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Muscle weakness can be caused by a variety of factors, ranging from temporary illnesses to underlying medical conditions. Temporary causes include the flu, a cold, or COVID-19, which can leave you feeling weak and tired. Certain medications, strains, tears, and repetitive work can also lead to muscle weakness. Additionally, aging can cause a decrease in muscle mass and strength, known as sarcopenia, which may be accompanied by other health conditions that contribute to inactivity. In some cases, muscle weakness may be a symptom of a more serious medical issue, such as neurological or autoimmune disorders, thyroid conditions, electrolyte imbalances, or injuries to the spinal cord or nervous system. It is important to consult a doctor if muscle weakness persists or interferes with daily activities.
| Characteristics | Values |
|---|---|
| Muscle atrophy | Disuse atrophy, neurogenic atrophy |
| Disuse atrophy causes | Sedentary lifestyle, malnourishment, lack of exercise, desk job, old age, genetic disorders, stroke, dermatomyositis |
| Neurogenic atrophy causes | Nerve problems, nerve diseases |
| Muscle weakness | Temporary, treatable |
| Muscle weakness causes | Aging, illness, nerve signals interrupted, autoimmune conditions, inflammatory diseases, neurological conditions, medication, muscle strain, muscle tear, injury, muscle cells not working properly |
| Muscle weakness symptoms | Numbness, tingling, trouble walking or balancing, difficulty swallowing or speaking, fatigue, pain |
| Muscle weakness treatments | Strength training, physical therapy, exercise, rest, icing |
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What You'll Learn
Muscle atrophy
There are three types of muscle atrophy: physiologic, pathologic, and neurogenic. Physiologic atrophy, or disuse atrophy, is caused by not using the muscles enough. This can be due to a sedentary lifestyle, malnourishment, old age, or being bedridden while recovering from an injury or illness. Physiologic atrophy can often be reversed with exercise and better nutrition.
Pathologic atrophy is seen with ageing, starvation, and diseases such as Cushing's disease, which is caused by taking too much corticosteroid medication.
Neurogenic atrophy is caused by an injury to, or disease of, a nerve that connects to the muscle. This type of atrophy can occur due to nerve problems or diseases such as amyotrophic lateral sclerosis (ALS), also known as Lou Gehrig's disease, which affects nerve cells that control voluntary muscle movement. Other conditions that can cause neurogenic atrophy include muscular dystrophy, multiple sclerosis, and spinal muscular atrophy. Neurogenic atrophy is the most severe type and tends to occur more suddenly than physiologic atrophy.
The symptoms of muscle atrophy include a decrease in muscle mass, one limb being smaller than the other, weakness, numbness, or tingling in the limbs, trouble walking or balancing, and difficulty swallowing or speaking. Treatment for muscle atrophy depends on the underlying cause and the severity of the condition. It may include physical therapy, ultrasound therapy, dietary changes, nutritional intervention, functional electrical stimulation, and in some cases, surgery.
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Neurological conditions
Neuromuscular disorders are a group of conditions that affect the nerves, muscles, or the communication between them. They can be caused by a variety of factors, including inherited disorders, hormonal disorders, autoimmune disorders, and side effects of certain medications.
One example of a neuromuscular disorder is muscular dystrophy, which is a group of inherited diseases that cause muscle weakness and wasting away of muscle tissue. There are multiple types of muscular dystrophy, each leading to a loss of strength, increasing disability, and possible deformity. The most common form is Duchenne muscular dystrophy, followed by Becker muscular dystrophy.
Another example is periodic paralysis, which involves episodes where the muscles become slack, weak, and unable to contract. This is caused by inherited neurological disorders. Toxic myopathies are another type of neuromuscular disorder, caused by toxins or medications interfering with muscle structure or function. Peripheral neuropathy is the most common type of neuromuscular disorder, often caused by abnormal enzymes or autoimmune conditions.
Symptoms of neuromuscular disorders can vary from mild to life-threatening and may include muscle weakness, pain, and spasms. Diagnosis is made through a range of tests, including electromyography (EMG), nerve conduction studies, blood tests, imaging tests, muscle biopsies, and genetic testing. While there is currently no cure for neuromuscular disorders, treatments such as medication, physical therapy, and surgery can help manage symptoms and slow down disease progression.
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Illness and injury
Infections such as a cold, flu, or COVID-19 can cause muscle weakness, but this is usually temporary and will resolve as the illness passes. Some viruses can infect the muscle itself, causing weakness.
