Myositis is any condition that causes inflammation or swelling of the muscles. It can be caused by an injury, infection or an autoimmune disorder, in which the body attacks its own tissues. Myositis is classified by conditions. They include:
Inflammatory Conditions – caused by inflammation in the muscles. Many are a result of autoimmune conditions.
Severe cases of myositis include:
- Inclusion body myositis
These conditions cause severe myositis and require long-term treatment with medications such as Prednisone, Azathioprine and Methotrexate.
Milder cases of inflammatory conditions:
Infection Conditions– viral infections are the greatest source of myositis. Although they hardly ever cause myositis, bacteria, fungi or other organism can cause it as well. Both viruses and bacteria (such as the common cold, the flu virus and HIV) may attack the muscle tissue directly or introduce substances that harm the muscle fibers. Myositis caused by a viral infection does not have a particular treatment plan. Bacterial myositis is treated with antibiotics.
Drugs – a variety of medications and drugs can cause temporary muscle damage. It may present immediately or months after taking a drug. Myositis can also occur due to interaction of two different drugs. Severe myositis is rare with drugs. Drugs causing myositis include:
Treatment options include discontinuing the medication.
Injury – Strenuous workout can cause muscle pain, swelling and weakness for days or hours after an intense workout. When Inflammation contributes to the symptoms, it causes myositis. Symptoms go away with rest and recovery.
Rhabdomyolysis – occurs when the muscle breaks down rapidly. Symptoms include muscle pain, weakness, swelling and dark brown or red color urine. Treatment options for rhabdomyoysis involve hospitalization with intravenous fluids in large quantities.
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