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Muscle inflammation, or myositis, is a rare disease that occurs when the immune system attacks muscles throughout the body. This can be caused by autoimmune diseases, viral infections, or intense exercise, leading to muscle pain, weakness, and swelling. Myositis can affect breathing, swallowing, and the heart in severe cases. While there is no cure, treatments such as medications, physical therapy, and procedures can help manage symptoms. Understanding the causes and seeking appropriate care is crucial for effective management of muscle inflammation.
| Characteristics | Values |
|---|---|
| Type | Acute or Chronic |
| Cause | Illness, injury, autoimmune disease, intense exercise, infection, allergic reaction, etc. |
| Treatment | Corticosteroids, NSAIDs, anti-inflammatory diet, physical therapy, etc. |
| Diagnosis | Physical exam, blood tests, MRI, EMG, muscle biopsy, etc. |
| Symptoms | Muscle pain, swelling, stiffness, weakness, etc. |
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What You'll Learn
Myositis, an autoimmune disease
Muscle inflammation occurs as a result of the body's response to an illness, injury, or something foreign in the body, such as germs or toxic chemicals. This process, known as inflammation, is crucial for healing. However, inflammation can become harmful if it persists for an extended period or affects healthy tissues.
Myositis is a rare autoimmune disease characterised by chronic muscle inflammation. It occurs when the immune system mistakenly attacks the body's muscles, leading to episodes of swelling and muscle weakness that can come and go over a lifetime. The specific causes of myositis are unknown, but it often co-occurs with other autoimmune conditions like rheumatoid arthritis, lupus, or scleroderma.
The early signs of myositis can be subtle and easily dismissed. For example, a trip or fall may be attributed to clumsiness, while difficulty climbing stairs or lifting objects may be blamed on a lack of exercise or ageing. Other initial symptoms include coughing, difficulty breathing, swallowing problems, and rashes.
Myositis affects different muscle groups throughout the body, including the arms, legs, neck, shoulders, hips, back, and abdomen. The inflammation caused by myositis can lead to muscle pain and weakness, making it hard or impossible to use the affected muscles. In some cases, the heart muscle or lung tissue may also become inflamed, resulting in serious health consequences such as heart arrhythmias and interstitial lung disease.
There is currently no cure for myositis. Treatment focuses on managing symptoms and includes physical therapy, speech therapy, dietary changes, and emotional support through counselling or support groups. Early diagnosis and treatment can help minimise complications and slow down the progression of the disease.
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Viral infections
Myositis is a disease that causes chronic inflammation of the muscles. It is often caused by viral infections, which can directly attack muscle tissue or release substances that damage muscle fibres. Viruses that can cause myositis include the common cold, influenza (H1N1), HIV, adenoviruses, and respiratory syncytial viruses. Myositis can also be caused by bacteria, fungi, or other organisms, but this is less common.
Viral myositis is characterised by muscle weakness, pain, and elevated muscle enzyme levels. It can occur in both children and adults, although it is more common in children, possibly due to the virus's tropism for immature muscle cells. In adults, it typically affects the calf muscles, while in children, it can affect multiple muscles simultaneously. The symptoms of viral myositis can vary depending on the strain of the virus and typically resolve within one week.
Myositis is diagnosed through a physical examination and tests such as blood tests, MRI, EMG, and muscle biopsy. However, muscle biopsy may not always detect the presence of a virus, and clinical evaluation and ancillary tests are also necessary for a definitive diagnosis. Treatment for myositis focuses on managing symptoms through medications, immunosuppressants, intravenous immunoglobulin, and physical therapy.
The risk of developing myositis after a viral infection can be lowered by taking precautions such as maintaining good hygiene, practising social distancing when possible, and getting vaccinated when recommended by healthcare providers. These measures can help reduce the chances of contracting viral infections that may trigger myositis.
While there is no cure for myositis, it can go into remission, with symptoms disappearing entirely. It is important for individuals with myositis to regularly take their medications, attend follow-up appointments, and work with their healthcare providers to manage their symptoms effectively.
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Bacterial infections
Bacterial myositis is an inflammation of muscle tissues as a result of a bacterial infection. It is usually localised and occurs after an injury. Staphylococcus and Streptococcus organisms are usually responsible for bacterial myositis. General indications of infection, such as fever and increased white blood cell count, are accompanied by local signs of inflammation, including reddening, swelling, and warmth. Abscess formation is rare, except for persons in tropical regions. Bacterial myositis is generally treated with antibiotics and, in some cases, minor surgery.
Myositis is often caused by viral infections, which are the most common infectious cause. Bacterial infections are an uncommon cause of myositis, but they can be more serious and require treatment with antibiotics to stop the infection from spreading. Mycobacterium spp. may cause myositis by direct extension from a contiguous source, such as an infected joint, or less commonly via bacteremia. The most common site of infection is a tuberculous psoas abscess, which forms by extension from vertebral osteomyelitis. Other examples include intercostal muscles affected by extension from the pulmonary tract and leg striated muscles due to extension from the knee.
