
Muscle inflammation, or myositis, is a rare condition that causes muscles to become weak, tired, and painful. It is caused by the immune system attacking muscles throughout the body. Myositis can be triggered by infection, injury, autoimmune conditions, or drug side effects. The inflammation caused by myositis often leads to swelling, which can be identified through an MRI. While there is no cure for myositis, treatments such as corticosteroids, immunosuppressants, and physical therapy exercises can help manage symptoms and bring the disease into remission.
| Characteristics | Values |
|---|---|
| What is muscle inflammation called? | Myositis |
| What causes muscle inflammation? | Triggered by infection, injury, autoimmune conditions, or drug side effects |
| What are the symptoms of muscle inflammation? | Muscle weakness, pain, swelling, stiffness, fatigue, tenderness, redness, rash, difficulty swallowing, difficulty breathing |
| How is muscle inflammation treated? | Corticosteroids, immunosuppressants, intravenous immunoglobulin, physical therapy, rest, massage, cold therapy, anti-inflammatory diet |
| What are the diagnostic tests for muscle inflammation? | Ultrasound, MRI, electrodiagnostics, electromyograph (EMG) test, nerve conduction study (NCS) |
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What You'll Learn

Myositis: a group of conditions causing muscle inflammation
Myositis is a rare disease that causes chronic inflammation of the muscles. It is characterised by muscle weakness, swelling, and pain, which can make everyday activities difficult. The condition can affect people of all ages, including children, and there is currently no cure.
The inflammation in myositis is caused by white blood cells of the immune system attacking healthy muscle fibres. This can lead to muscle injury and fatigue, and in some cases, can result in permanent damage. While the exact causes of myositis are unknown, it is believed to be triggered by factors such as infection, injury, autoimmune conditions, or drug side effects.
There are several types of myositis, including polymyositis, dermatomyositis, inclusion body myositis (IBM), and necrotizing autoimmune myopathy. Polymyositis affects multiple muscles and typically doesn't impact other parts of the body. Dermatomyositis causes similar muscle symptoms but is also characterised by a skin rash. IBM results in muscle weakness and can make tasks like gripping objects or swallowing challenging. Necrotizing autoimmune myopathy leads to muscle cell death and direct muscle damage, causing a slow breakdown of muscles over time.
The diagnosis of myositis can be challenging, and it may take time to receive a proper diagnosis. Doctors may use tools such as ultrasounds, MRIs, and electrodiagnostic tests to detect evidence of inflammation and muscle injury associated with myositis. Treatment options include corticosteroids, immunosuppressants, intravenous immunoglobulin, and physical therapy exercises to manage symptoms and prevent future episodes.
While severe cases of myositis can be fatal, most people can manage the condition with treatment. It is important to seek medical attention if you experience symptoms of muscle inflammation or pain, as early diagnosis and treatment can improve outcomes.
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Anti-synthetase syndrome: inflammation affecting muscles, skin, and lungs
Muscle inflammation, or myositis, is caused by white blood cells of the immune system attacking muscle fibres and can lead to muscle weakness, pain, and swelling.
Anti-synthetase syndrome
Anti-synthetase syndrome is a rare condition where the immune system attacks the body, causing inflammation in the muscles, skin, and lungs. It is characterised by the presence of autoantibodies that target specific proteins in the body, namely aminoacyl-tRNA synthetase enzymes. The exact role of these autoantibodies in the development of the syndrome is not fully understood. The symptoms and severity of the disorder vary among individuals.
Symptoms
The symptoms of anti-synthetase syndrome include:
- Interstitial lung disease, which causes coughing, shortness of breath, and progressive scarring and inflammation of the lungs.
- Mechanic's hands, which is a thickening and cracking of the skin on the palms and sides of the fingers.
- Polyarthritis, or arthritis affecting five or more joints at the same time, causing pain, stiffness, and swelling.
- Raynaud's phenomenon, which causes colour changes and numbness in the fingertips and toes in response to cold.
- Muscle inflammation (myositis) causing muscle pain and weakness.
Diagnosis
Diagnosis of anti-synthetase syndrome is based on the identification of characteristic symptoms, patient history, clinical evaluation, and tests that confirm the presence of autoantibodies. Pulmonary function tests, imaging tests, electromyography, and muscle or lung tissue biopsies may be used to check for inflammation and assess the severity of the disease.
Treatment
There is currently no cure for anti-synthetase syndrome, but treatments are available to manage symptoms and reduce their impact on daily life. Initial treatments typically include corticosteroids, which address inflammation and help suppress the overactive immune system. Additional immunosuppressive drugs may be added to the treatment regimen.
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Rhabdomyolysis: a rare complication of myositis
Muscle inflammation, or myositis, is a group of rare conditions that cause muscles to become weak, tired, and painful. Myositis can be caused by infection, injury, autoimmune conditions, or drug side effects, though experts are unsure of the exact causes. The inflammation caused by myositis can lead to swelling, which can be observed through an MRI.
Rhabdomyolysis is a rare but serious complication of myositis. It occurs when muscles break down quickly, often after a major injury or extreme exercise. This condition can lead to permanent kidney damage, and people with rhabdomyolysis are usually hospitalized and treated with large amounts of IV fluids. Those with myositis are at an increased risk of developing rhabdomyolysis.
