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The flu is a viral infection that affects the respiratory tract, including the nose, throat, and lungs. It causes a range of symptoms, including fever, chills, cough, congestion, and body aches. One of the most prominent symptoms of the flu is muscle weakness, which can be frustrating and alarming for patients. This muscle weakness is caused by the body's immune response to the virus, specifically the creation of proteins and the release of white blood cells to fight off the infection. The flu can also lead to inflammation, which contributes to muscle aches and pain. In addition, research has shown that influenza infection leads to an increase in muscle-degrading genes and a decrease in muscle-building genes in skeletal muscles, particularly in the legs, hindering walking and leg strength.
| Characteristics | Values |
|---|---|
| Flu symptom | Muscle weakness |
| What causes it | The immune response to the virus |
| Other names | Myositis |
| Prevalence | Common |
| Treatment | Ibuprofen, rest, sleep |
| Prevention | Flu vaccine |
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What You'll Learn
Muscle inflammation
Myositis can affect the whole body and not just the muscles. The most common muscles to be affected are those around the shoulders, hips, and thighs. The weakening and tiredness in the muscles can make people with myositis more prone to falling over. Moreover, myositis can also affect breathing and swallowing, and in rare cases, it may cause weakening of the heart. If there is inflammation in the lungs, it can cause scarring, which can affect lung function.
There are two specific types of myositis: polymyositis and dermatomyositis. Polymyositis causes muscle weakness, usually in the muscles closest to the trunk of the body. Dermatomyositis causes muscle weakness and a skin rash. Children with dermatomyositis may develop painful deposits of the mineral calcium in damaged muscles, which can occasionally result in permanently rigid joints, called contractures.
Acute viral myositis is a rare condition that occurs during the recovery phase of an illness, most commonly influenza. It is characterised by muscle pain and weakness, with elevated serum creatine kinase (CK). During the 2009 influenza A (H1N1) virus pandemic, three previously healthy patients were hospitalized after developing myositis. They all experienced muscle pain and weakness in all four extremities, which resolved within one week with supportive care.
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Myalgia
The immune system fights the influenza infection by sending antibodies to attack the virus and block its spread. This immune response can lead to muscle inflammation and weakness, called myositis, or joint and muscle pain, called myalgia. In young individuals, these effects are transient and return to normal once the infection is cleared.
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Myositis
Muscle weakness and pain are common symptoms of the flu. Orthopaedic surgeon Thomas Donaldson explains that when the body is infected with a virus, the immune system works to fight the infection, and this battle can lead to muscle inflammation and weakness, or myositis. Acute viral myositis is a rare condition that occurs during the recovery phase of an illness, most commonly influenza.
Polymyositis causes muscle weakness, usually in the muscles closest to the trunk of the body. Dermatomyositis causes muscle weakness and a skin rash. While it is still unclear what causes myositis, some scientists believe certain individuals have a genetic predisposition to develop an autoimmune disease, which is triggered by an environmental exposure to some trigger, such as infection, virus, toxin, or sunlight. Inflammatory myopathies are autoimmune diseases, meaning the body’s immune system, which normally fights infections and viruses, is misdirected and begins to attack the body’s own normal, healthy tissue.
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Muscle soreness
In addition to muscle soreness, the flu can cause joint pain, fever, chills, congestion, headaches, and a productive or dry cough. Some people may also experience vomiting and diarrhea, although this is more common in children than adults. These symptoms can be frustrating and alarming, especially for those who already have joint or bone issues.
The good news is that there are ways to alleviate muscle soreness and other flu symptoms. Staying hydrated, taking warm showers, and using over-the-counter anti-inflammatory medications such as ibuprofen or naproxen can help ease the pain. Getting plenty of rest and sleep is crucial, as it allows the body to focus its energy on the immune response, fighting off the virus, and recovering.
In rare cases, the flu can lead to acute viral myositis, a condition characterized by muscle pain, weakness, and elevated serum creatine kinase (CK) levels. This typically occurs during the recovery phase of the illness and usually resolves within a week with supportive care. However, it's important to note that influenza-related myositis may present atypically depending on the strain of influenza.
While muscle soreness is a common symptom of the flu, it is important to be vigilant and seek medical advice if necessary, especially for those who are pregnant or have underlying medical conditions.
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Immune response
The flu is a contagious respiratory illness caused by influenza viruses that infect the nose, throat, and lungs. While the influenza virus is usually contained in the lungs, several symptoms of influenza are systemic, including fever, headache, fatigue, and muscle aches.
The immune system's response to the virus is what causes the muscle weakness and aches associated with the flu. This response involves the body's innate immune system, including cells such as macrophages and neutrophils. These cells express receptors that detect the presence of the virus. They then trigger the production of cytokines and chemokines, small hormone-like molecules that activate other components of the immune system and direct them to the site of infection.
One of the critical cytokines activated during influenza infection is Interleukin-1, which helps develop a killer T cell response against the virus. However, Interleukin-1 also affects the part of the brain in the hypothalamus that regulates body temperature, resulting in fever and headaches. Another essential cytokine in fighting influenza is tumor necrosis factor alpha, which has direct antiviral properties.
The body also produces antibodies to seek out and attack the virus, preventing its spread. Once the antibodies have bonded with the virus, the body produces a type of protein to kill it. This protein is what causes the symptoms of inflammation in the muscles and joints, leading to pain and weakness. White blood cells also produce cytokines, which contribute to inflammation and pain.
In addition to causing muscle pain and weakness, the immune response to influenza can lead to other complications. For example, the flu can trigger an extreme inflammatory response in the body, which can result in sepsis, a life-threatening condition. The flu can also cause secondary infections, such as sinus or ear infections, and pneumonia, a severe lung infection. In rare cases, the flu can lead to inflammation of the heart (myocarditis), brain (encephalitis), or muscle tissues (myositis, rhabdomyolysis), and multi-organ failure.
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Frequently asked questions
Yes, muscle weakness is a common symptom of the flu. This is due to the body's immune response to the virus, which can cause inflammation and an increase in muscle-degrading genes.
Other symptoms of the flu include fever, chills, congestion, a runny nose, headaches, fatigue, a sore throat, and a cough. Less common symptoms include vomiting and diarrhea, which are more likely to occur in children than adults.
It is important to get plenty of rest and sleep to allow your body to focus its energy on the immune response. Staying hydrated, taking warm showers, and using over-the-counter anti-inflammatory drugs such as ibuprofen or naproxen can also help alleviate muscle weakness and pain.
