
Muscle pain, or myalgia, can be caused by several factors, including injuries, infections, or other health issues. It can be temporary or chronic, and its intensity varies from person to person. While most cases of muscle pain can be treated at home, it can also indicate a more serious underlying condition, especially when it is widespread and persistent. Certain medications, such as statins and ACE inhibitors, can also cause muscle pain as a side effect. Intense physical activity, heavy weight lifting, or new exercise routines can lead to delayed-onset muscle soreness (DOMS), which typically occurs 6 to 12 hours after exercise and can last up to 48 hours. Stress is another common factor that can cause muscles to become tense during stressful events or lead to constant tension and pain in cases of long-term stress. If muscle pain is persistent, severe, or accompanied by other symptoms, it is important to seek medical attention to rule out any underlying conditions and receive appropriate treatment.
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What You'll Learn

Muscle overuse, tension or injury from exercise
Muscle pain, or myalgia, is often temporary and not serious, but it can sometimes be a symptom of a long-term condition. It is usually caused by muscle overuse, tension, or injury from exercise.
Muscle overuse can lead to small tears in the muscle fibres, causing pain and soreness. This can occur when a person does not give their muscles enough time to recover between workouts or when they engage in repetitive movements without proper rest. Overtraining without adequate recovery weakens the muscles, making them more susceptible to tears. Undertraining can also be an issue, as muscles with low flexibility and strength can strain more easily during ordinary use.
Exercise-related muscle pain can manifest as acute soreness, felt immediately after physical activity, or as delayed-onset muscle soreness, which can set in a day or two later. Delayed soreness typically occurs 6 to 12 hours after exercise and may persist for up to 48 hours. During this time, an individual may experience pain as their muscles recover.
To alleviate muscle pain caused by overuse, tension, or minor injuries, several treatments can be employed:
- Rest: Giving sore muscles time to rest allows them to heal and build back stronger.
- Gentle stretching: Careful stretching can prevent stiffness and aid in recovery.
- Massage: Massage therapy can relieve tension and improve blood flow to sore muscles, aiding in recovery.
- Heat therapy: Applying heat through a heat wrap or warm bath can relax muscles and encourage blood flow, helping with general tension and stiffness.
- Cold therapy: For recent injuries or acute pain, cold therapy reduces inflammation and swelling. Applying an ice pack or soaking in a cold bath can help.
- Over-the-counter medications: Pain relievers such as NSAIDs (non-steroidal anti-inflammatory drugs) like ibuprofen can reduce inflammation and manage pain.
While most muscle pain from exercise can be treated at home, it is important to seek medical attention if the pain persists, intensifies, or is accompanied by other symptoms such as fever, chest pain, muscle weakness, numbness, or loss of bladder control.
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Underlying medical conditions, e.g. fibromyalgia
While muscle pain, or myalgia, is usually temporary and not serious, it can sometimes be a symptom of an underlying medical condition. One such condition is fibromyalgia, a chronic condition characterised by widespread pain in muscles and soft tissues all over the body. The pain associated with fibromyalgia is often described as a constant dull ache that has lasted for at least three months, occurring on both sides of the body and both above and below the waist. This pain may be worse in the morning and evening, and can be accompanied by stiffness, soreness, burning, or a gnawing sensation.
Fibromyalgia is also associated with fatigue, which can range from mild tiredness to flu-like exhaustion. This fatigue does not improve with sleep or rest and can be accompanied by sleep problems, including restless legs syndrome and sleep apnea. The condition is also linked to issues with memory and mood, with many patients experiencing depression and anxiety. Other symptoms include irritable bowel syndrome, headaches, and interstitial cystitis (painful bladder syndrome).
The causes of fibromyalgia are not fully understood, but researchers believe that it may be linked to sleep problems, stress, and immune, endocrine, or biochemical problems. Some researchers think that fibromyalgia affects the way the brain and spinal cord process painful and non-painful signals, increasing overall sensitivity to pain. This theory is supported by the fact that people with fibromyalgia often report that the slightest touch can cause pain. Fibromyalgia also tends to run in families, so certain gene changes may increase the likelihood of developing the condition.
While there is no cure for fibromyalgia, symptoms can be managed through a combination of treatments. These may include anti-inflammatory medications, other pain medicines, and medicines to treat depression (antidepressants). Exercise, particularly aerobic and strengthening exercises, can also help to improve symptoms, as can relaxation methods, cognitive behavioural therapy, and heat or cold treatments. Alternative treatments such as acupuncture, chiropractic therapy, and massage therapy may also be beneficial.
