Myalgia (Muscle Pain): Causes, Symptoms, Diagnosis, and Treatment

Muscle pain is something almost everyone experiences at some point. It may appear after an intense workout, a long day of physical activity, an injury, an infection or even prolonged stress. Sometimes it settles within a few days. At other times, persistent or widespread muscle pain can be a sign of an underlying health condition.

The medical term for muscle pain is myalgia. It can affect a single muscle, a group of muscles or muscles throughout the body. The pain may feel like an ache, tightness, tenderness, cramping, burning or, in some cases, a sharp pain.

Myalgia itself is a symptom rather than a disease. The reason behind the pain is therefore more important than the pain alone. Common causes include muscle overuse, injuries, infections, certain medicines, nutritional deficiencies, electrolyte disturbances and chronic conditions.

This guide explains the main causes of myalgia, different ways muscle pain can present, how it is diagnosed, treatment options and when you should seek medical advice.

What is myalgia?

Myalgia simply means muscle pain or muscle ache. The term can describe pain in one specific area or discomfort affecting several parts of the body.

For example, soreness in your thighs after an unfamiliar workout may be myalgia. Similarly, widespread body aches during influenza can also be described as myalgia.

Myalgia may be:

• Mild or severe
• Short-lived or persistent
• Localized or widespread
• Constant or intermittent
• Dull and aching or sharp and uncomfortable

Muscle pain can sometimes involve surrounding soft tissues such as tendons, ligaments and fascia as well.

What is another name for myalgia?

The simplest and most commonly used name for myalgia is muscle pain or muscle ache. You may also see terms such as muscular pain or body aches used depending on the situation.

It is important not to confuse myalgia with myositis. Myositis refers to inflammation of muscles, while myalgia describes the symptom of muscle pain and can have many different causes.

What is the main cause of myalgia?

There isn’t one single cause of myalgia. However, muscle overuse, tension, minor injury and physical strain are among the most common causes of localized muscle pain.

Examples include:

• Exercising harder than usual
• Lifting heavy objects
• Repetitive physical activity
• Poor posture
• Sitting in the same position for long periods
• Muscle strains and sprains
• Minor traumatic injuries
• Physical stress and tension

Widespread muscle pain, on the other hand, may have a different cause. Viral infections such as influenza can produce body-wide aches, while conditions such as fibromyalgia, autoimmune diseases and certain metabolic disorders can cause persistent or recurrent pain.

So, if you’re asking “What is the most common cause of myalgia?”, the answer depends on the pattern of pain. For localized muscle pain, overuse, tension and minor injury are particularly common. For widespread muscle aches, infections and systemic conditions become more important considerations.

What are the three types of myalgia?

There is no single universally accepted medical classification that divides all myalgia into exactly three types. Healthcare professionals commonly describe myalgia according to its location, duration and underlying cause. Cleveland Clinic, for example, distinguishes localized and diffuse myalgia.

For easy understanding, muscle pain can be described in three broad patterns:

1. Localized myalgia

Pain is restricted to one muscle or a particular area.

Examples include:

• Calf pain after strenuous exercise
• Shoulder muscle pain after lifting
• Back muscle strain
• Thigh pain following an injury

2. Diffuse or widespread myalgia

Pain affects several areas or much of the body. It can occur with infections or certain chronic health conditions.

Flu-related body aches are a familiar example.

3. Recurrent or chronic myalgia

Pain repeatedly returns or persists over a longer period. It may be associated with conditions such as fibromyalgia, chronic pain disorders, inflammatory muscle diseases or other underlying medical problems.

The pattern, duration and accompanying symptoms help a healthcare professional determine what may be causing the pain.

What are the main causes of myalgia?

Myalgia has a surprisingly long list of possible causes. Some are temporary and harmless, while others need medical investigation.

Muscle overuse and physical strain

Doing more physical activity than your muscles are accustomed to can cause soreness. This may happen after starting a new exercise routine, increasing workout intensity or performing repetitive movements.

Delayed-onset muscle soreness can appear several hours after exercise and may become more noticeable the following day.

Injuries

Muscle strains, bruises and other injuries can cause localized pain, tenderness and sometimes swelling.

A sudden movement, fall, sports injury or heavy lifting can overstretch or damage muscle fibres.

