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Myositis is a rare condition that causes muscles to become weak, tired, and painful. It is an autoimmune disease that causes the immune system to attack muscles, resulting in inflammation. This inflammation can lead to swelling, tenderness, and weakness in the muscles. Myositis can be caused by various factors, including viral infections, autoimmune conditions, genetic disorders, medication side effects, and injuries. Viral myositis, in particular, is associated with viruses such as influenza, HIV, hepatitis, and enteroviruses. The treatment for viral myositis depends on the specific virus and usually overlaps with treating the initial infection.
| Characteristics | Values |
|---|---|
| Name | Myositis |
| Definition | Inflammation of a muscle, especially a voluntary muscle, characterized by pain, tenderness, swelling, and/or weakness |
| Causes | Viral, bacterial, fungal, parasitic, autoimmune conditions, genetic disorders, medication adverse events, electrolyte disturbances, diseases of the endocrine system, trauma, surgery, intense exercise, etc. |
| Viral Causes | Influenza virus, HIV, HTLV-1, hepatitis viruses (B and C), coronavirus, enteroviruses, adenoviruses, cytomegalovirus, Epstein-Barr virus, Torque teno virus, parvovirus B19, arboviruses, coxsackievirus, picornavirus, etc. |
| Symptoms | Muscle pain, muscle weakness, muscle tenderness, muscle swelling, muscle fatigue, muscle stiffness, muscle edema, rhabdomyolysis, fever, skin rashes, joint pain, trouble breathing or swallowing, arrhythmia, etc. |
| Treatment | Immunosuppressant drugs, antibiotics, IV fluids, exercise, rest, etc. |
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What You'll Learn
Myositis symptoms and causes
Myositis is a rare group of diseases characterised by inflamed muscles, which can cause prolonged muscle fatigue and weakness. It is an autoimmune disease that causes the immune system to attack muscles. It usually affects several muscles simultaneously, especially those near the body's centre, such as arms, hips, thighs, chest, back, neck, and abdomen.
Symptoms
The symptoms of myositis vary across individuals and depend on which type of myositis is present. The main symptom of myositis is muscle weakness, which can start very gradually and cause tripping or falling. Other symptoms include muscle pain, swelling of joints, stiffness, fever, fatigue, trouble swallowing, and breathing difficulties. In some cases, patients may also experience lung disease, arthritis, Raynaud's phenomenon, and "mechanic's hands" (thickening of the skin on the palms and fingers).
Dermatomyositis, a form of myositis, can cause a patchy red rash, usually on the eyelids, face, neck, and the backs of the hands. This rash can appear different on brown or black skin. Inclusion body myositis, another type of myositis, causes muscle weakness in the extremities, such as the hands and legs below the knees, and can affect the muscles in the throat, making swallowing difficult.
Causes
The exact cause of myositis is not fully understood, but it is believed to be an autoimmune condition where the body's immune system attacks its own muscles, causing inflammation. Myositis can be caused by viral and bacterial infections, with viruses like the common cold, flu, and HIV being potential triggers. In rare cases, myositis can also be caused by certain medications that lead to temporary muscle damage. Intense exercise can also trigger muscle inflammation and pain, constituting a mild form of myositis that usually resolves with rest.
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Viral myositis treatment
Benign acute childhood myositis, also known as viral myositis, is a muscle inflammation caused by a virus. It is a common cause of muscle pain in children and usually occurs a few days after a viral infection. The influenza virus is the most common cause of viral myositis, but it can also be caused by the common cold, HIV, and hepatitis C.
Viral myositis causes calf muscle pain and difficulty walking in children. Symptoms usually improve within three to seven days, and children fully recover. Treatment for viral myositis includes pain medication, such as acetaminophen, and ensuring the patient drinks lots of fluids to help their kidneys clear muscle enzymes.
Myositis is an autoimmune disease that causes the immune system to attack the muscles, resulting in chronic inflammation. This inflammation causes muscle weakness and pain. There is no cure for myositis, but treatment can put it into remission. The best treatment depends on the cause of the myositis. If it is due to an inflammatory condition, drugs that suppress the immune system may be prescribed. If it is caused by a bacterial infection, antibiotics are used to stop the infection from spreading. In the case of viral myositis, treatment overlaps with the treatment of the initial viral infection.
Glucocorticoid (GC) in high doses is the first-line treatment for myositis. It is recommended to combine GCs with another immunosuppressive agent to better control disease activity and reduce the risk of side effects. Combining pharmacological treatment with individualized and supervised exercise is also recommended. In the case of benign acute childhood myositis, the annual flu shot can help prevent infections due to influenza.
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Myositis diagnosis
Myositis is an inflammatory condition that affects the muscles, causing chronic inflammation and pain and leading to muscle weakness. It is an autoimmune disease where the immune system attacks its own tissue, usually affecting several muscles simultaneously. There are several types of myositis, including sporadic inclusion body myositis (the most common form), dermatomyositis, and polymyositis.
