Dominic Stone
Autoimmune diseases can cause muscle weakness. Myositis, for example, is a rare autoimmune disease that causes profound muscle weakness. Another example is polymyositis, which causes muscles to become irritated and
| Characteristics | Values |
|---|---|
| Name of the autoimmune disease | Myositis, Polymyositis, Dermatomyositis, Inclusion body myositis, Large-histiocyte-related immune myopathy |
| Symptoms | Muscle weakness, Muscle pain, Trouble swallowing, Difficulty talking, Trouble breathing, Fatigue, Joint pain, Stiffness, Weight loss, Malnutrition, Rash, Inflammation |
| Diagnosis | Muscle and skin biopsies, Blood tests, Electromyogram, MRI, Physical exam |
| Treatment | Corticosteroids, Immunosuppressants, Immunoglobulin, Anti-inflammatory drugs, Immunomodulating therapy, Exercise |
| Prevention | No known prevention |
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What You'll Learn
- Myositis: A rare autoimmune disease causing muscle weakness
- Polymyositis: Inflammation and weakness in muscles close to the body's centre
- Dermatomyositis: Skin changes and calcium deposits in muscles
- Antisynthetase syndrome: Symptoms include inflammatory arthritis, fever, lung disease
- Immune-mediated necrotizing myopathies: Rapidly progressive muscle weakness
Myositis: A rare autoimmune disease causing muscle weakness
Myositis is a rare autoimmune disease that causes muscle weakness. It makes it hard or impossible to use the affected muscles. The disease is characterised by chronic inflammation, which comes and goes over a long time, eventually making the muscles feel weak. The muscle inflammation is caused by the immune system losing tolerance of the muscle. The immune system starts attacking the muscle with immune cells and other inflammatory mediators, causing the muscles to become inflamed.
There are a few different forms of myositis, including polymyositis, dermatomyositis, and inclusion body myositis. Polymyositis is the most common form, affecting multiple muscles simultaneously, usually those near the centre of the body, such as the neck, shoulders, hips, and back. It can cause muscle pain and tenderness, trouble swallowing (dysphagia), difficulty talking, shortness of breath (dyspnea), fatigue, joint pain, stiffness, and weight loss. Some polymyositis symptoms can cause life-threatening complications, so it is important to seek medical attention if experiencing any of these symptoms.
Dermatomyositis and inclusion body myositis are less common forms of myositis. Dermatomyositis often presents with a distinctive rash on the face and hands, in addition to muscle weakness. Inclusion body myositis typically affects older adults and is characterised by muscle weakness in the arms and thighs, as well as potential finger weakness and atrophy.
Myositis can be challenging to diagnose because it mimics other autoimmune diseases like Lupus, Sjogren's, and scleroderma. A physical exam and medical history are typically the first steps in diagnosis, followed by specific tests to confirm the condition. Blood tests can check for muscle enzymes (CK, aldolase, LDH) and antibodies associated with myositis. Diagnostic tests may also include muscle magnetic resonance imaging (MRI), electromyogram, and nerve conduction velocity studies. Muscle and skin biopsies are considered the most definitive tests for diagnosing myositis.
Currently, there is no cure for myositis, but treatments can help manage symptoms and induce remission. Off-label medications such as corticosteroids, immunosuppressants, and immunoglobulin have been successful in controlling inflammation. Exercise and physical therapy are also crucial components of treatment, helping to reduce muscle inflammation and fatigue while increasing stamina and muscle mass.
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Polymyositis: Inflammation and weakness in muscles close to the body's centre
Autoimmune diseases occur when the immune system attacks the body instead of protecting it. One such disease is myositis, a rare autoimmune disease that causes profound muscle weakness. Myositis can mimic other autoimmune diseases, making it hard to diagnose. It has no known cure, but it can be managed with medications and exercise.
Polymyositis is a type of myositis that causes inflammation and weakness in muscles close to the body's centre. It can affect muscles all over the body, making even simple movements difficult. The exact cause of polymyositis is unknown, but it is believed to be triggered by a virus or an autoimmune reaction. It can also be caused by certain medications. Polymyositis is most common in adults aged 30 to 60 and is more prevalent in females.
The symptoms of polymyositis include muscle weakness, pain, and tenderness. Individuals may experience trouble swallowing, speaking, and breathing. Other symptoms include fatigue, joint pain, stiffness, and weight loss. If left untreated, polymyositis can lead to severe, life-threatening complications, including respiratory failure, malnutrition, and weight loss.
Polymyositis is diagnosed through a physical exam and various tests. Blood tests are conducted to check for muscle inflammation and abnormal proteins associated with autoimmune diseases. Electromyograms (EMG) are used to detect abnormal electrical activity in muscles, while muscle magnetic resonance imaging (MRI) helps visualise inflammation. Muscle and skin biopsies are considered the most definitive tests for diagnosis.
While there is no cure for polymyositis, it can be managed with medications and exercise. Corticosteroids, immunosuppressants, and immunoglobulin are used to control inflammation and suppress immune activity. Exercise is crucial for successful treatment, helping to reduce muscle inflammation and fatigue while increasing stamina and muscle mass.
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Dermatomyositis: Skin changes and calcium deposits in muscles
Dermatomyositis is a type of myositis, a rare autoimmune disease that causes muscle weakness. Myositis is characterised by profound muscle weakness and is the result of the immune system attacking muscles throughout the body. This chronic inflammation causes muscles to feel weak and can also lead to muscle pain.