Infections

Viral and bacterial infections can cause myalgia. Influenza, for example, commonly produces generalized body aches. Other infections can also cause muscle pain as part of the body’s broader inflammatory response.

Stress and tension

Emotional stress can contribute to muscle tension, particularly around the neck, shoulders and back. Prolonged tension may produce aching and stiffness.

Fibromyalgia and chronic pain conditions

Fibromyalgia can cause widespread pain, tenderness, fatigue and sleep problems. In these situations, muscle pain may persist even when there is no obvious muscle injury.

Vitamin and mineral deficiencies

Certain nutritional deficiencies and electrolyte abnormalities can affect normal muscle function.

Vitamin D deficiency is particularly relevant because severe deficiency in adults can cause osteomalacia, which may result in bone pain and muscle weakness.

Low levels of minerals such as potassium, calcium and magnesium can also contribute to muscle cramps or pain.

Thyroid problems

Hypothyroidism can affect muscle function and may contribute to muscle aches, stiffness or weakness.

Certain medicines

Some medicines can cause muscle pain as a side effect. Statins, which are commonly prescribed to lower cholesterol, are a well-known example.

Reduced blood supply

In uncommon situations, reduced blood flow to a muscle can cause significant pain. This requires prompt medical assessment, particularly when symptoms are sudden or severe.

Neuromuscular disorders

Diseases affecting the nerves or muscles can sometimes cause pain along with weakness, spasms, cramps or changes in muscle function.

Autoimmune and inflammatory conditions

Conditions such as inflammatory myopathies, dermatomyositis and polymyositis can cause muscle symptoms, often accompanied by weakness.

Other systemic illnesses

Less commonly, persistent muscle pain can occur alongside metabolic disorders, certain cancers or other significant diseases. This is why unexplained, persistent or progressively worsening myalgia should not simply be ignored.

What drugs cause myalgia?

Several medicines can potentially cause muscle pain. Statins are among the best-known examples. These include medicines such as atorvastatin, rosuvastatin, simvastatin, pravastatin and other drugs in the statin group.

Other medicines have also been associated with muscle aches in certain circumstances, including some blood-pressure medicines, particularly ACE inhibitors, and some other drug classes.

Importantly, don’t stop a prescribed medicine on your own because you develop muscle pain. Speak with your doctor. They may review the medication, dosage, timing of symptoms and other possible causes.

For suspected statin-related muscle symptoms, a doctor may sometimes check creatine kinase (CK), an enzyme that can rise when muscles are inflamed or damaged.

What vitamin deficiency causes muscle pain?

Vitamin D deficiency is one of the important nutritional deficiencies associated with muscle symptoms. Significant vitamin D deficiency can cause muscle weakness and bone pain in adults.

However, muscle pain should not automatically be attributed to a vitamin deficiency. Other possibilities include:

• Vitamin D deficiency
• Electrolyte disturbances
• Thyroid disorders
• Certain medications
• Infections
• Muscle injury
• Inflammatory muscle disorders

Vitamin B12 deficiency can cause neurological symptoms such as numbness, tingling and weakness, although muscle pain itself is not the defining symptom of B12 deficiency.

If symptoms suggest a deficiency, blood testing can help identify the problem before starting supplements.

Can dehydration cause myalgia?

Yes, dehydration can contribute to muscle cramps, aches and discomfort, particularly when fluid loss is accompanied by an electrolyte imbalance.

This can happen after:

• Heavy sweating
• Intense exercise
• Vomiting or diarrhoea
• Fever
• Prolonged exposure to heat
• Not drinking enough fluids

Electrolytes such as sodium, potassium and calcium are important for normal muscle and nerve function. Significant abnormalities can contribute to muscle symptoms.

If dehydration is severe, symptoms may include dizziness, confusion, fainting, rapid heartbeat or very little urine and require urgent medical attention.

How do I treat myalgia?

The right treatment depends on why the muscle pain is occurring.

For ordinary muscle soreness caused by overuse or a minor strain, treatment may include:

• Resting the affected muscles
• Avoiding the activity that triggered the pain temporarily
• Gentle movement and stretching as recovery progresses
• Applying cold packs during the early period after an acute injury
• Using heat later for stiffness or muscle tension
• Massage when appropriate
• Maintaining adequate hydration
• Gradually returning to normal activity

For recent injuries, cold therapy can help with pain and swelling, while heat may be more comfortable for older injuries or general stiffness.

