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Muscle inflammation, or myositis, is a chronic disease characterised by inflammation of the muscles. Myositis is an autoimmune disease caused by white blood cells of the immune system attacking healthy muscle fibres and injuring or destroying them. This affects muscle function and can lead to fatigue, weakness, and pain. While the exact cause of myositis is unknown, it is believed to be triggered by factors such as infection, injury, or drug side effects. It can affect people of all ages, but the peak incidence occurs in individuals between the ages of 45 and 64. Myositis can impact various muscles in the body and may also cause lung inflammation, skin rashes, and joint issues. While there is no cure for myositis, treatments such as medications, physical therapy, and rest can help manage the symptoms.
| Characteristics | Values |
|---|---|
| Term | Myositis |
| Description | Muscle inflammation |
| Causes | The immune system attacking muscles throughout the body |
| Symptoms | Muscle pain, swelling, weakness, trouble swallowing, fatigue, rash, trouble performing movements |
| Diagnosis | Physical examination, blood tests, muscle biopsy, MRI, EMG, lumbar puncture |
| Treatment | Corticosteroids, immunosuppressants, intravenous immunoglobulin, physical therapy exercises |
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What You'll Learn
What is myositis?
Myositis is the medical term for muscle inflammation. It is an autoimmune disease characterised by inflammation of muscle fibres, which causes muscles to become weak and can interfere with their ability to contract. This can lead to muscle atrophy (wasting and shrinking) and severe disability. The inflammation is caused by white blood cells of the immune system, which, in people with myositis, mistakenly attack their own healthy muscle fibres. This can cause muscle fibres to be injured or destroyed, affecting muscle function and leading to fatigue and weakness.
Myositis can affect the whole body, not just the muscles. It can cause arthritis in the hands, lung inflammation resulting in coughing or shortness of breath, and skin inflammation or rashes. The weakening and tiredness in the muscles can make people with myositis more likely to fall over.
There are many different types of myositis, including idiopathic inflammatory myopathies, which are chronic diseases marked by muscle inflammation. The cause of the muscle inflammation in these cases is unknown. There are three major types of myositis: dermatomyositis, polymyositis, and inclusion body myositis. Dermatomyositis is characterised by progressive muscle weakness accompanied by a patchy skin rash, usually appearing on the face, eyelids, knuckles, elbows, knees, chest, and back. Polymyositis causes muscle weakness, usually in the muscles closest to the trunk of the body, and usually affects adults, more often female, aged 30 to 60. Inclusion body myositis is a degenerative muscle disease that occurs when certain proteins clump together, causing weakness, especially in the lower body. It is more common in men over the age of 50.
Myositis is rare, affecting about 50,000 Americans. It can affect adults and children, both male and female. The peak incidence of idiopathic inflammatory myopathies takes place in people between the ages of 45 and 64, with fewer cases in younger (25 to 44) or older (65+) age groups. Symptoms of myositis can include muscle pain, and muscle tenderness. Although anyone can get myositis, people in their middle age, women, and those with Sub-Saharan African descent are at higher risk.
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Causes of muscle inflammation
Muscle inflammation, or myositis, can be caused by a variety of factors, including injury, infection, and autoimmune conditions. While the exact causes of myositis are not fully understood, it is believed to be triggered by certain conditions and lifestyle factors.
Injury and overuse are common causes of muscle inflammation. Traumatic injuries, such as sports injuries or accidents, can bruise or tear muscles, leading to inflammation and pain. Repetitive strain injuries from overuse can also cause small tears in muscle fibres, resulting in inflammation and discomfort. Intense exercise can lead to muscle inflammation, technically considered a mild form of myositis, and symptoms typically resolve with rest and recovery.
Infections, including viral, bacterial, fungal, and other organisms, can trigger muscle inflammation. Viral infections, such as the common cold, flu, and HIV, are the most common infectious causes of myositis. These infections can directly attack muscle tissue or release substances that damage muscle fibres, leading to inflammation.
Autoimmune conditions, where the body's immune system mistakenly attacks its own healthy muscle fibres, are a significant cause of muscle inflammation. Myositis is characterised as an autoimmune disease, and it can occur as a primary condition or secondary to other rheumatic diseases such as lupus, scleroderma, or vasculitis. People with certain autoimmune conditions like rheumatoid arthritis are also at risk of developing myositis.
Additionally, certain medications and drugs can cause temporary muscle damage and inflammation. Statins, used to lower cholesterol levels, are known to cause muscle damage as a side effect. Drug-induced myopathies, or muscle diseases, can sometimes resemble myositis, and severe myositis caused by medications is considered rare.
It is important to note that muscle inflammation can be influenced by various factors, and proper diagnosis and treatment should be sought from medical professionals.
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Symptoms of muscle inflammation
Muscle inflammation, or myositis, is an autoimmune disease characterised by inflammation of the muscles. Myositis can affect the whole body, not just the muscles. The symptoms of myositis vary between different people, but the most common symptom is muscle weakness. This weakness often develops slowly and can be subtle at first, but it can influence a person's ability to do certain activities. For example, people with myositis may have trouble doing tasks that require holding their arms above their head, such as washing or brushing their hair, or reaching items on high shelves. They may also have trouble getting up from low chairs, getting out of a car, climbing steps, or walking.
