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Autoimmune diseases occur when the body's immune system attacks itself, causing damage instead of protection. There are over 100 types of autoimmune diseases, and they can affect almost any tissue or organ in the body. One such disease is myositis, a rare autoimmune disease that causes chronic inflammation and weakening of muscle fibres, resulting in muscle pain and tenderness. Myositis can affect muscles in the neck, shoulders, hips, back, arms, and legs, leading to difficulty in movement and performing daily activities. While the specific causes of myositis are unknown, it often occurs alongside other autoimmune conditions and can be triggered by various factors. Treatment options are available to manage symptoms and slow the progression of the disease.
| Characteristics | Values |
|---|---|
| Name of Autoimmune Disease | Myositis, also called large-histiocyte-related immune myopathy, or Polymyositis (if there is no skin involvement) or Dermatomyositis (if there is skin involvement) |
| Prevalence | About 75,000 U.S. residents live with myositis |
| Symptoms | Muscle pain, weakness, inflammation, tenderness, trouble swallowing, difficulty talking, trouble breathing, shortness of breath, fatigue, joint pain, stiffness, weight loss, difficulty moving, skin rashes, arrhythmia, difficulty raising arms above the head, difficulty rising from a chair |
| Diagnosis | Physical exam, blood tests, muscle magnetic resonance imaging (MRI), electromyogram, nerve conduction velocity studies, muscle biopsy |
| Treatment | Immunomodulating therapy such as steroids, immunosuppressing drugs, anti-inflammatory drugs, physical therapy, speech therapy, diet changes, emotional support |
| Similar Diseases | Lupus, Sjogren's, scleroderma, dermatomyositis, rheumatoid arthritis, Raynaud's disease |
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What You'll Learn
- Myositis: an autoimmune disease causing inflammation and weakening of muscle fibres
- Polymyositis: a rare disease causing immune system attack on muscles
- Dermatomyositis: a form of myositis that affects the skin and muscles
- Large-histiocyte-related immune myopathy: a rare disease involving immune attack on muscle fibres
- Other autoimmune conditions: Lupus, Sjogren's, scleroderma, and rheumatoid arthritis
Myositis: an autoimmune disease causing inflammation and weakening of muscle fibres
Autoimmune diseases are chronic conditions that occur when the immune system malfunctions and attacks the body instead of defending it. There are over 100 types of autoimmune diseases, and they can affect almost any tissue or organ in the body.
Myositis is an autoimmune disease that causes chronic inflammation and the weakening of muscle fibres. It is a type of myopathy, which refers to diseases that affect the muscles connected to bones or skeletal muscles. Myositis makes the immune system attack the muscles, causing inflammation that comes and goes over a long period. This inflammation leads to muscle weakness and pain. The most common muscles affected are those around the shoulders, hips, thighs, neck, and back.
There are several types of myositis, including polymyositis, dermatomyositis, and inclusion body myositis. Polymyositis affects multiple muscles simultaneously, usually those near the centre of the body, and can cause difficulty with everyday movements such as standing up, climbing stairs, or lifting objects. Dermatomyositis affects the skin and muscles, causing similar symptoms to polymyositis, as well as a skin rash. Inclusion body myositis causes muscle weakness, usually in the arms and legs, leading to difficulty with gripping objects or walking.
Myositis can also affect breathing and swallowing, and in rare cases, it may cause weakening of the heart. There is currently no cure for myositis, but treatments such as corticosteroids, immunosuppressants, and intravenous immunoglobulin can help manage symptoms and put the disease into remission.
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Polymyositis: a rare disease causing immune system attack on muscles
Autoimmune diseases occur when the immune system, which is meant to protect the body, malfunctions and attacks it instead. There are over 100 types of autoimmune diseases, and they can affect almost any tissue or organ in the body. These diseases can cause a wide range of symptoms, including muscle weakness, joint pain, swelling, stiffness, and inflammation.
One such autoimmune disease is polymyositis, a rare disease that causes the immune system to attack the muscles. It is a type of myositis, which is a group of diseases that cause chronic inflammation and weakening of muscles over time. Polymyositis affects multiple muscles simultaneously, usually those near the center of the body, including the hips, shoulders, thighs, upper arms, upper back, and neck. The condition can make even simple movements difficult, such as standing up after sitting, climbing stairs, lifting objects, or reaching overhead.
The symptoms of polymyositis include muscle weakness, pain, and trouble swallowing. It can also lead to weight loss, malnutrition, and respiratory failure if the muscles in the digestive tract and chest wall are affected. The disease typically develops gradually, and females are twice as likely to develop it as males. While there is no cure for polymyositis, treatments are available to manage the symptoms and reduce their impact on daily life. These treatments include anti-inflammatory medicines, immunosuppressive medicines, physical therapy, and speech therapy.
Polymyositis can be challenging to diagnose, as it often mimics or overlaps with other autoimmune diseases, such as Lupus, Sjogren's, and scleroderma. Doctors use a combination of medical history, physical exams, and tests to confirm the diagnosis. Blood tests, muscle biopsies, MRIs, and electromyograms are some of the tools used to identify polymyositis and rule out other conditions.
While the exact cause of polymyositis is unknown, it is believed to be triggered by environmental factors, infectious organisms, certain drugs, or even cancer. It is estimated that fewer than 25 out of every 100,000 people are affected by polymyositis each year.
