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Muscle pain can be caused by a variety of factors, including strain injuries, viral infections, bacterial infections, and intense exercise. In some cases, muscle pain can also be a symptom of an underlying condition such as myositis, an inflammatory myopathy that causes muscle inflammation and pain. Myositis can be challenging to diagnose, and its exact cause is not always known, but it is believed to be triggered by infection, injury, autoimmune conditions, or drug side effects. Polymyositis, dermatomyositis, and inclusion body myositis are all types of myositis that can cause muscle inflammation and pain. While there is no cure for myositis, symptoms can be managed through treatments such as steroids, anti-inflammatory medications, and rest.
| Characteristics | Values |
|---|---|
| Muscle pain type | Localized muscle pain or soreness in one spot, diffuse all-over body aches |
| Causes | Muscle stress from overuse, traumatic injuries, viral and bacterial infections, drug toxicities, inflammatory and autoimmune diseases, chronic pain syndromes, neuromuscular disorders, metabolic disorders and imbalances |
| Treatment | Over-the-counter pain relievers, NSAIDs (nonsteroidal anti-inflammatory drugs), topical treatments, steroids, anti-inflammatory medicines, gentle stretching, massage, cold therapy |
| Diagnosis | Patient history, physical exam, diagnostic tests (blood tests, imaging exams, electromyography, nerve conduction studies, muscle and/or skin biopsies) |
| Conditions | Myositis, myalgia, polymyositis, dermatomyositis, inclusion body myositis, necrotizing autoimmune myopathy |
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What You'll Learn
Myositis: Muscle inflammation and its causes
Myositis is a condition characterised by muscle inflammation, which can cause muscle weakness, pain, and swelling. It can be challenging to diagnose due to its similarity to other conditions, and there is currently no cure. However, treatments are available to manage the symptoms. Myositis can affect people of all ages and may be triggered by various factors, including infection, injury, autoimmune conditions, or drug side effects.
Causes of Myositis
Myositis can have various causes, and experts are still working to understand them all fully. Some known causes include:
- Viral infections: Myositis can occur during or after viral infections, even once the virus has cleared. This is known as infectious or post-infectious reactive myositis.
- Drug side effects: Certain medications, particularly statins used to lower cholesterol, can cause temporary muscle damage and myositis-like symptoms.
- Autoimmune conditions: Myositis is often associated with autoimmune conditions, where the body's immune system attacks its own cells, causing inflammation and damage.
- Injury and overuse: Intense exercise, repetitive strain, and traumatic injuries can lead to muscle inflammation and myositis.
Symptoms of Myositis
The symptoms of myositis can vary between individuals but often include:
- Muscle weakness, particularly in proximal muscle groups such as the deltoids and quadriceps.
- Muscle pain and swelling, which can make everyday activities difficult.
- Inflammatory arthritis: pain, swelling, and stiffness in the joints, especially after prolonged inactivity.
- Interstitial lung disease: an inflammatory lung condition causing a cough and/or shortness of breath.
- Skin rashes, particularly on the scalp, around the eyes, chest, and hands, which may be itchy and have a dark red or purple hue.
Diagnosis and Treatment
Diagnosing myositis can be challenging due to its similarity to other conditions. A comprehensive assessment is necessary, including a patient's history, a physical exam, and diagnostic tests such as blood tests, imaging exams (MRI, ultrasound), and muscle biopsies. Treatment options include:
- Steroids: Given as tablets or injections, steroids can quickly reduce inflammation and settle muscle pain. However, long-term use may increase the risk of osteoporosis.
- Anti-inflammatory medicines: These medicines, including steroid medications, can help ease inflammation and manage symptoms.
- Rest and recovery: In many cases, allowing the muscles to rest and recover can help alleviate inflammation and pain.
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Viral infections and muscle inflammation
Muscle pain can be caused by a variety of factors, including muscle stress, injury, and infections. Viral infections, in particular, can trigger inflammation throughout the body, including in the muscles. This condition, known as myositis, involves muscle inflammation that leads to weakness, pain, and swelling. Myositis can be challenging to diagnose, but a comprehensive assessment involving a patient's history, physical examination, and diagnostic tests can help.
Viral infections are a common cause of myositis. While the exact mechanism is not fully understood, viruses are believed to directly attack muscle tissue or release substances that damage muscle fibers. Common viruses associated with myositis include the cold, flu, and, in rare cases, HIV. The immune system's response to viral infections can also contribute to inflammation in the body, including muscle inflammation. This post-infectious reactive myositis can occur even after the virus has been eliminated and may last for several months.
In addition to viral infections, myositis can be caused by drug toxicities, autoimmune conditions, and, in rare cases, bacterial or fungal infections. The condition typically causes muscle weakness, especially in proximal muscle groups like the deltoids and quadriceps. Other symptoms may include inflammatory arthritis, interstitial lung disease, rashes, and nail bed inflammation. Diagnosis of myositis involves blood tests, imaging exams (MRI and ultrasound), electromyography, nerve conduction studies, and muscle or skin biopsies.
Treatment for myositis aims to manage symptoms and may include medications such as steroids to reduce inflammation and pain. Physical therapy, gentle stretching, and massage can also help ease pain and improve muscle flexibility and strength. While there is no cure for myositis, early diagnosis and proper management can lead to remission, where symptoms disappear entirely. It is important to work closely with healthcare professionals and seek their advice when experiencing muscle pain or other symptoms associated with myositis.