Myositis is caused by the white blood cells of the immune system attacking healthy muscle fibres, injuring or destroying them. This leads to muscle weakness and fatigue. The inflammation caused by myositis can result in swelling, which is a sign of the body healing itself. However, inflammation can be harmful if it occurs in healthy tissues or persists for too long.
Myositis can affect people of all ages, including children, though it is more common in middle-aged people, women, and those with Sub-Saharan African descent. The main muscles affected are those around the shoulders, hips, and thighs. Myositis can also impact other parts of the body, such as the skin, lungs, or heart, and may affect functions like breathing and swallowing.
There is no cure for myositis, but treatments can help manage symptoms and induce remission. Treatments include corticosteroids, immunosuppressants, and intravenous immunoglobulin, along with physical therapy exercises to maintain muscle flexibility and strength. While myositis usually persists for life, it can be managed through proper medical care and treatment.
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Treatment: corticosteroids, immunosuppressants, and physical therapy
Muscle inflammation, or myositis, often leads to swelling, pain, and weakness, making everyday activities difficult. While there is no cure for myositis, treatments can help ease the symptoms. The best treatment depends on the underlying cause, which could be an injury, infection, autoimmune condition, or drug side effect.
Corticosteroids
Corticosteroids (glucocorticoids) are prescription medications that treat the pain and inflammation caused by injuries and various health conditions. They are one of the fastest ways to reduce inflammation in the body. They can be administered through intramuscular injections, offering quick relief from pain, swelling, and other symptoms. Corticosteroids can also provide long-lasting pain relief, with cortisone shots managing symptoms for months or even permanently. However, they do carry the risk of side effects, especially with long-term use, including muscle weakness, mood swings, increased body hair, Cushing syndrome, high blood pressure, osteoporosis, and infections.
Immunosuppressants
Immunosuppressants are used to keep the immune system in check and prevent it from attacking healthy tissues and organs. They are commonly used after organ transplants to prevent rejection and in autoimmune diseases such as inflammatory bowel disease, rheumatoid arthritis, and multiple sclerosis. Different types of immunosuppressants include biologics, calcineurin inhibitors, inosine monophosphate dehydrogenase (IMDH) inhibitors, and Janus kinase inhibitors. The specific medication or combination of immunosuppressants is tailored to the patient's condition and symptoms.
Physical Therapy
Physical therapists commonly treat patients with musculoskeletal injuries, which often involve inflammatory responses. The aim of physical therapy treatments is to reduce clinical signs of inflammation, such as swelling, pain, and loss of function. While human studies are more easily transferable to physical therapy practices, animal and cellular studies have also contributed to our understanding of the inflammatory process and the development of experimental models.
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Symptoms: swelling, pain, weakness, and stiffness
Muscle inflammation, or myositis, is caused by white blood cells of the immune system attacking muscle fibres and can lead to muscle weakness, swelling, and pain. Myositis can be triggered by infection, injury, autoimmune conditions, or drug side effects. Symptoms of muscle inflammation include swelling, pain, weakness, and stiffness.
Swelling is often a result of muscle injury, where the muscle holds on to water, causing inflammation and pain. This can be treated with cold therapy, such as ice packs or cold baths, which help to reduce inflammation and swelling. Swelling can also be caused by more serious conditions, such as muscle compartment syndrome, where severe swelling cuts off blood flow to the muscle.
Pain is another common symptom of muscle inflammation and can be treated with over-the-counter pain relievers, massage, and heat or cold therapy. Pain can also be an indicator of a more serious condition, such as a heart attack, and should be treated as an emergency if accompanied by chest pain or pressure, an abnormal heartbeat, or shortness of breath.
Weakness in the muscles can be caused by a lack of exercise or by more chronic conditions such as MS or myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS). Weakness may also be a symptom of myositis, where the inflammation causes a decrease in muscle function.
Stiffness in the muscles can be caused by sleeping in an awkward position, exercising too hard, or sitting at a computer all day. Stiffness can be relieved through stretching, exercising more frequently, and improving posture. Muscle stiffness is usually not a major cause for concern but can sometimes indicate a more serious infection or medical condition, especially if it occurs with other symptoms such as headaches, fever, or chest pain.
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Frequently asked questions
Myositis is a rare disease that causes chronic inflammation in muscles. It is caused by the immune system attacking muscles throughout the body. This inflammation can lead to muscle weakness, swelling, and pain.
The symptoms of myositis include muscle weakness, swelling, and pain. In some cases, myositis can also lead to a skin rash, lung disease, or heart problems. The main muscles affected are around the shoulders, hips, and thighs.
There is currently no cure for myositis, but treatments can help manage symptoms and put the disease into remission. Treatments include corticosteroids, immunosuppressants, and intravenous immunoglobulin. Physical therapy exercises can also help to keep the affected muscles flexible and strong.
Muscle inflammation can be caused by various factors, including intense exercise, injury, infection, autoimmune conditions, or drug side effects. In the case of myositis, it is caused by the immune system attacking healthy muscle fibers.











