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Dermatomyositis: a form of myositis that affects the skin and muscles
Dermatomyositis is a form of myositis, an autoimmune disease that inflames and weakens muscle fibres. Autoimmune diseases occur when the body's immune system attacks itself. In the case of dermatomyositis, the immune system attacks healthy muscle tissue, resulting in inflammation, swelling, pain, and eventual weakness. Dermatomyositis affects the skin in addition to the muscles.
Myositis is a rare disease that affects the muscles connected to bones (skeletal muscles). Different forms of myositis affect different groups of muscles throughout the body. Myositis usually affects the muscles used for movement, such as the arms, shoulders, legs, hips, abdomen, and spine. It can also cause muscle pain, tenderness, and weakness. Some people with myositis experience muscle weakness in their arms, making it difficult to raise them above the head or rise from a chair. It can also affect the lungs, causing difficulty breathing, and the throat, causing difficulty swallowing.
Dermatomyositis is characterised by skin involvement, which can manifest as rashes. It can develop quickly, and early treatment is essential to avoid severe complications. Myositis can be challenging to diagnose due to its similarity to other autoimmune diseases like lupus, Sjogren's syndrome, and scleroderma. Doctors use various tests, including blood tests, muscle magnetic resonance imaging (MRI), and electromyography, to confirm the diagnosis.
There is currently no cure for dermatomyositis or myositis in general. However, treatment can help manage symptoms and put the disease into remission. Treatment options include physical therapy, speech therapy, diet changes, emotional support, and immunosuppressing drugs. Starting treatment as soon as symptoms appear can minimise complications and slow down the progression of the disease.
It is important to note that dermatomyositis is a rare condition, and further research is needed to fully understand its causes and improve diagnosis and treatment.
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Large-histiocyte-related immune myopathy: a rare disease involving immune attack on muscle fibres
Autoimmune diseases occur when the immune system attacks the body's own tissues and organs instead of protecting them. There are more than 100 types of autoimmune diseases, and they can affect almost any part of the body. These diseases can cause a wide range of symptoms, including muscle weakness and joint pain.
One example of an autoimmune disease is myositis, a rare disease that involves the immune system attacking the muscles, leading to chronic inflammation and muscle weakness. This can cause pain and make it difficult to move or perform everyday activities. There are different forms of myositis, including polymyositis and dermatomyositis, and it often takes years for patients to receive a proper diagnosis due to its similarity to other autoimmune diseases.
Large-histiocyte-related immune myopathy (LHIM) is a rare and distinctive type of acquired myopathy characterised by scattered necrotic muscle fibres surrounded by large, multinucleated histiocytic cells. This condition results in muscle pain and proximal, symmetric weakness in the arms and legs, which can progress to moderate disability over 1 to 4 weeks. Patients with LHIM also present with very high serum creatine kinase (CK) levels, ranging from 10,000 to 102,000 U/L.
LHIM is distinguished from other myopathies by the presence of large histiocytic cells adjacent to necrotic muscle fibres, indicating an ongoing process rather than a monophasic one. It is often associated with concurrent systemic disorders, such as anemia, and may be a subset of macrophage activation syndromes. Treatment for LHIM has shown improvement within 3 months, with reduced symptoms and decreased CK levels.
In conclusion, large-histiocyte-related immune myopathy is a rare disease where the immune system attacks muscle fibres, resulting in muscle pain, weakness, and disability. While treatment options are available, further research is needed to fully understand this distinctive form of acquired myopathy.
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Other autoimmune conditions: Lupus, Sjogren's, scleroderma, and rheumatoid arthritis
Myositis is an autoimmune disease that causes muscle pain and inflammation. It is a type of myopathy, which refers to diseases that affect the muscles connected to bones. Myositis usually affects the muscles used for movement, including the arms, shoulders, legs, hips, abdomen, and spine. It can also cause muscle weakness and difficulty breathing or swallowing.
Myositis can be difficult to diagnose as it mimics other autoimmune diseases, including Lupus, Sjogren's, scleroderma, and rheumatoid arthritis. People with myositis may also have these other autoimmune conditions. Lupus, Sjogren's, and dermatomyositis (a form of myositis that affects the skin) can cause photosensitivity, which requires diligent sunscreen use.
Polymyositis is a type of myositis that affects multiple muscles simultaneously, causing muscle weakness, pain, and trouble swallowing. It usually affects muscles near the center of the body and can lead to severe, life-threatening complications. Dermatomyositis is another form of myositis that affects the skin in addition to the muscles. It can develop quickly, so early treatment is essential to prevent severe complications.
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Frequently asked questions
Myositis is a rare autoimmune disease that causes chronic inflammation and weakness in muscles. It occurs when the body's immune system attacks healthy muscle tissue, resulting in inflammation, swelling, pain, and eventual weakness.
The symptoms of myositis include muscle pain and tenderness, trouble swallowing, difficulty talking, shortness of breath, fatigue, joint pain, stiffness, and weight loss. Myositis usually affects the muscles used for movement, including the arms, shoulders, legs, hips, abdomen, and spine.
Myositis is diagnosed based on symptoms and the location of affected muscles. Blood tests, muscle magnetic resonance imaging (MRI), electromyography (EMG), and muscle biopsies can help confirm the diagnosis.
There is currently no cure for myositis, but treatment can help manage symptoms and put the disease into remission. Treatment options include physical therapy, speech therapy, diet changes, and emotional support.
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