Dominic Stone
Muscle weakness is a common symptom with many potential causes, ranging from a tough workout to a serious nervous system issue or other medical conditions. It is characterised by a lack of muscle strength, which can make everyday tasks more difficult. Muscle weakness can affect people of all ages, but it tends to become more common with age, as muscles naturally lose strength and bulk. It can also be caused by certain medications, such as steroids, statins, and cholesterol-lowering drugs. In some cases, muscle weakness can be a sign of a more serious health condition, such as multiple sclerosis (MS), amyotrophic lateral sclerosis (ALS), or muscular dystrophy, and it is important to seek medical advice if you are concerned about any sudden or persistent muscle weakness.
| Characteristics | Values |
|---|---|
| Definition | Lack of muscle strength |
| Cause | Muscle cells not working properly, nerve signals not being transmitted, injury, disease, ageing, lack of exercise, etc. |
| Symptoms | Muscles not contracting or moving easily, fatigue, pain, difficulty in performing everyday tasks |
| Diagnosis | Doctors may conduct muscle strength tests, blood tests, etc. |
| Treatment | Physical therapy, medication, regular exercise, etc. |
| Prevention | Regular exercise, balanced diet, avoiding heavy steroid use, etc. |
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What You'll Learn
Muscle weakness and ageing
Muscle weakness refers to a lack of muscle strength, which can make it difficult for muscles to contract or move as they usually would. This can manifest as a difficulty in performing tasks that were previously manageable, such as getting up from a chair, climbing stairs, or opening a jar.
Muscle weakness can be acute or chronic, and it is normal to experience some degree of muscle weakness as we age. Doctors refer to age-related muscle weakness as sarcopenia, which is a common condition characterised by the loss of muscle mass and strength. Sarcopenia typically becomes noticeable in a person's 60s or 70s, and it can reduce one's quality of life and lifespan. It is caused by a decrease in muscle fibres and muscle oxidative capacity, which leads to a reduction in involuntary force production per unit of muscle. The speed and extent of muscle changes appear to be influenced by genes, with muscle changes often beginning in the 20s for men and 40s for women.
Ageing also brings about changes in posture and gait, which can affect one's balance and flexibility. Bones become more brittle and prone to breakage, and overall height decreases due to the loss of fluid and thinning of discs in the spine. The feet also become less arched, contributing to the loss of height.
To prevent and manage muscle weakness due to ageing, staying active is crucial. Regular exercise, including moderate activities like walking, can help reduce muscle loss and maintain strength, balance, and flexibility. Resistance exercises, such as using resistance bands, lifting weights, or performing calisthenics (e.g., squats, push-ups, sit-ups), are particularly effective in combating sarcopenia. Additionally, consuming a well-balanced diet with adequate calories and protein, and specific nutrients like vitamin D and omega-3 fatty acids, can help improve muscle mass and strength.
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Muscular dystrophy
Muscle weakness can manifest in many ways, from trouble performing daily activities to a sudden severe onset of weakness. It can be caused by a variety of factors, ranging from a tough workout to underlying health conditions.
- Becker muscular dystrophy, which is the second most common type and can appear any time between the ages of 5 and 60, but typically starts in the teenage years.
- Myotonic dystrophy, which is the most common type diagnosed in adulthood and affects both men and women equally. People with myotonic dystrophy have difficulty relaxing their muscles after using them, and it can also affect the heart, lungs, and endocrine system.
- Congenital muscular dystrophies, which cause overall muscle weakness and possible joint stiffness or looseness, with symptoms present from birth or before the age of 2.
- Facioscapulohumeral muscular dystrophy, which affects the muscles in the face, shoulders, and upper arms, with symptoms typically appearing before the age of 20.
- Limb-girdle muscular dystrophy, which affects the muscles in the upper arms, upper legs, shoulders, and hips, and can cause minor disabilities or serious trouble with everyday activities.
- Oculopharyngeal muscular dystrophy, which weakens the muscles in the eyelids and throat, causing droopy eyelids and difficulty swallowing, with symptoms often appearing in middle age.
While there is no cure for muscular dystrophy, medicines and other treatments can help manage the symptoms and slow the progression of the disease.
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Infectious conditions
Muscle weakness can be caused by a variety of infectious conditions, including:
Viral Infections
Viral infections such as the flu, HIV, and influenza can cause muscle weakness. In the case of HIV, untreated individuals may experience progressive muscle weakness. Some people develop myositis, a chronic muscle inflammation, after a viral infection such as the common cold or influenza.
Bacterial Infections
Bacterial pyomyositis is a bacterial infection that can cause muscle weakness. Lyme disease, transmitted by infected ticks, can also lead to muscle weakness and other acute or chronic symptoms.
Parasitic Infections
Parasitic infections such as trichinosis, toxoplasmosis, and cysticercosis can result in muscle weakness.
Fungal Infections
Fungal infections, including Candida and Coccidiomycosis, can also cause muscle weakness.
Critical Illness Myopathy
Critical illness myopathy develops in patients admitted to intensive care units (ICUs). It is caused by prolonged immobility and certain medications such as muscle relaxants and corticosteroids. Critically ill patients in ICUs experience muscle weakness due to a lack of use, losing about 2% of skeletal muscle per day during the first week of admission on average.
