
Muscle weakness is a common symptom with many possible causes. It occurs when your muscles can't work with the expected amount of force, and it's different from feeling tired or fatigued. Muscle weakness can be caused by various factors, including age, inactivity, certain medications, and underlying health conditions. In some cases, it may be a sign of something more serious, such as a stroke or spinal cord injury. If you're experiencing muscle weakness, it's important to consult a healthcare professional to determine the underlying cause and receive appropriate treatment. They will likely perform an examination, ask about your medical history, and may order tests to evaluate muscle strength. Treatment options depend on the cause and can include physical therapy, strength training, and in some cases, medical intervention.
| Characteristics | Values |
|---|---|
| Muscle weakness | Occurs when your muscles can't work with the expected amount of force |
| Feeling tired, fatigued or worn out | Not the same as muscle weakness |
| Muscle fatigue | A symptom that decreases your muscles' ability to perform over time |
| Muscle inflammation | Caused by infections and illnesses |
| Muscle injury | Bleeding from damaged muscle fibres occurs inside the muscle, followed by swelling and inflammation |
| Muscle strain or tear | Caused by lifting something heavy or repetitive work |
| Muscle pain | Caused by overuse or chronic pain |
| Muscle weakness due to ageing | Doctors call this sarcopenia |
| Muscle weakness due to medications | Corticosteroids, cholesterol-lowering statins, and recreational drugs |
| Muscle weakness due to neurological conditions | Multiple sclerosis (MS), amyotrophic lateral sclerosis (ALS), myasthenia gravis, and more |
| Muscle weakness due to electrolyte imbalances | Hypokalemia, hypomagnesemia, hypercalcemia |
| Muscle weakness due to thyroid conditions | Hypothyroidism, hyperthyroidism |
| Muscle weakness due to infections | COVID-19, influenza, chronic fatigue syndrome |
| Muscle weakness during pregnancy | High levels of steroids and anaemia |
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What You'll Learn
- Muscle weakness can be a sign of a serious health condition, such as multiple sclerosis (MS), amyotrophic lateral sclerosis (ALS), or a stroke
- Age-related muscle loss (sarcopenia) can cause weakness and usually starts in a person's 60s or 70s
- Certain medications can cause muscle weakness, including corticosteroids and cholesterol-lowering statins
- Muscle strain or tears can lead to weakness and can occur during heavy lifting or repetitive work
- Infections, such as the flu, COVID-19, or other viruses, can cause temporary muscle weakness

Muscle weakness can be a sign of a serious health condition, such as multiple sclerosis (MS), amyotrophic lateral sclerosis (ALS), or a stroke
Muscle weakness can be a symptom of many health conditions, some more serious than others. It is important to note that muscle weakness is different from fatigue or pain. While it is normal to lose some muscle mass and strength with age, sudden or persistent muscle weakness could be a sign of an underlying health condition.
Multiple sclerosis (MS) is an autoimmune disorder where the immune system attacks and damages the nerves in the brain and spinal cord. This damage interrupts nerve communication with the muscles, resulting in weakness. Amyotrophic lateral sclerosis (ALS), also known as Lou Gehrig's disease, is a progressive neurological disorder that affects the nerve cells controlling voluntary muscle movement and breathing. As these motor neurons degenerate, they stop sending messages to the muscles, causing weakness and atrophy. In addition to muscle weakness, ALS patients may experience difficulty with speech, swallowing, breathing, and performing daily activities.
Muscle weakness can also be a sign of a stroke. During the stroke rehabilitation process, occupational therapy and exercises can help address weakness on one side of the body and improve motor skills. Certain autoimmune diseases, such as Graves' disease, myasthenia gravis, and Guillain-Barré syndrome, can also lead to muscle weakness. Myasthenia gravis causes the immune system to attack a person's muscles, affecting movement and breathing. In addition, some viral infections, such as COVID-19 and influenza, can cause temporary muscle weakness, usually accompanied by other symptoms such as coughing, fever, and fatigue.