Diagnosing myositis can be challenging due to its rarity and diverse symptoms, which often mimic other autoimmune diseases. The diagnostic process typically involves a comprehensive physical exam, blood tests, and neurological tests such as electromyography (EMG) or nerve conduction velocity (NCV) studies. Magnetic resonance imaging (MRI) may also be used to visualize muscle inflammation and damage. However, the most definitive test for myositis is a muscle or skin biopsy, which can reveal inflammation, damage, and abnormal proteins in muscle tissue. Biopsies are particularly useful in cases of dermatomyositis, which affects both the skin and muscles, often presenting with a rash.
Given the complexity of diagnosing myositis, early consultation with a rheumatologist or a specialist is essential. Early and aggressive treatment is crucial to preserving muscle mass and function. While there is currently no cure for myositis, treatment can induce remission in most cases.
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Myositis triggers
Myositis is a rare disease that causes the immune system to attack the muscles, resulting in chronic inflammation, swelling, pain, and weakness. It can affect both children and adults, and there is currently no cure. The exact cause of myositis is unknown, but it is believed to have a strong genetic component and is often passed down from parents.
There are several types of myositis, including polymyositis, dermatomyositis, inclusion body myositis, and juvenile myositis. Each type affects different groups of muscles throughout the body. Polymyositis typically affects multiple muscles simultaneously, especially those near the center of the body, such as the arms, hips, thighs, chest, back, neck, and abdomen. Dermatomyositis impacts the skin and muscles, causing skin rashes that may appear as red or purple spots. Inclusion body myositis usually affects people over 50 and causes muscle weakness in the extremities, such as the hands and legs. Juvenile myositis occurs in children under 18, with girls being twice as likely to develop it as boys.
Myositis can be triggered by various factors, one of the most common being viral infections. Viruses associated with myositis include the common cold and flu viruses, HIV, hepatitis C, and coxsackievirus. When myositis is caused by an infection, it often doesn't require specific treatment beyond addressing the initial infection. In addition to viral infections, certain medications and drugs can also trigger myositis by causing temporary muscle damage. Intense exercise can lead to a mild form of myositis, resulting in muscle pain, swelling, and weakness that usually resolves with rest and recovery.
The treatment options for myositis focus on managing symptoms and include medications such as corticosteroids and immunosuppressants, as well as physical therapy and regular exercise to strengthen the affected muscles. While there is no cure, treatment can effectively control myositis and induce remission in most cases.
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Myositis types
Myositis is a type of myopathy, a general term for diseases that affect the muscles connected to bones (skeletal muscles). It is an autoimmune disease that causes the immune system to attack the muscles, leading to chronic inflammation, muscle weakness, pain, and swelling. While there is no cure for myositis, treatment can help manage symptoms and induce remission. The best treatment approach depends on the underlying cause.
There are several types of myositis, each affecting different muscle groups in the body:
Polymyositis
Polymyositis affects multiple muscles simultaneously, usually those near the center of the body, such as the arms, hips, thighs, chest, back, neck, and abdomen. It causes muscle weakness that worsens over time, making it difficult to perform everyday tasks like standing up, climbing stairs, or lifting objects. Polymyositis typically occurs in adults, with females being twice as likely to develop it than males.
Dermatomyositis
Dermatomyositis affects both the muscles and the skin. It causes muscle weakness and is accompanied by a distinctive rash on the eyelids, cheeks, nose, back, upper chest, elbows, knees, and/or knuckles. Dermatomyositis can develop quickly or slowly, and it has been found to be more prevalent in African-American women.
Inclusion Body Myositis (IBM)
Inclusion Body Myositis is a degenerative muscle disease that usually affects people over 50. It causes muscle weakness in the extremities, including the hands and legs, and can also impact the muscles in the throat, leading to difficulty swallowing (dysphagia). IBM is the most common form of myositis in older adults.
Juvenile Myositis (JM)
Juvenile Myositis refers to any form of myositis found in children under 18. It typically presents as dermatomyositis or polymyositis, with additional symptoms like trouble lifting the head, a hoarse voice, stomach aches, hardened lumps under the skin, and irritability.
Immune-Mediated Necrotizing Myopathy (IMNM) or Necrotizing Autoimmune Myopathy (NAM)
IMNM, also known as NAM, is a rare autoimmune disease with symptoms similar to polymyositis. It involves muscle weakness and evidence of muscle cell death (necrosis).
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Frequently asked questions
A muscle virus, or viral myositis, is an illness characterised by muscle weakness, pain, and inflammation. It is caused by direct infection of the muscle or the ensuing inflammatory response.
Symptoms of a muscle virus include muscle tenderness, swelling, weakness, pain, and fatigue. In some cases, a skin rash may also be present.
Muscle viruses can be caused by a variety of viruses, including influenza, HIV, hepatitis, coronavirus, and adenoviruses.
Treatment for a muscle virus depends on the specific cause of the infection. In some cases, the treatment may overlap with the treatment for the initial infection. For example, bacterial myositis may be treated with antibiotics, while viral myositis may be treated with drugs that suppress the immune system.
It is unclear how common muscle viruses are, but they are considered rare conditions.