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Nervous system conditions
Muscle weakness can be caused by a variety of nervous system conditions. Neuromuscular disorders, for instance, are a broad category of neurological disorders that involve dysfunction of peripheral nerves, muscles, or the communication between them. When neurons become unhealthy or die, communication between the nervous system and muscles breaks down, resulting in muscle weakness and atrophy. Neuromuscular disorders can be inherited or caused by a spontaneous gene mutation, immune system disorders, injury, nutritional or metabolic disturbances, toxin exposure, or inflammation. Some neuromuscular disorders include muscular dystrophies, multiple sclerosis (MS), amyotrophic lateral sclerosis (ALS), autoimmune diseases such as Graves' disease, myasthenia gravis, and Guillain-Barré syndrome.
Guillain-Barré syndrome, a rare neurological disorder, can cause mild to severe muscle weakness. Botulism, another rare condition, occurs due to exposure to botulinum toxin and causes progressive muscle weakness. Lambert-Eaton myasthenic syndrome is an autoimmune disorder where the immune system interferes with nerve and muscle communication, resulting in muscle weakness. Multiple sclerosis (MS) is an autoimmune disorder where the immune system attacks and damages nerves in the brain and spinal cord. Amyotrophic lateral sclerosis (ALS) leads to degeneration of nerve cells in the brain and spinal cord, causing progressive muscle weakness. Myasthenia gravis is an autoimmune disorder where the immune system attacks a person's muscles, affecting movement and breathing. Spinal cord injuries can interrupt communication from nerves to muscles, resulting in muscle weakness.
In addition to these neurological conditions, cervical spondylosis, age-related changes to the cushioning spinal disks in the neck, can put extra pressure on nerves and result in muscle weakness. Polio myositis can cause muscle weakness and sensitivity, and individuals who have had polio may experience post-polio syndrome, which also results in muscle weakness. Rabies, resulting from contact with the saliva of an infected animal, can also cause muscle weakness.
Muscle weakness can also be caused by other factors, such as aging, lack of use, or as a side effect of certain medications. It is important to consult a doctor if you are experiencing persistent muscle weakness to rule out any underlying health conditions and determine an appropriate treatment plan.
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Medication and substance use
Prescribed medications that can cause muscle weakness include statins, fibrates, and cholesterol-lowering drugs, such as simvastatin and atorvastatin. Fibrates, such as fenofibrate and gemfibrozil, are also known to cause muscle weakness. Antiarrhythmic medicines, like amiodarone and procainamide, used to treat heart rhythm problems, can also lead to muscle weakness. Corticosteroids, particularly prednisone, when taken in high doses and for prolonged periods, can cause muscle weakness. Other commonly used medicines that can cause muscle weakness include some antibiotics, such as ciprofloxacin and penicillin, and anti-inflammatory painkillers like naproxen and diclofenac. Long-term use of oral steroids or high doses of steroids can also lead to muscle weakness and wasting.
Substance abuse can also contribute to muscle weakness. Chronic alcohol use can compromise the brain, particularly the anterior portion, the right hemisphere, and the cerebellum, which can directly affect muscle function. Opiate drugs, such as heroin, Vicodin, and OxyContin, are central nervous system depressants that can increase the risk of stroke and compromise the functioning of the cardiovascular system. Similarly, chronic use of powerful stimulants like methamphetamine and cocaine can produce brain damage, compromising the musculoskeletal system. Inhalants, such as aerosols, spray paints, markers, and cleaners, can also lead to brain damage and compromise the muscular system.
It is important to note that not all individuals who take the aforementioned medications will develop myopathy or muscle weakness. However, anyone experiencing muscle weakness as a side effect should consult a doctor. Discontinuing or lowering the dose of the offending medication may be recommended, but this should be done under medical supervision.
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Frequently asked questions
Muscle weakness can manifest in different ways, depending on the underlying cause. It is characterized by a reduction in muscle strength and the ability to generate force, which can make everyday tasks difficult. It can affect a specific muscle group or be more generalized.
Muscle weakness has a wide range of causes, from temporary and treatable conditions to more serious underlying health issues. Common causes include:
- Muscle injuries, strains, or tears
- Infections, such as the flu, Lyme disease, or COVID-19
- Neurological disorders, such as Guillain-Barré syndrome or multiple sclerosis (MS)
- Autoimmune disorders, such as myasthenia gravis or Lambert-Eaton myasthenic syndrome
- Spinal cord injuries or nerve damage
- Metabolic issues, such as diabetes, anemia, or electrolyte imbalances
- Prolonged inactivity or bed rest
- Medications, such as steroids, heart medicines, or chemotherapy drugs
The main symptom of muscle weakness is a noticeable reduction in muscle strength and performance. This may be accompanied by other symptoms, depending on the underlying cause. For example, in the case of a stroke, muscle weakness often affects one side of the body. Other signs may include fatigue, pain, balance issues, or endurance problems.
It is advisable to consult a healthcare professional if you experience sudden or persistent muscle weakness without an apparent cause. They can perform examinations, order tests, and determine an appropriate treatment plan. Seek immediate medical attention if you suspect a stroke or other medical emergency.
The treatment for muscle weakness depends on the underlying cause and may involve medications, physical therapy, or occupational therapy. In some cases, assistive devices may be recommended to aid with daily activities. Regular exercise and stretching can help prevent future injuries and improve muscle strength.