If the pain is caused by an underlying condition, treating that condition is usually the most important part of management.

For example, a doctor may recommend appropriate treatment for a thyroid disorder, infection, vitamin deficiency, inflammatory muscle disease or medication-related problem.

What medication is used for myalgia?

For mild muscle pain, commonly used pain relievers may include paracetamol (acetaminophen) or, when medically appropriate, an NSAID such as ibuprofen.

However, these medicines aren’t suitable for everyone. NSAIDs, for example, may be unsuitable for some people with kidney disease, stomach ulcers, certain cardiovascular conditions or other medical problems.

The best medication depends on the cause and your overall health. Persistent pain may require prescription treatment, physiotherapy or treatment directed at the underlying condition.

Avoid taking pain medicines regularly without understanding why the pain is occurring.

What vitamin stops muscle pain?

There is no vitamin that universally stops muscle pain.

If muscle pain is caused by a confirmed vitamin deficiency, correcting that deficiency may improve symptoms. Vitamin D is particularly relevant when deficiency contributes to muscle weakness or musculoskeletal symptoms.

Taking large doses of vitamins without testing or medical advice is not necessarily helpful and can sometimes be harmful. The goal should be to identify and correct a genuine deficiency rather than treating every episode of muscle pain with supplements.

How is myalgia diagnosed?

There isn’t one single test that diagnoses every case of myalgia.

A healthcare professional will usually begin with a medical history and physical examination. You may be asked:

• When did the pain begin?
• Where exactly does it hurt?
• Is the pain localized or widespread?
• Did it start after exercise or an injury?
• Is it constant or intermittent?
• Does movement make it better or worse?
• Do you have fever, fatigue or other symptoms?
• Do you have muscle weakness?
• Have you recently started or changed any medicines?
• Have you experienced unusual physical exertion?

Depending on your symptoms, tests may include:

• Complete blood count
• Creatine kinase (CK)
• Electrolytes
• Kidney and liver function tests
• Thyroid tests
• Vitamin D testing
• Other vitamin or nutritional tests when appropriate
• Tests for infections or autoimmune conditions when clinically indicated
• Electromyography or nerve-conduction studies in selected cases

The tests are chosen based on the suspected cause rather than being performed routinely for every person with muscle pain.

How serious is myalgia?

Myalgia can range from completely temporary muscle soreness to a symptom of a significant medical condition.

For example, soreness after an unfamiliar workout is generally different from severe muscle pain accompanied by marked weakness, swelling, fever or dark urine.

You should seek medical attention if your pain:

• Is severe or unexplained
• Keeps getting worse
• Persists despite rest
• Continues for more than several days without an obvious reason
• Is accompanied by significant weakness
• Is associated with redness or swelling
• Appears after starting or changing a medicine
• Occurs with fever or other concerning symptoms

Sudden muscle weakness, difficulty breathing, difficulty swallowing, very severe symptoms or other serious systemic symptoms require urgent assessment.

What is the most painful body ache?

There is no single type of body ache that can objectively be called the most painful for everyone. Pain is highly individual, and its intensity depends on the underlying condition.

Some muscle problems can be extremely painful. Severe muscle cramps, significant muscle injuries and certain inflammatory or infectious conditions can cause intense discomfort.

More importantly, severe pain should be assessed in context. Pain accompanied by weakness, swelling, fever, breathing difficulty, chest symptoms or dark urine may require urgent medical evaluation.

Does myalgia go away on its own?

Often, yes.

Myalgia caused by exercise, minor strain, temporary stress or a short-lived infection commonly improves as the underlying trigger resolves. Cleveland Clinic notes that muscle pain from temporary causes often improves with rest and home care.

However, persistent pain should not automatically be assumed to be harmless.

If muscle pain continues, repeatedly returns, becomes more severe or has no obvious explanation, a medical evaluation can help identify the underlying cause.

When should you see a doctor for muscle pain?

Consider seeing a healthcare professional if your muscle pain is unexplained, severe, persistent or interfering with everyday activities.

You should be particularly cautious if muscle pain occurs together with:

• Muscle weakness
• High fever
• Significant swelling or redness
• Shortness of breath
• Chest pain or pressure
• Difficulty swallowing
• Reduced urine output
• Dark-coloured urine
• Severe fatigue
• A new medication or change in medication

Chest pain, breathing difficulty or sudden severe weakness can represent an emergency and should not be attributed simply to myalgia.