If you are experiencing muscle weakness, it is important to consult a healthcare professional, especially if the weakness is sudden, persistent, or accompanied by other concerning symptoms. They will be able to conduct a thorough examination, ask about your medical history, and recommend appropriate tests to determine the underlying cause.
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Age-related muscle loss (sarcopenia) can cause weakness and usually starts in a person's 60s or 70s
Muscle weakness can be caused by a variety of factors, including illness, injury, and certain health conditions. One common cause of muscle weakness is age-related muscle loss, known as sarcopenia. This condition typically affects individuals in their 60s or 70s, but it can start as early as the 30s or 40s. Sarcopenia is characterised by a progressive loss of muscle mass, strength, and function, leading to symptoms such as muscle weakness, loss of stamina, difficulty performing daily activities, and an increased risk of falls and fractures.
Sarcopenia is considered a natural part of the ageing process, with muscle mass decreasing by approximately 3-8% per decade after the age of 30. This rate of decline accelerates after the age of 60, and the condition is more prominent in men, who are estimated to lose about 30% of their muscle mass over their lifetimes. The development of sarcopenia is influenced by various factors, including reductions in basal muscle protein synthesis, endocrine function, physical activity, and appropriate nutrition. Hormonal changes, such as decreased testosterone and insulin-like growth factor (IGF-1) levels, also play a role in the progression of sarcopenia.
The main symptom of sarcopenia is muscle weakness, which can impact an individual's quality of life by reducing their ability to perform daily tasks. Other symptoms may include walking slowly, trouble climbing stairs, poor balance, and a decrease in muscle size. The condition can be treated and even reversed through behavioural interventions and pharmacological agents. Progressive resistance training and a higher-protein diet have been shown to be effective in rebuilding and maintaining muscle mass.
It is important to note that muscle weakness can also be caused by other health conditions, such as multiple sclerosis, amyotrophic lateral sclerosis (ALS), myasthenia gravis, and Guillain-Barré syndrome. Certain medications, viral infections like COVID-19, and physical inactivity due to illness or injury can also contribute to muscle weakness. If you are experiencing muscle weakness, it is recommended to consult with a healthcare professional for a proper diagnosis and treatment plan.
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Certain medications can cause muscle weakness, including corticosteroids and cholesterol-lowering statins
Muscle weakness can be caused by a variety of factors, and certain medications are among these causes. Corticosteroids like prednisone and cholesterol-lowering statins are known to cause muscle weakness in some individuals.
Statins are a class of drugs commonly prescribed to lower cholesterol levels in the body. While generally well-tolerated, statins have been associated with muscle pain and weakness in some patients. This side effect is believed to be related to the drug's impact on muscle enzymes and proteins. For instance, statins can increase the levels of creatine kinase (CK), which in elevated amounts can lead to muscle inflammation, pain, and weakness. This condition is known as myositis. Additionally, statins may also increase the risk of rhabdomyolysis, a severe condition characterized by extreme muscle inflammation and damage, resulting in muscle weakness throughout the body.
The combination of statins with other medications, such as fibrates (used for cholesterol reduction), can further elevate the risk of muscle damage and weakness. It is important to consult a doctor if you experience any unexplained muscle weakness while taking statins, as these side effects can have serious implications for kidney health if left untreated.
Corticosteroids, such as prednisone, are another class of drugs that may induce muscle weakness. Corticosteroids are prescribed for a variety of conditions, including inflammation and autoimmune disorders. While generally safe, prolonged use of these medications can lead to muscle weakness as a side effect. The mechanism behind this side effect is not yet fully understood, but it is believed that corticosteroids may impact muscle function by altering the body's electrolyte balance or affecting nerve transmission to the muscles.
It is important to note that not everyone who takes these medications will experience muscle weakness. However, if you are taking corticosteroids or statins and are concerned about muscle weakness, it is advisable to consult your doctor or pharmacist. They can assess your symptoms, review your medication regimen, and advise any necessary adjustments or additional treatments to help manage this side effect.
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Muscle strain or tears can lead to weakness and can occur during heavy lifting or repetitive work
Muscle weakness can be caused by several factors, ranging from lifestyle habits to underlying health conditions. One common cause of muscle weakness is muscle strain or tears, which can occur during heavy lifting or repetitive work.
