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Inflamed muscles, or myositis, are chronic diseases marked by muscle inflammation. Myositis is an autoimmune disease where the immune system mistakenly injures muscles and other tissues, causing muscle weakness and other related conditions. The most common symptoms of myositis are muscle weakness and fatigue, and less commonly, muscle pain. Myositis can affect the whole body, not just the muscles, and can cause lung inflammation, skin inflammation, and arthritis. Polymyositis and dermatomyositis are two specific types of myositis, with the former causing muscle weakness and the latter causing muscle weakness and a skin rash.
| Characteristics | Values |
|---|---|
| Name of Condition | Myositis |
| Other Names | Idiopathic inflammatory myopathies (IIM), chronic inflammatory myopathies |
| Cause | Unknown, but may be due to injury, infection, autoimmune disease, or medication |
| Risk Factors | Age, sex, ethnicity (people of Sub-Saharan African descent are at higher risk) |
| Symptoms | Muscle inflammation, weakness, fatigue, pain, skin rashes, difficulty swallowing, shortness of breath, arthritis, lung inflammation |
| Diagnosis | Physical exam, blood tests, imaging tests (MRI), muscle biopsy, electromyelogram (EMG) |
| Treatment | Corticosteroids, anti-inflammatory drugs, physical therapy, exercise, heat therapy, assistive devices, rest |
| Prevention | Unknown, but may involve avoiding certain medications and vigorous exercise |
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What You'll Learn
- Myositis: inflammation of muscles caused by an injury, infection, or autoimmune disease
- Polymyositis: muscles become irritated, inflamed, and weak, affecting movement
- Dermatomyositis: a rash on the skin and eyelids, along with muscle weakness
- Inclusion body myositis: weakness in muscles near the arms or legs, causing difficulty in gripping objects
- Treatment: no cure, but symptoms can be managed with anti-inflammatory medicines, steroids, and physical therapy
Myositis: inflammation of muscles caused by an injury, infection, or autoimmune disease
Myositis is a chronic inflammatory disease that affects the muscles used for movement. It is characterised by inflammation of the muscles, which can be caused by an injury, infection, or autoimmune disease. The condition can present in different forms, and it is estimated that around 50,000 people in the US are living with myositis.
There are two specific types of myositis: polymyositis and dermatomyositis. Polymyositis causes muscle weakness, usually in the muscles closest to the trunk of the body. It can affect muscles all over the body and make even simple movements difficult. The condition is not well understood, but it is believed to be linked to a virus or an autoimmune reaction. In some cases, it may be triggered by a medicine that causes an allergic response. Polymyositis can be treated with anti-inflammatory medicines, such as steroid medications or corticosteroids, which help to ease inflammation.
Dermatomyositis causes muscle weakness and a skin rash. Children with dermatomyositis may develop painful deposits of calcium in their damaged muscles, which can lead to permanently rigid joints. This type of myositis can also cause a red or pink rash on the upper eyelids, face, neck, and the backs of the hands and fingers.
In addition to muscle weakness and potential skin issues, people with myositis often experience significant fatigue and difficulty sustaining physical efforts. Muscle pain is not always present but can occur in about a third of cases. Myositis can also affect muscle endurance, making it hard for patients to grip objects or carry heavy items.
Myositis is caused by the white blood cells of the immune system, which normally protect the body from infections, mistakenly injuring muscles and other tissues. While anyone can get myositis, people of Sub-Saharan African descent are at a higher risk of developing the condition. It is more common in middle-aged individuals and affects more women than men. Diagnosis of myositis is challenging and typically involves a physical exam, lab tests, imaging tests, and a muscle biopsy. While there is no cure for myositis, its symptoms can be managed through various treatments, including medications, physical therapy, exercise, heat therapy, assistive devices, and rest.
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Polymyositis: muscles become irritated, inflamed, and weak, affecting movement
Inflammation of the muscles is known as myositis. This can be caused by injury, infection, or autoimmune disease. Myositis can affect the whole body, not just the muscles, and can cause muscle weakness, pain, and fatigue.
Polymyositis is a rare form of myositis, an inflammatory myopathy, that causes muscles to become irritated, inflamed, and weak, affecting movement. It is a chronic disease that can affect muscles all over the body, making even simple movements difficult. Polymyositis can lead to severe, life-threatening complications if it affects the muscles used for breathing and swallowing. The condition typically affects people aged 31 to 60, and it rarely occurs in those under 18.
The exact cause of polymyositis is unknown, but it is believed to be linked to a virus or an autoimmune reaction. In some cases, medications can trigger polymyositis. The disease causes the muscles to break down and become weak, making everyday tasks challenging. Patients may experience difficulty walking up stairs, lifting their arms, or getting out of a chair. As the inflammation spreads, pain and weakness may affect the ankles, wrists, and lower arms.
Polymyositis is typically treated with anti-inflammatory medications, such as steroid medicines or corticosteroids. Other treatments include immunosuppressive medications, physical therapy, exercise, heat therapy, assistive devices, and rest. While there is no cure for polymyositis, symptoms can be managed with treatment.
