Polymyositis

Definition

Polymyositis is a rare disease of the muscles. It usually affects the muscles closest to the trunk of the body. However, it may affect muscles anywhere in the body.
Front Muscles of Trunk
Trunk Core Muscles
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Causes

Polymyositis may be caused by a combination of genetic and environmental factors that trigger an abnormal immune response.

Risk Factors

Polymyositis is more common in women and in people aged 31-60 years old.

Symptoms

Polymyositis causes muscles become inflamed or swollen. Symptoms may include:
  • Muscle weakness
  • Muscle pain that increases over time
  • Fatigue
  • Great effort needed to climb stairs
  • Trouble rising from a chair
  • Difficulty reaching overhead
  • Chronic dry cough

Diagnosis

You will be asked about your symptoms and medical history. A physical exam will be done.Your bodily fluids and tissues may be tested. This can be done with: Your muscle activity may be measured. This can be done with an electromyogram (EMG). Images may be taken of your bodily structures. This can be done with an MRI scan.

Treatment

The disease is progressive and starts slowly. If untreated, the muscles gradually become weaker. The pain in the muscles also increases. While there is no cure, treatment can improve your muscle strength and function. Talk with your doctor about the best plan for you. Options include:

Medication

Medications to treat polymyositis may include:
  • Corticosteroids to reduce inflammation
  • Topical steroids to treat skin rash
  • Immunosuppresants
IV immunoglobulin therapy is another treatment option. It involves using an IV needle to inject extra immunoglobins (special proteins) into the body. This process may help the immune system function better and reduce inflammation.

Physical Therapy

Your doctor may recommend that you work with a physical therapist to prevent permanent muscle damage. Exercise may include:
  • A regular stretching routine for weakened arms and legs
  • Light strengthening as the pain lessens and function returns

Dietary Changes

Polymyositis can lead to problems with chewing and swallowing. By working with a registered dietitian, you can learn ways to adjust to these changes and get the nutrition that you need.

Speech Therapy

Polymyositis may also cause speech problems. A speech therapist can assess your condition and create a program for you.

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