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Muscle Inflammation (Myositis): Causes and Treatment

Muscle inflammation (myositis) is an inflammation of the skeletal muscles causing pain, weakness, and swelling. It can result from infections, autoimmune conditions, or other causes.

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Things worth knowing about "Muscle Inflammation"

Muscle inflammation (myositis) is an inflammation of the skeletal muscles causing pain, weakness, and swelling. It can result from infections, autoimmune conditions, or other causes.

What Is Muscle Inflammation?

Muscle inflammation, medically known as myositis, refers to inflammation of the skeletal muscles. It can affect individual muscle groups or multiple muscles simultaneously and typically presents with pain, weakness, and sometimes swelling in the affected areas. The condition can follow an acute or chronic course and occurs in several distinct forms.

Causes

Muscle inflammation can be triggered by a wide range of factors:

Infections: Viral infections are the most common cause (e.g., influenza, COVID-19, Coxsackievirus), but bacterial and parasitic pathogens can also lead to myositis.
Autoimmune diseases: In conditions such as polymyositis, dermatomyositis, or inclusion body myositis, the immune system mistakenly attacks the body´s own muscle tissue.
Medications: Certain drugs, particularly statins (cholesterol-lowering agents), can trigger drug-induced myositis.
Trauma and overuse: Intense physical activity or muscle injuries can provoke local inflammatory responses.
Systemic diseases: Rheumatic conditions such as lupus erythematosus or rheumatoid arthritis can also be associated with myositis.

Symptoms

The symptoms of muscle inflammation vary depending on the cause and severity:

Muscle pain (myalgia) that worsens with movement or pressure
Muscle weakness, particularly in proximal muscle groups (shoulders, hips, thighs)
Swelling and tenderness of the affected muscles
General fatigue and exhaustion
Elevated body temperature (in cases of infectious origin)
In dermatomyositis: characteristic skin changes such as a lilac-colored rash (Gottron papules)
In severe cases: difficulty swallowing or breathing (when the relevant muscles are involved)

Diagnosis

The diagnosis of muscle inflammation is established through a combination of investigations:

Blood tests: Elevated muscle enzymes such as creatine kinase (CK), lactate dehydrogenase (LDH), and myoglobin indicate muscle damage. Inflammatory markers such as CRP and ESR are often raised.
Electromyography (EMG): Measures electrical activity in muscles to assess muscle function.
Imaging: MRI (magnetic resonance imaging) can reveal inflammatory changes within muscle tissue.
Muscle biopsy: A tissue sample from the affected muscle allows detailed histological examination and identification of the underlying cause.
Autoantibody testing: Specific antibodies in the blood are measured when an autoimmune cause is suspected.

Treatment

Treatment is tailored to the underlying cause:

Drug Therapy

Corticosteroids (e.g., prednisone) are the first-line treatment for autoimmune myositis and have powerful anti-inflammatory effects.
Immunosuppressants such as methotrexate or azathioprine are used in chronic autoimmune cases.
Antiviral or antibiotic medications are prescribed when an infectious cause is identified.
Pain management with nonsteroidal anti-inflammatory drugs (NSAIDs) to relieve pain and inflammation.

Physiotherapy and Rehabilitation

Targeted physiotherapy helps maintain or restore muscle function and strength. Exercises are adapted to the stage of the disease to avoid overexertion.

General Measures

Rest and adequate recovery periods during the acute phase
Application of heat or cold for pain relief
Adjustment or discontinuation of triggering medications in consultation with a physician

When to See a Doctor

Persistent muscle pain, unexplained muscle weakness, or swelling should prompt a timely medical consultation. Medical attention is particularly urgent if accompanied by difficulty swallowing or breathing, high fever, or visible skin changes, as these may indicate a more serious course of the disease.

References

Dalakas MC. Inflammatory muscle diseases. New England Journal of Medicine. 2015;372(18):1734-1747.
Lundberg IE et al. 2017 European League Against Rheumatism/American College of Rheumatology classification criteria for adult and juvenile idiopathic inflammatory myopathies. Annals of the Rheumatic Diseases. 2017;76(12):1955-1964.
National Institute of Neurological Disorders and Stroke (NINDS): Myositis Information Page. Available at: www.ninds.nih.gov

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