Infectious myositis is uncommon due to the relative resistance of muscles to infection. However, physical injuries weaken defence mechanisms, leading to infection. The onset of bacterial myositis may be accompanied by headaches, fever, chills, sweating, and local pain and swelling in the tissue. In some cases, pustulant abscesses may develop. Muscle enzymes such as creatine kinase and aldolase may be normal despite muscle inflammation. Determining the causative organism is essential to optimising therapy, and a range of tests and cultures can be used to identify the specific bacterial agent.
Treatment for myositis caused by inflammatory conditions may include drugs that suppress the immune system, such as corticosteroids. Corticosteroids can be injected to decrease inflammation at a specific joint or muscle, or they may be prescribed as medications taken orally. An anti-inflammatory diet that includes fatty fish, fresh fruits, leafy greens, and spices like turmeric, ginger, or garlic may also help reduce and prevent inflammation.
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Intense exercise
DOMS can occur whenever a person increases their workout intensity, performs eccentric exercises, or tries a new form of exercise. Eccentric exercises involve tensing a muscle while lengthening it, such as the controlled, downward motion when straightening the forearm after a biceps curl. Eccentric exercises cause greater ultrastructural alterations in muscle tissue than concentric exercises, leading to increased muscle damage and inflammation.
The severity of DOMS is not related to the extent of exercise-induced muscle damage, and it is possible to lessen its intensity. For example, an older study found that males who drank water before, during, and after exercising in hot, humid temperatures experienced less muscle soreness than those who did not hydrate. Implementing recovery strategies, such as heat and cold therapy, can also help to prevent and manage DOMS.
Inflammatory responses to intense exercise are characterised by the mobilisation of leukocytes and an increase in circulating inflammatory mediators produced by immune cells and active muscle tissue. Pro-inflammatory cytokines TNF-α, IL-1β, and IL-6 are released after intense exercise, followed by the release of anti-inflammatory cytokines IL-4, IL-10, IL-1RA, and IL-13, which attenuate the inflammatory response.
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Trauma and injury
When a muscle is injured, significant inflammation and swelling occur. This inflammatory phase is followed by the muscle's healing process, which involves regenerating muscle fibres. However, scar tissue also forms where the injury occurred, and the muscle tissue may never fully regenerate, making the muscle more susceptible to future injuries.
The inflammatory response to trauma or injury involves the activation of nearly all components of the immune system, including the neuroendocrine system. Local tissue destruction and the accumulation of toxic byproducts of metabolic respiration lead to the release of mediators, which can spill over into the peripheral bloodstream, amplifying the systemic inflammatory response. Hormones like ACTH, corticosteroids, and catecholamines, as well as cytokines, chemokines, and alarmins, play crucial roles in initiating and maintaining the pro-inflammatory response after severe injury.
The inflammatory response after trauma or injury can be divided into two phases: the pro-inflammatory response and the anti-inflammatory response. The initial pro-inflammatory response, also known as the systemic inflammatory response syndrome (SIRS), can lead to tissue destruction in organs not originally affected by the trauma, resulting in multi-organ dysfunction (MOD). The pro-inflammatory response is followed by an anti-inflammatory response, which can result in immune suppression, increasing the risk of infection and sepsis.
While inflammation has historically been viewed as detrimental to recovery, the notion that it is essential for muscular repair and regeneration is gaining acceptance. Inflammatory cells promote both injury and repair through the actions of free radicals, growth factors, and chemokines. Muscle-derived nitric oxide, for example, can protect the muscle from lysis by inflammatory cells, while muscle-derived cytokines can signal for inflammatory cell invasion.
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Frequently asked questions
Muscle inflammation can occur due to various reasons, including injury, intense exercise, viral or bacterial infections, autoimmune diseases, and in rare cases, due to medications such as statins. The medical term for muscle inflammation is myositis, which is caused by the immune system attacking muscles, leading to chronic inflammation and muscle weakness.
Symptoms of muscle inflammation include muscle pain, swelling, and weakness. In some cases, muscle inflammation can also cause joint pain, lung inflammation, and skin rashes.
Treatment for muscle inflammation depends on the underlying cause. Rest and recovery are often recommended for mild cases of muscle inflammation caused by exercise or strain. For more severe cases, such as myositis, medications that suppress the immune system may be prescribed.
There are several types of muscle inflammation, including acute and chronic inflammation. Acute inflammation is sudden and temporary, while chronic inflammation can last for months or years. Different types of myositis include inclusion body myositis, polymyositis, and dermatomyositis, each with distinct characteristics and treatment responses.
Yes, an anti-inflammatory diet that includes fatty fish like salmon, fresh fruits, leafy greens, and spices like turmeric, ginger, or garlic can help reduce and prevent muscle inflammation.