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Drug-induced myopathies
Muscle pain or myalgia is a frequent symptom experienced by most people at certain points in their lives. Drug-induced myopathies are a common cause of muscle pain. Myopathies are a group of disorders that primarily affect the skeletal muscle structure, metabolism, or channel function. They usually present with muscle pain or muscle weakness that interferes with daily life activities.
The range of drug-related muscle symptoms is wide, including myalgia, cramps, muscle weakness, exercise intolerance, or even rhabdomyolysis and myositis. The range of drugs that can cause muscle side effects is constantly expanding. Some of the drugs frequently associated with adverse muscular effects include hypolipemic drugs, beta-blockers, amiodarone, colchicine, glucocorticosteroids, antimalarials, cyclosporine, zidovudine, and checkpoint inhibitors.
Statins, which are used to lower cholesterol levels, are one of the most common drugs to cause myositis, a type of muscle inflammation. Usually, stopping this drug treatment leads to an improvement in symptoms. Occasionally, symptoms can last after drug treatment has been stopped, and people can develop myositis.
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Muscle pain relief
Muscle pain, or myalgia, can have many causes, from muscle stress and strain to chronic conditions. The good news is that many types of muscle pain can be treated at home, and there are several ways to relieve muscle pain.
Rest
Rest is important for muscle recovery. When muscles are overused or strained, small tears can form in the muscle fibres, and rest gives them a chance to heal and build back stronger.
Stretching
Gentle stretching can help prevent stiffness while your muscles recover. If you have an injury, a physical therapist can advise you on when and how to stretch.
Massage
Massage can relieve tension and improve blood flow to sore muscles, aiding recovery.
Cold Therapy
Cold therapy can help with recent injuries or acute pain by reducing inflammation and swelling. Try an ice pack or cold bath.
Compression and Elevation
Compression bandages and elevation can help to reduce swelling.
OTC Medications
Over-the-counter pain relievers can help with minor aches and pains. Nonsteroidal anti-inflammatory drugs (NSAIDs) like aspirin and ibuprofen can also reduce inflammation.
Topical Treatments
Topical pain relievers can help with localised muscle pain. Ingredients like menthol, capsaicin, or lidocaine can numb the area and reduce soreness.
Steroids
For more severe inflammation, steroids can be prescribed as tablets or injections. They work quickly to reduce inflammation and settle muscle pain. However, they should be used with caution as they can have side effects, and long-term use can increase the risk of osteoporosis.
Address Stress
Stress can make it harder for the body to fight off disease and inflammation, so learning relaxation techniques and removing yourself from stressful situations can help to reduce muscle pain.
Hydration
Drinking enough water is vital as dehydration can cause muscle aches.
Nutrition
A lack of proper nutrition can cause muscle aches. For example, a vitamin D deficiency can lead to hypocalcaemia, where blood calcium levels are low, affecting bones, organs, and muscles.
If your muscle pain is severe, does not improve, or is accompanied by other symptoms, seek medical attention.
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Chronic inflammatory myopathies
Inflammatory myopathies are a group of rare diseases that involve chronic muscle inflammation, muscle weakness, and, in some cases, muscle pain. Myopathy is a general term used to describe conditions affecting the muscles. Myositis is the term used to describe muscle inflammation.
The four main types of chronic inflammatory myopathy are:
- Polymyositis: Affects skeletal muscles involved in body movement on both sides of the body.
- Dermatomyositis: Causes progressive muscle weakness and is distinguished by a reddish or purplish rash on the eyelids, elbows, knees, or knuckles.
- Inclusion body myositis: Characterized by slow, progressive muscle weakness and muscle shrinking, with the most affected muscles being those of the wrists, fingers, and the front of the thighs.
- Necrotizing autoimmune myopathy: Involves muscle weakness in the upper and lower body.
The majority of inflammatory myopathies are considered autoimmune disorders, where the body's immune system attacks its own tissues and organs. Idiopathic inflammatory myopathy is likely caused by a combination of genetic and environmental factors, although the specific cause is unknown. Researchers have identified variations in genes that may increase the risk of developing this condition. Exposure to certain environmental triggers, such as infection, medications, and ultraviolet light, may also play a role.
Diagnostic tests for inflammatory myopathies include blood tests, imaging exams (MRI and ultrasound), electromyography, nerve conduction studies, and muscle biopsies. Treatment options include medication, physical therapy, exercise, heat therapy, orthotics, assistive devices, and rest. While there is no cure for most adults with chronic inflammatory myopathies, many of the symptoms can be managed.
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Frequently asked questions
Muscle pain, or myalgia, is usually caused by strain injuries or ordinary illnesses such as colds and flu. Localized muscle pain in one spot is often related to an injury or recent stress on that muscle group.
Muscle inflammation, or myositis, can be caused by viral infections, autoimmune conditions, drug side effects, or injury. Polymyositis is a disease that causes muscles to become irritated and inflamed.
Symptoms of muscle inflammation include muscle weakness, pain, and swelling. In rare cases, myositis can affect breathing and swallowing, and may cause weakening of the heart.
Muscle inflammation can be treated with steroids, anti-inflammatory medicines, rest, gentle stretching, massage, and cold therapy. There is no cure for myositis, but symptoms can be managed and eased.
