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Muscle weakness can be a symptom of many conditions, including myositis, a group of rare conditions that cause weak muscles. While the exact cause of myositis is unknown, it is believed to be triggered by infections, injuries, autoimmune conditions, or drug side effects. Infectious agents associated with myositis include viruses, bacteria, and protozoal infections. HIV-infected individuals, for instance, may develop inclusion body myositis, presenting with proximal muscle weakness. Viral infections, such as the common cold and influenza, can also trigger myositis. In rare cases, protozoal infections, such as sarcocystosis, caused by consuming undercooked meat or contaminated food, can lead to myositis and muscle weakness.
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Myositis
There is no cure for myositis, but there are treatments that can help control the symptoms. The best way to treat myositis depends on what is causing it. If it is due to an inflammatory condition, doctors may prescribe drugs that suppress the immune system. When myositis is caused by infection, it is most often due to a virus and does not normally need specific treatment. However, myositis caused by bacteria (which is uncommon) requires antibiotics to stop the infection from spreading.
There are several types of myositis, including polymyositis, dermatomyositis, and inclusion body myositis. Polymyositis causes muscle weakness, usually in the muscles closest to the trunk of the body. Dermatomyositis causes muscle weakness and a skin rash. Inclusion body myositis is a degenerative muscle disease that usually affects people older than 50. It causes muscle weakness in the extremities and can also affect the muscles in the throat, making it difficult to swallow.
The exact cause of myositis is unknown, but it is believed to be triggered by other health conditions, including infection, injury, autoimmune conditions, or drug side effects. Some people develop myositis after a viral infection, such as the common cold or influenza. Myositis is typically diagnosed through a physical examination and tests such as blood tests, MRI, EMG, and muscle biopsy.
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HIV infection
Human immunodeficiency virus (HIV) is associated with muscle weakness. HIV can affect peripheral sensory and motor nerves, thoracic nerves, cranial nerves, autonomic nerves, and the central nervous system. HIV neuropathy, a neurological disorder, can manifest in multiple ways, including numbness and pain in the hands and feet, and muscle weakness in the later stages of the illness. HIV can also cause a GBS-like illness with symptoms resembling Guillain-Barre syndrome, including rapidly progressive weakness, lactic acidosis, nausea, vomiting, weight loss, and abdominal distension.
Studies have shown that HIV negatively impacts muscle strength and function, particularly in the lower limbs. HIV-positive individuals often exhibit reduced muscle strength compared to HIV-negative individuals, and a positive relationship between lower limb muscle strength and lower extremity function has been observed. Proximal weakness in chronic HIV disease has also been reported, which may increase the risk of frailty, falls, and fractures. HIV medications, such as antiretroviral therapy (ART) and highly active antiretroviral therapy (HAART), can also contribute to muscle weakness by negatively influencing oxygen kinetics and limiting oxygen extraction and utilisation in the lower extremity musculature.
In addition to the direct effects of HIV on muscle weakness, untreated HIV can damage the peripheral nerves, leading to neurological complications. This nerve damage may result in chronic pain, including muscle pain, and can be caused by the virus itself or as a side effect of HIV treatments. HIV-related rheumatic diseases, such as myositis, polymyositis, and fibromyalgia, can also cause muscle weakness and pain.
The treatment of HIV-related muscle weakness and pain aims to address the underlying cause. HIV neuropathy may require good control of HIV infection, while antiretroviral toxic neuropathy may necessitate discontinuing the contributing drug. Nerve pain can be managed with anti-seizure medications, antidepressants, or analgesics. Chronic pain associated with HIV can be treated with a combination of medications, including pain relievers, anti-inflammatory drugs, and complementary therapies.
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Autoimmune conditions
Autoimmune diseases occur when the body's immune system attacks itself, causing the body harm instead of protecting it. There are more than 100 types of autoimmune diseases, and they can affect the body from head to toe. Autoimmune diseases can cause muscle weakness, joint pain, swelling, stiffness, and inflammation. Some examples of autoimmune diseases that cause muscle weakness include myositis and polymyositis.