Myositis can also cause muscle fatigue, frequent falling, and pain. The muscles may swell, hurt, or feel tender, especially around the hips, thighs, and shoulders. Some people with myositis experience muscle pain, while others do not. In addition to muscle pain, people with dermatomyositis may experience a red or purple rash on the upper eyelids, face, neck, elbows, knees, toes, chest, or back. These rashes can appear before, after, or during symptoms of muscle weakness. People with dermatomyositis may also be sensitive to light and have hardened, white bumps under the skin (calcinosis).
In some cases, myositis can affect breathing and swallowing. This may occur at the start of severe cases when the muscles used for these important tasks become weak. Lung and heart conditions can cause long-term breathlessness. About 30 to 40 percent of people with myositis have some form of lung disease. Inflammation of the heart muscle (myocarditis) can lead to tissue scarring and poor heart function.
Myositis can also cause arthritis in the hands, lung inflammation that causes coughing or shortness of breath, and skin inflammation or rashes. Each patient’s disease experience and mix of symptoms is unique. Some cases are very mild, while others are severe.
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Treatment for muscle inflammation
Muscle inflammation, or myositis, is caused by white blood cells of the immune system mistakenly attacking healthy muscle fibres, injuring or destroying them. This affects muscle function and can lead to fatigue and weakness. While there is no cure for myositis, there are several treatment options available to manage symptoms.
The treatment for muscle inflammation depends on the underlying cause. In the case of myositis, treatment focuses on managing symptoms and slowing the progression of the disease. Here are some common treatments for muscle inflammation:
- Medications: Doctors often treat myositis with high doses of corticosteroids. Other medications may also be prescribed to help manage symptoms and slow the progression of the disease.
- Physical Therapy: Physical therapy and exercise can help improve muscle strength and flexibility, reduce inflammation, and improve overall physical function.
- Heat Therapy: Applying heat to the affected area can improve blood circulation and reduce inflammation. This can include taking a warm bath or using a hot compress.
- Rest: Getting adequate rest is crucial for managing muscle inflammation. Elevating the affected area can also help reduce strain and promote healing.
- Pain Relievers: Over-the-counter pain relievers, such as aspirin, acetaminophen, ibuprofen, or naproxen, can help reduce pain and inflammation associated with muscle inflammation.
- Complementary Therapies: Complementary therapies such as massage, acupuncture, and meditation can provide additional relief and help manage stress associated with the condition.
- Medical Procedures: In some cases, additional tests and procedures may be necessary. Blood tests, imaging tests (CT or MRI), muscle biopsies, and electromyography (EMG) can help doctors make a proper diagnosis and develop a treatment plan.
It is important to consult a healthcare professional for proper diagnosis and treatment. While some forms of muscle inflammation can be managed at home, more severe or persistent cases may require medical attention to prevent further complications.
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Risk factors
Muscle inflammation, or myositis, is caused by white blood cells of the immune system attacking a person's own healthy muscle fibres. This affects muscle function and can lead to fatigue, weakness, swelling, and pain. While the exact cause of myositis is unknown, there are several risk factors that can trigger inflammation, including:
- Age: People in their middle age are at a higher risk of developing myositis. Polymyositis, a type of inflammatory myopathy, most often affects people aged 31 to 60. Inclusion body myositis usually affects people older than 50.
- Sex: Women are at a higher risk of developing myositis.
- Ethnicity: People of Sub-Saharan African descent are at a higher risk.
- Infections: Viral infections are the most common infectious cause of myositis, but bacterial, fungal, or other organisms can also trigger it. Viral and bacterial infections can attack muscle tissue directly or release substances that damage muscle fibres.
- Autoimmune Conditions: Many inflammatory conditions are autoimmune conditions, where the body attacks its own tissues. Myositis can be caused by necrotizing autoimmune myopathy, where muscle cells start to die, leading to muscle weakness.
- Medications: Certain medications and drugs can cause temporary muscle damage or an allergic response that leads to muscle irritation and damage. Statins, for example, can cause muscle damage as a side effect.
- Injury: Traumatic injuries, including sports injuries and accidents, can cause muscle inflammation. Intense exercise can lead to muscle pain, swelling, and weakness.
- Other Conditions: Myositis can be caused by other conditions such as muscular dystrophy, fibromyalgia, and chronic fatigue syndrome.
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Frequently asked questions
Muscle inflammation is medically referred to as myositis. It involves chronic inflammation of the muscles, often occurring with other symptoms.
The exact cause of muscle inflammation is not known, but it is believed to be triggered by infection, injury, autoimmune conditions, or drug side effects. It is caused by white blood cells of the immune system, which mistakenly attack a person's healthy muscle fibres.
The symptoms of muscle inflammation vary between different people. Some common symptoms include muscle weakness, pain, swelling, fatigue, and in some cases, muscle damage.
