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Medically reviewed by Last updated on Jun 5, 2024.

What is polymyositis?

Polymyositis is a condition that causes inflammation and weakness of your muscles. The arms and legs are most often affected. The symptoms usually get slowly worse over weeks to months. The cause may not be known. Your immune system may attack your muscle tissue for unknown reasons. Viruses may also cause polymyositis.

What are the signs and symptoms of polymyositis?

The most common symptom is muscle weakness in the upper arms, thighs, and hip. You may also have weakness in the muscles of your neck, lungs, or heart. You may have trouble with daily activities, such as getting up from a chair, combing your hair, or lifting objects. You may also have any of the following:

How is polymyositis diagnosed?

How is polymyositis treated?

Medicines may help decrease inflammation or slow an attack on your muscles by your immune system.

Treatment options

The following list of medications are related to or used in the treatment of this condition.

How can I manage my symptoms?

When should I contact my healthcare provider?

When should I seek immediate care or call 911?

Care Agreement

You have the right to help plan your care. Learn about your health condition and how it may be treated. Discuss treatment options with your healthcare providers to decide what care you want to receive. You always have the right to refuse treatment. The above information is an educational aid only. It is not intended as medical advice for individual conditions or treatments. Talk to your doctor, nurse or pharmacist before following any medical regimen to see if it is safe and effective for you.

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Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.