Myositis is a rare autoimmune disease that causes chronic inflammation and swelling of the muscles, resulting in muscle weakness. It can affect muscles all over the body, making even simple movements difficult. Myositis can also cause trouble breathing, swallowing, and arrhythmia. Experts are unsure of the exact cause of myositis, but it is often associated with other autoimmune conditions such as lupus and rheumatoid arthritis.
Polymyositis is a type of myositis that specifically affects the muscles and causes muscle weakness, pain, and trouble swallowing. It is a rare disease that causes inflammation and irritation in the muscles, leading to muscle breakdown and weakness. Polymyositis can affect muscles all over the body and is most common in people aged 31 to 60. Similar to myositis, there is no known cure for polymyositis, but its symptoms can be managed through treatments and physical therapy.
While the exact causes of autoimmune diseases are unknown, certain factors may increase the risk of developing them. These factors include viral infections, genetic predispositions, exposure to certain chemicals or medications, and having biological relatives with autoimmune diseases.
If you experience muscle weakness, pain, or other symptoms of autoimmune diseases, it is important to consult a healthcare provider for proper diagnosis and treatment.
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Viral infections
Myositis is a group of rare conditions that cause muscle weakness and pain. It is characterised by muscle inflammation, which can make it harder to do everyday activities, such as climbing stairs or reaching over your head. While experts are unsure of the exact causes of myositis, it is believed that it could be triggered by viral infections.
During the COVID-19 pandemic, there was evidence that some infected patients developed multifactorial myalgia and weakness, suggesting an inflammatory myopathy similar to HIV-associated cases. Adenovirus has also been associated with myositis, as have dengue infections, which can cause multiorgan impairment and bleeding. Dengue-induced myositis is less aggressive in the paediatric population compared to adults.
Myositis can also be caused by certain viruses that do not seem to cause persistent muscle infection but may cause muscle inflammation through immune cell activation or molecular mimicry. These include HIV, HTLV-1, and hepatitis C. In two cases of inflammatory myopathy associated with chronic hepatitis B infection, viral DNA and antigens were found inside intact muscle fibres.
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Bacterial infections
Myositis can be caused by a wide variety of pathogens, including bacteria, fungi, parasites, and viruses. Bacterial myositis presents as a focal muscle infection, while viruses and parasites are more diffuse, leading to generalized myalgia or multifocal myositis. Skeletal muscle is resistant to bacterial infection, but invasion can occur due to injury, surgery, or ischemia. Immunocompromised individuals are at a higher risk of developing bacterial infections.
Pyomyositis is a rare bacterial infection of the skeletal muscle that results in pain, tenderness, and localized abscess formation. It is most commonly caused by the bacterium Staphylococcus aureus, a staph infection. Pyomyositis usually affects the muscles of the limbs and torso, particularly the thigh or pelvic muscles. Symptoms include pain, swelling, and fever. If left untreated, the infection can spread throughout the body, leading to severe complications, including organ failure.
In addition to pyomyositis, other bacterial infections that can cause muscle weakness include septic arthritis, cellulitis, and abscesses. Septic arthritis is a painful infection of the joint that can be caused by bacteria spreading through the bloodstream or a penetrating injury that delivers germs directly into the joint. Cellulitis is a common bacterial infection of the skin and the soft tissues underneath. Abscesses are collections of pus in confined tissue spaces, usually caused by bacterial infections or when germs enter the body through an open wound.
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Frequently asked questions
Yes, infection can cause muscle weakness. Myositis is a group of rare conditions that cause muscle weakness and inflammation. It can be triggered by infection, injury, autoimmune conditions, or drug side effects. Infectious or post-infectious reactive myositis can occur during and after some viral infections.
The symptoms of myositis vary between different people. The main symptom is muscle weakness, which can cause people to trip or fall over a lot. It can also cause muscle pain, swelling, stiffness, fever, fatigue, and skin rashes.
There is no cure for myositis, but there are ways to manage the symptoms. Doctors may prescribe drugs that suppress the immune system or recommend exercises like stretching and physical movements to strengthen the muscles.