Neurological conditions that affect the brain, nervous system, muscles, or the connections between them can cause muscle weakness. Examples include multiple sclerosis (MS), amyotrophic lateral sclerosis (ALS), myasthenia gravis, and Guillain-Barré syndrome. Nervous system conditions can cause long-lasting muscle weakness and are often progressive, getting worse over time. Spinal cord injuries can also interrupt nerve signals to the muscles, resulting in muscle weakness.
Autoimmune diseases, such as Graves' disease, myasthenia gravis, and Guillain-Barré syndrome, can cause the immune system to attack the body's muscles, leading to muscle weakness.
Electrolyte imbalances, such as hypokalemia (potassium deficiency) and hypercalcemia (elevated calcium levels), can affect the function of the muscles, nerves, heart, and brain, resulting in muscle weakness.
Certain medications can also cause muscle weakness as a side effect, including corticosteroids and cholesterol-lowering statins.
Muscle atrophy or weakness can also occur due to disuse or physiologic atrophy, which is caused by not using the muscles enough. This can be a result of a sedentary lifestyle, old age, or being bedridden due to illness or injury. Leading a sedentary lifestyle or having a desk job can contribute to disuse atrophy.
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Lack of exercise
Muscle weakness can be caused by a lack of exercise. When you abruptly cut down on physical activity, your body undergoes biological changes that can negatively impact your health. Within the first few days, you may experience an increased active heart rate and a loss of endurance. Within the first weeks, your body starts to undergo biological changes in muscle size that can lead to weight gain. This is because, as muscle cells get smaller, fat cells get bigger, and the muscles aren't working hard enough to burn away calories.
Over the long term, physical inactivity can lead to major health risks, including heart disease, diabetes, and early death. Lack of exercise can also cause muscle atrophy, or muscle wasting, which is the loss or thinning of muscle tissue. This can be caused by not using your muscles enough, leading to a decrease in size and strength. This type of atrophy can be reversed with exercise and a healthy diet.
If you are experiencing muscle weakness, it is important to see a doctor. They can evaluate your medical history and symptoms to determine the underlying cause. They may also suggest seeing a physical therapist, who can recommend exercises to improve your muscle strength and quality of life. Regular exercise can help prevent or slow muscle loss and weakening as you age.
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Age and genetics
Muscle failure can be attributed to several factors, including age and genetics. Age-related muscle loss, known as sarcopenia, is a common condition characterised by a gradual decline in muscle mass, strength, and function. The onset of sarcopenia typically begins around the age of 40, with an accelerated loss of muscle mass after the age of 60. The rate of muscle loss varies, but individuals may lose up to 8% of their muscle mass per decade, with studies suggesting that between 11% and 50% of people over the age of 80 are affected by sarcopenia.
The ageing process results in various biological changes that contribute to sarcopenia. One key change is a decrease in the body's ability to produce the proteins essential for muscle growth. This leads to a reduction in muscle cell size and, consequently, overall muscle mass. Ageing is also associated with changes in hormone levels, particularly testosterone, insulin-like growth factor (IGF-1), and growth hormones, which play a crucial role in muscle fibre development. Additionally, ageing increases the production of oxygen free radicals, highly reactive molecules that damage muscle cells and further contribute to muscle weakness.
Genetics can also play a role in muscle failure. Certain genetic disorders, such as muscular dystrophy, Charcot-Marie-Tooth disease, and Duchenne muscular dystrophy, can lead to muscle atrophy and weakness. These genetic conditions affect the nerves that control muscle contractions, resulting in reduced muscle function and strength.
While age and genetics are significant factors in muscle failure, it is important to note that lifestyle choices and environmental factors also contribute to muscle weakness and atrophy. Physical inactivity, sedentary lifestyles, and inadequate nutrition, particularly a lack of protein, are common factors that interact with age and genetics to influence muscle health.
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Frequently asked questions
Muscle weakness can be caused by a variety of factors, ranging from temporary issues like a cold, flu, or lack of exercise, to more serious underlying medical issues like neurological conditions, autoimmune diseases, or genetic disorders. Aging is also a common cause of muscle weakness.
Muscle weakness can manifest as a decrease in muscle mass, numbness or tingling in the limbs, and difficulty with tasks that previously caused no issues, such as opening a jar, climbing stairs, or getting up from a chair. It is important to note that muscle weakness is distinct from fatigue or pain.
If you are experiencing muscle weakness, it is recommended to consult a healthcare professional, especially if it lasts for more than a few days or interferes with your daily routine. They will be able to determine the underlying cause and suggest appropriate treatments, which may include physical therapy, exercises, or medication adjustments. Strength training and regular exercise can also help improve muscle strength.