Muscle strains, also known as pulled muscles, are injuries to the muscle fibres that can range from minor to major tears. They are often associated with sports injuries caused by sudden movements like sprinting, twisting, or jumping. However, they can also occur during everyday activities, especially when proper precautions are not taken. For example, when lifting heavy objects, failing to keep your back straight, bend at the knees, and lift with your legs can increase the risk of straining your back muscles. Similarly, repetitive motions, such as typing on a keyboard or holding awkward positions for extended periods, can create weakness and stiffness in the affected muscles over time.
The symptoms of a muscle strain can vary depending on the severity of the injury. Acute muscle strains involve a sudden and unexpected tear in the muscle, often resulting in immediate pain that may feel like tearing. On the other hand, chronic muscle strains develop gradually over time due to repetitive movements. While they may cause less immediate pain, they can lead to soreness and weakness in the affected muscles.
To prevent muscle strains, it is essential to take precautions such as maintaining good posture, taking frequent breaks during repetitive tasks, and properly warming up before engaging in physical activities, especially in cold weather. Additionally, building strong and healthy muscles through regular exercise can also reduce the likelihood of developing muscle strains.
If you experience a muscle strain, the treatment will depend on its severity. Minor strains can often be treated at home with rest, ice, compression, and elevation (RICE). However, more severe strains may require medical attention, including physical therapy or even surgery in rare cases. During recovery, it is crucial to gradually increase your activity levels and include stretching to improve blood flow and reduce the risk of re-injury.
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Infections, such as the flu, COVID-19, or other viruses, can cause temporary muscle weakness
Muscle weakness can be caused by a variety of factors, including infections such as the flu, COVID-19, and other viruses. While it is more common to lose muscle strength gradually over time, sudden muscle weakness can be a symptom of an underlying condition or infection.
Infections such as the flu or a common cold can leave you feeling weak and tired, and these symptoms can linger for a couple of weeks. In some cases, viruses can infect the muscle itself and cause weakness. This is more likely to occur in individuals who have other underlying health issues. COVID-19, for example, can cause muscle weakness, along with other symptoms such as coughing, fever, and fatigue. A severe case of COVID-19 or any other illness that requires an extended period of bed rest can lead to a rapid loss of muscle strength.
Other infections that can cause muscle weakness include Lyme disease, transmitted by tick bites, and meningitis, a serious infection causing inflammation in the brain and spinal cord. HIV, if left untreated, can also lead to progressive muscle weakness. Additionally, polio myositis and post-polio syndrome are associated with muscle weakness and sensitivity.
Infections are not the only cause of muscle weakness. It can also be a result of a lack of use, age, or certain medications. Muscle weakness can be a symptom of more serious conditions, such as multiple sclerosis, amyotrophic lateral sclerosis (ALS), or Guillain-Barré syndrome. If you are experiencing sudden or persistent muscle weakness, it is important to consult a healthcare professional for an accurate diagnosis and appropriate treatment.
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Frequently asked questions
Infections and illnesses are among the most common causes of temporary muscle fatigue. This is usually through muscle inflammation. Even though recovery is usual, if inflammation is severe, the weakness can last for several weeks.
As you exercise, your muscles may begin to feel weaker and tired. This is muscle fatigue. Staying hydrated, maintaining a healthy diet, and stretching before and after exercise can improve recovery time and protect against muscle fatigue and weakness.
Muscle weakness can be caused by an injury or trauma, such as a sporting injury, pull, or sprain. It can also be caused by a stroke, spinal cord injury, or nerve damage. If you experience sudden muscle weakness, seek medical attention right away.
Muscle weakness can be a symptom of many chronic diseases, such as peripheral arterial disease, chronic kidney disease, diabetes, fibromyalgia, or hypothyroidism. It can also be caused by certain medications or electrolyte imbalances. If you experience persistent muscle weakness, consult your healthcare provider.










































