR often have anemia. This will result in low counts of red blood cells. Patients with PMR have elevated levels of platelets.
C-reactive protein—a protein produced in the liver. It increases when there is inflammation.
—removal of a sample of muscle tissue for examination (rare).
If you have PMR, your doctor may also consider the possibility of GCA. Evaluation for GCA includes:
Physical exam, including vision test
of an affected blood vessel is necessary to confirm the diagnosis
Symptoms of PMR will disappear without treatment within several months to years. However, treatment leads to a dramatic improvement. It can occur within 24-48 hours. Treatment usually consists of:
Giant Cell Arteritis
GCA must be treated before blindness occurs. The blindness can not be reversed. Treatment is usually a high dose of corticosteroid medication for about one month. This is then tapered to a smaller dose for maintenance therapy. This step usually lasts for at least 1-2 years.
There are no known steps to prevent either PMR or GCA.
Please be aware that this information is provided to supplement the care
provided by your physician. It is neither intended nor implied to be a
substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER
IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the
advice of your physician or other qualified health provider prior to
starting any new treatment or with any questions you may have regarding a