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Dermatomyositis: a rash on the skin and eyelids, along with muscle weakness
Myositis is a chronic disease characterised by inflammation of the muscles that one uses to move their body. It is an autoimmune disease where the immune system mistakenly attacks muscles and other tissues, causing muscle weakness and other related conditions. The exact cause of myositis is unknown, but it can be triggered by an injury, infection, or an underlying autoimmune disease.
Dermatomyositis is a specific type of myositis that causes muscle weakness and a skin rash. The rash typically appears as a red or pink colour on the upper eyelids, face, neck, and the backs of the hands and fingers. In addition to the rash, dermatomyositis can also cause pain and swelling of the joints, as well as lung inflammation resulting in coughing or shortness of breath.
The symptoms of dermatomyositis can vary in severity and may develop slowly over weeks or months. The muscle weakness associated with the condition can affect large muscle groups, including the neck, shoulders, hips, and back, making everyday tasks such as climbing stairs or brushing hair difficult. In some cases, dermatomyositis may also affect the muscles used for breathing and swallowing, leading to severe complications.
There is currently no cure for dermatomyositis, but the symptoms can be treated and managed. Initial treatment typically involves high doses of corticosteroids, followed by other options such as medications, physical therapy, exercise, heat therapy, assistive devices, and rest. While there is no known way to prevent dermatomyositis, managing the condition involves understanding its triggers, which may include certain medications, infections, or underlying autoimmune conditions.
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Inclusion body myositis: weakness in muscles near the arms or legs, causing difficulty in gripping objects
Myositis is an autoimmune disease characterised by inflammation of muscles. It is caused by white blood cells of the immune system, which normally protect the body from infections, mistakenly injuring muscles and other tissues. The two specific types of myositis are polymyositis and dermatomyositis.
Inclusion body myositis (IBM) is a rare form of myositis that causes weakness in muscles near the arms or legs, making it difficult to grip objects. It is a degenerative muscle disease that causes a gradual and often painless weakening of muscles. IBM progresses over several years and is more common in men than women, usually affecting people over the age of 50. It is characterised by the presence of inclusion bodies, which are abnormal structures or clumps of protein found in muscle cells. These clumps can only be seen with special microscopes and may be byproducts of a viral infection, cellular damage, or genetic mutations.
The symptoms of IBM include increasing muscle weakness in the arms, legs, shoulders, hips, hands, and feet. This can lead to difficulties with ordinary tasks such as using the hands and fingers for precise tasks like buttoning a shirt, gripping small objects, or writing with a pen. It can also cause muscle atrophy (thinning and wasting of muscles), mild and frequent muscle pain, and difficulties with swallowing and breathing. The location, severity, and onset of symptoms may vary from person to person, with some people experiencing symptoms on one side of the body more than the other.
There is currently no cure or effective treatment for IBM, and it does not respond to corticosteroids or immunosuppressant drugs commonly used to treat other types of myositis. However, physical therapy and regular exercise are crucial to preserving muscle strength and improving quality of life. Occupational therapy can also help make daily activities easier and reduce the risk of falling. While IBM is not life-threatening, it can become disabling over time and may indirectly shorten life span through the loss of muscle strength.
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Treatment: no cure, but symptoms can be managed with anti-inflammatory medicines, steroids, and physical therapy
Inflammation of the muscles, or myositis, can be caused by an injury, infection, or autoimmune disease. While there is no cure for myositis, symptoms can be managed through various treatments.
Anti-inflammatory medicines
Nonsteroidal anti-inflammatory drugs (NSAIDs) are often used to reduce inflammation and pain. Common over-the-counter NSAIDs include aspirin, ibuprofen, and naproxen sodium. It is important to note that NSAIDs may have side effects, especially for those with certain medical conditions or who are taking other medications. For example, children with viral infections should not take aspirin due to the risk of Reye's syndrome, a rare but serious illness.
Steroids
For specific types of myositis, such as polymyositis and dermatomyositis, high doses of corticosteroids are often the first line of treatment.
Physical therapy
Gentle stretching can help prevent stiffness and restore blood flow to sore muscles. Massage therapy can also be beneficial in relieving tension and promoting blood flow. Cold therapy, such as ice packs or cold baths, can reduce inflammation and swelling for recent injuries or acute pain. On the other hand, heat therapy, including heat wraps or warm baths, can be effective for older injuries or general tension by relaxing the muscles and improving blood flow.
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Frequently asked questions
Inflamed muscles are muscles that are swollen, irritated, and painful. This is often referred to as myositis, which is an autoimmune disease characterised by inflammation of the muscles.
The symptoms of an inflamed muscle include muscle weakness, fatigue, and pain. In some cases, there may also be a skin rash. The most common muscles to be affected are those around the shoulders, hips, and thighs.
Inflamed muscles can be caused by a variety of factors, including injury, infection, or autoimmune disease. In some cases, they may be caused by a virus or an allergic reaction to medication. People of Sub-Saharan African descent are three times more likely to get inflamed muscles than other ethnic groups.