How can you prevent myalgia?

Not every cause of myalgia can be prevented, but several everyday habits can reduce the likelihood of muscle strain.

Warm up before exercise

Gradually prepare your muscles before strenuous activity rather than suddenly moving from rest to intense exercise.

Increase exercise gradually

Avoid making large increases in workout duration or intensity.

Stay hydrated

Drink enough fluids, particularly during exercise, hot weather or periods of heavy sweating.

Take breaks from prolonged sitting

If you work at a desk, get up regularly and move your body. Long periods in one position can contribute to muscle stiffness and discomfort.

Prioritize recovery

Adequate sleep, rest days and sensible progression are important parts of physical recovery.

Don’t ignore persistent pain

Continuing to repeatedly stress an injured muscle can prolong recovery. Persistent or unexplained pain deserves assessment rather than simply being masked with painkillers.

Frequently asked questions about myalgia

Is myalgia the same as muscle pain?

Yes. Myalgia is the medical term for muscle pain or muscle ache. It is a symptom rather than a specific disease.

What is the most common cause of myalgia?

For localized muscle pain, common causes include overuse, physical strain, tension and minor injuries. Widespread myalgia may have different causes, including infections and systemic health conditions.

What are the three types of myalgia?

There is no universally accepted three-type classification. For general understanding, myalgia can be described as localized, diffuse/widespread or recurrent/chronic, depending on where and how long the pain occurs.

Can dehydration cause myalgia?

Yes. Dehydration and associated electrolyte disturbances can contribute to muscle cramps and muscle discomfort.

What vitamin deficiency causes muscle pain?

Vitamin D deficiency can cause muscle weakness and musculoskeletal symptoms, particularly when deficiency is significant. Other nutritional or electrolyte abnormalities can also contribute to muscle symptoms.

What vitamin stops muscle pain?

No vitamin is a universal treatment for myalgia. If testing confirms a vitamin deficiency that is contributing to the symptoms, correcting that deficiency may help.

What drugs cause myalgia?

Statins are a well-known cause of medication-associated muscle pain. Other medicines can also cause muscle symptoms in some people. Don’t discontinue a prescribed medication without speaking with your doctor.

What medication is used for myalgia?

Depending on the cause and the individual’s health, treatment may involve paracetamol/acetaminophen or an NSAID such as ibuprofen for short-term relief. The underlying cause should be addressed when necessary.

How do I treat myalgia at home?

For mild muscle soreness caused by overuse, rest, gentle stretching, appropriate cold or heat therapy, hydration and gradual return to activity may help. If pain is severe, persistent or unexplained, consult a healthcare professional.

How is myalgia diagnosed?

Diagnosis usually starts with your medical history and physical examination. Depending on the suspected cause, a doctor may recommend blood tests such as CK, electrolytes, thyroid tests or vitamin levels, as well as other investigations when appropriate.

Does myalgia go away on its own?

Many cases do, particularly when caused by exercise, minor muscle strain or a temporary infection. Persistent or unexplained muscle pain should be evaluated.

Is myalgia serious?

It can be minor or significant depending on the cause. Temporary soreness after exercise is generally different from severe muscle pain accompanied by weakness, swelling, fever or other concerning symptoms.

Final thoughts

Myalgia is a common symptom, but the cause matters. A sore muscle after exercise may simply need time, rest and recovery. On the other hand, persistent or widespread muscle pain may point toward an infection, medication side effect, nutritional deficiency, thyroid disorder, inflammatory condition or another underlying problem.

Don’t assume that every muscle ache requires medication or supplements. Pay attention to how long the pain lasts, where it occurs, what triggered it and whether other symptoms are present.

If your muscle pain is severe, persistent, unexplained or accompanied by weakness or other concerning symptoms, speak with a healthcare professional for an appropriate evaluation.

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Disclaimer:
No content on this site, regardless of date, should ever be used as a substitute for direct medical advice from your doctor or other qualified clinician.

 

Sources and further reading

• Cleveland Clinic – Myalgia (muscle pain)
• Johns Hopkins Medicine – Myalgia
• MedlinePlus – Muscle aches
• NIH Office of Dietary Supplements – Vitamin D
• NHS – Statins and side effects