Dermatomyositis is characterised by skin changes and calcium deposits in the muscles. In children, and occasionally in adults, dermatomyositis causes calcium to collect in or under the skin, in muscles or tendons. This complication is called calcinosis. Dermatomyositis usually causes skin changes that help doctors differentiate it from other inflammatory myopathies.
Myositis is often difficult to diagnose as it mimics other autoimmune diseases, such as Lupus, Sjogren's and scleroderma. It can take years for a proper diagnosis to be made. Doctors will usually perform a physical exam, assessing muscle strength and rashes, and may order blood tests to check for certain muscle enzymes and antibodies associated with myositis.
There is currently no cure for myositis, but treatments can induce remission or control symptoms by tackling inflammation. These include corticosteroids, immunosuppressants and immunoglobulin. Exercise is also critical for successful treatment, helping to reduce muscle inflammation and fatigue, and increase stamina and muscle mass.
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Antisynthetase syndrome: Symptoms include inflammatory arthritis, fever, lung disease
Autoimmune diseases are conditions in which the immune system mistakenly attacks the body's own tissues and organs. One such disease is antisynthetase syndrome, a rare condition where the immune system attacks healthy tissue. This can lead to a range of symptoms, including inflammatory arthritis, fever, and lung disease.
Antisynthetase syndrome is characterised by a group of rare autoimmune rheumatic disorders that cause inflammation and damage to various parts of the body, particularly the muscles, joints, and lungs. The syndrome is believed to be caused by specific antibodies in the blood that target synthetase enzymes, which are crucial for protein production in cells. This results in a range of symptoms that can vary greatly from person to person.
One of the most common symptoms of antisynthetase syndrome is inflammatory arthritis, specifically polyarthritis, which affects five or more joints simultaneously. Individuals with antisynthetase syndrome may experience joint pain, stiffness, and swelling in the affected joints. This can lead to difficulty moving and performing daily activities.
Fever is another frequent symptom of antisynthetase syndrome. Individuals may experience low-grade fevers that are not caused by an infection or any other identifiable reason. This is often accompanied by other nonspecific symptoms such as fatigue, unintended weight loss, and cognitive dysfunction, also known as "brain fog."
Lung disease, specifically interstitial lung disease (ILD), is a significant feature of antisynthetase syndrome. ILD damages the tissues between the small air sacs in the lungs (alveoli) and the surrounding blood vessels, leading to shortness of breath, dry cough, fatigue, and chest discomfort. In severe cases, progressive damage to the lungs can result in respiratory insufficiency, requiring oxygen treatment. Lung disease, arthritis, and muscle disease are considered the classic triad of symptoms of antisynthetase syndrome.
While there is no cure for antisynthetase syndrome, treatments are available to manage symptoms and minimise damage to organs. These treatments include corticosteroids to relieve pain and reduce swelling, immunosuppressants to prevent the immune system from damaging healthy cells, and specific medications or oxygen therapy to improve breathing in the case of lung disease.
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Immune-mediated necrotizing myopathies: Rapidly progressive muscle weakness
Autoimmune diseases can cause muscle weakness. One example of an autoimmune disease that causes muscle weakness is myositis, a rare disease where the immune system attacks the muscles, causing chronic inflammation and pain. This inflammation results in profound muscle weakness, making it difficult or impossible to use the affected muscles.
Immune-mediated necrotizing myopathy (IMNM), also known as necrotizing autoimmune myopathy (NAM) or necrotizing myopathy (NM), is an inflammatory muscle disease characterised by necrosis or cell death in the muscles. This results in symmetrical muscle weakness on both sides of the body, primarily affecting proximal muscles closest to the centre, such as the shoulders, forearms, hips, thighs, neck, and back. The onset of IMNM is relatively rapid, occurring over days, weeks, or months, and typically affects adults between 40 and 60 years of age, with a range of 30 to 70. While the cause and cure for IMNM are unknown, treatments are available to manage symptoms.
The hallmark feature of IMNM is severe proximal muscle weakness, with little effect on other parts of the body. Patients may experience difficulty in activities such as standing up after sitting, climbing stairs, lifting objects, or reaching overhead. In some cases, there may also be trouble swallowing, breathing, talking, skin rashes, and joint pain.
Diagnosis of IMNM involves detecting muscle-specific auto-antibodies, such as anti-SRP or anti-HMGCR, through blood tests and muscle biopsies to confirm the presence of necrosis. Magnetic resonance imaging (MRI) may also reveal muscle damage and inflammation. Treatment strategies include long-term immunosuppressive therapies, combining high-dose corticosteroids with other immunosuppressive agents, followed by maintenance therapy to control the disease. Exercise is recommended to improve muscle strength and prevent muscle atrophy.
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Frequently asked questions
Myositis is a rare autoimmune disease that causes muscle weakness. It makes it hard or impossible to use your affected muscles.
Symptoms of myositis include muscle weakness, pain, trouble swallowing, difficulty talking, trouble breathing, stiffness, weight loss, and fatigue.
There is no cure for myositis, but treatments can put it into remission. Treatments include off-label medications such as corticosteroids, immunosuppressants, and immunoglobulin. Exercise is also critical for successful treatment.