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Stress
Additionally, stress can cause jaw clenching or teeth grinding, resulting in uncomfortable tightness or soreness in the jaw and contributing to TMJ, a jaw disorder. It can also trigger tension headaches, tightness in the neck and jaw, and knots and spasms in the neck and shoulders.
To manage stress-related muscle pain, it is essential to find healthy ways to cope with stress. This may include practicing self-care, engaging in creative activities, or trying relaxation techniques such as deep breathing, meditation, or gentle stretching to help release muscle tension. Seeking professional help or talking to your doctor can also be beneficial in managing stress and its physical symptoms.
If you are experiencing sudden and persistent muscle pain, it is always advisable to consult a healthcare professional to rule out any other underlying causes or conditions that may require medical attention.
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Side effects from medication
Medication side effects are a common cause of sudden persistent muscle pain. Drug-induced myopathies are a recognised group of disorders that affect the skeletal muscle structure, metabolism, or channel function, and they usually present with muscle pain or weakness. The range of drug-related muscle symptoms is wide, including myalgia, cramps, muscle weakness, exercise intolerance, or even rhabdomyolysis and myositis.
Statins, a cholesterol-lowering medication, are known to cause muscle pain in a small percentage of individuals. Simvastatin (Zocor) is one of the statins most likely to cause muscle-related side effects. Fibrates, such as gemfibrozil (Lopid), are another cholesterol-lowering medication that can cause muscle pain. Lowering the dosage or switching to a different statin can help reduce the pain.
Oral corticosteroids, commonly known as steroids, can also cause muscle pain and weakness. Prednisone and dexamethasone are long-term use steroids that can lead to "steroid-induced myopathy," which affects pelvic muscles and causes muscle weakness without pain. Older people and women are more likely to develop this condition.
Other medications that can cause muscle pain include bisphosphonates, which are used to treat osteoporosis, and some blood pressure medications, such as beta-blockers. Additionally, pregabalin, an anticonvulsant drug used to treat epileptic seizures and nerve pain, has been known to cause muscle and joint pain in some patients.
It is important to note that not all medications will cause muscle pain in everyone, and the benefits of the medication often outweigh the potential side effects. However, if you experience muscle pain or weakness while taking any medication, it is essential to consult your doctor or healthcare provider to discuss your options. They may recommend adjusting the dosage, switching to a different medication, or trying alternative therapies to manage your condition effectively without causing muscle pain.
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Cancerous tumours
In the case of lung cancer, muscle weakness and pain can occur when tumours spread to the bones, affecting other areas of the body. This can result in sudden weakness in the legs and breathing difficulties due to the location of the cancerous tumours near the lungs. The lack of oxygen supply to the muscles caused by breathing difficulties can lead to muscle fatigue and weakness. Additionally, lung cancer patients may experience muscle inflammation, medically known as myositis, as their immune system constantly fights cancerous tumours.
Cancer treatments such as chemotherapy and radiotherapy can also cause muscle pain and weakness. Chemotherapy drugs can directly affect muscle cells, leading to muscle inflammation and pain. Furthermore, cancer patients may experience muscle loss and fatigue due to stress, inactivity, and unhealthy eating habits. However, it is important to note that diet and exercise alone are usually not sufficient to prevent muscle weakness in cancer patients.
If you are experiencing sudden persistent muscle pain, it is important to seek medical attention, especially if the pain is not improving with rest and home care. Doctors may recommend additional tests, such as blood tests, to determine the underlying cause and provide appropriate treatment.
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Frequently asked questions
Muscle pain, or myalgia, is usually caused by tension, overuse, or injury from exercise or physically demanding work. It can also be caused by infections, such as colds, influenza, or malaria. In some cases, it may be caused by certain medications or chronic diseases.
Muscle pain from temporary causes like exercise or strain will usually improve with rest and home care. However, if soreness persists for more than a few days or worsens despite rest, it could indicate a more serious issue. Seek medical attention if you experience fever, chest pain, muscle weakness, numbness, loss of bladder control, or worsening pain.
For muscle pain due to overuse or injury, it is recommended to rest the affected area and take over-the-counter medications such as acetaminophen or ibuprofen. Stretching before and after exercising, warming up, and cooling down can also help prevent muscle pain. If home measures are ineffective, a healthcare provider may prescribe medicine or physical therapy.











































