Home Removal Severe muscle weakness. Muscle weakness in the legs and arms: causes, treatment and prevention Sudden weakness in the arms causes

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Severe muscle weakness. Muscle weakness in the legs and arms: causes, treatment and prevention Sudden weakness in the arms causes

Severe muscle weakness manifested by severe fatigue and muscle weakness. Often this symptom is one of the first signs.

How does severe muscle weakness manifest?

Muscle fatigue characterized by a pronounced decrease in strength in one muscle or several at once. It is very important to clearly distinguish between muscle weakness and the general state of fatigue, weakness and lethargy. Chronic muscle fatigue is felt both in a specific limb and in any other area of the body.

In medicine it is determined objective (V in this case during the study, the fact of a decrease in muscle strength is confirmed) and subjective (a person feels tired in a muscle, but the results of the study show that strength is preserved) muscle weakness. Classification related to the affected area is practiced. Varies localized And generalized forms of this disease.

This condition is characterized by rapid fatigue of the striated muscles, which will determine the functioning of the human musculoskeletal system. Quite often, a person, feeling weakness in the muscles of the arms or legs, only suffers from, so the doctor needs to be very careful in the process of making a diagnosis.

Often muscle weakness in the arms or muscle weakness in the legs is a symptom of a disease that is caused by autoimmune attacks of the body . This disease usually appears periodically. Exacerbations of the disease alternate with periods of remission. In patients with myasthenia gravis, the muscular system loses the ability to contract, as the person gradually loses muscle strength. In most cases, the disease affects young and middle-aged women, as well as men over 50 years of age.

Proximal muscle weakness appears mainly in the arms and legs, but sometimes it can be noted in both the upper and lower lower limbs.

A patient with this symptom often finds it difficult to move long distances or walk up stairs. In some cases, it is even difficult for such people to stand and sit. Often their gait takes on the characteristics of a so-called “duck” walk - they walk as if rolling from side to side. If the muscles of the foot are affected, then over time the person develops. Subsequently, a person may develop hyperparathyroidism - a disease associated with too active hormone production parathyroid hormone , which subsequently leads to the development hypercalcemia . In such patients, in addition to muscle weakness, there are disorders of the kidneys, gastrointestinal tract, and signs of changes in the nervous system.

Why does severe muscle weakness occur?

Causes of muscle weakness are related to various diseases and factors affecting the human body. Severe muscle weakness in older people and in patients over young can develop against the background of both muscle and mental illness. Causes of muscle weakness in the legs and arms are often associated with the development of myasthenia gravis. This disease is of an autoimmune nature. Myasthenia gravis affects synapses – places where nerves and muscles connect. Consequently, this process leads to innervation. Myasthenic syndrome often develops against the background tumors thymus gland , hyperplasia , as well as for some diseases nervous system person. Symptoms of muscle weakness associated with myasthenia gravis are more common in women. Sometimes this illness is a consequence of severe stress or past infectious disease. Muscle weakness is sometimes noted in children. As a rule, the manifestation of this symptom indicates the development dystrophy muscle tissue . A child with this symptom often has various types of disorders in the functions of the central nervous system, muscle development defects, or the presence of certain genetic disorders.

However, the causes of weakness in the arms and legs are not always associated with myasthenia gravis. If a person feels normal, but at the same time notices severe fatigue and weakness in the legs, then in some cases the manifestation of this symptom is explained by overwork, constant work in a standing position, or even regularly wearing not very comfortable shoes. In this case, the patient suffers from fatigue, rumbling in the legs, and fatigue. This symptom is most often observed in older people, but women who prefer high-heeled shoes often report fatigue and a feeling of weakness in the lower extremities. In addition, this phenomenon may be a sign , spinal diseases .

Weakness of the muscles of the neck, back, pelvic floor, limbs, etc. manifests itself not only as a result of an independent autoimmune disease, but can also be a symptom of certain diseases and pathological conditions. Often muscle weakness is observed with a constant protein deficiency, with the active development of inflammatory processes or infectious diseases, with intoxication or dehydration of the body. Patients with, illnesses thyroid gland . Muscle pain and weakness are a symptom of severe poisoning, an overdose of some medications. Weakness in the leg muscles is characteristic of. It should also be taken into account that in some cases the causes of muscle weakness are associated with the development asthenic syndrome . Significant feeling of fatigue in calf muscles a person sometimes notes, after experiencing stress, serious emotional overstrain.

Weakness of the heart muscle leads to the development heart failure and occurs against the background of many cardiovascular pathologies.

How to get rid of severe muscle weakness?

Treatment of muscle weakness always depends on the underlying disease and is prescribed only after a complete diagnosis and determination of the cause of the disease. For patients who suffer from myasthenia gravis, it is very important to establish a diagnosis as early as possible, since early stage the disease is treated more effectively. In the diagnostic process, both laboratory and instrumental methods research.

During therapy, the doctor prescribes symptomatic treatment, as well as a course of physiotherapeutic procedures that help restore the normal state of human muscles. However, as a rule, the disease has chronic course, so it is impossible to completely get rid of the symptoms. Medications and the doctor prescribes their regimen for patients with myasthenia gravis individually, since it is necessary to take into account the characteristics of the symptoms and course of the disease. Most patients are prescribed drugs that block the destroyers acetylcholine - a substance that is formed in the body and takes part in the transmission of impulses to the muscles.

If necessary, radical treatment methods are prescribed, in particular surgical removal thymus gland or its tumor. In some cases, radiation exposure is indicated. With proper treatment, most patients note a noticeable improvement in their general condition. However, periodic maintenance therapy is necessary throughout the patient's life.

The question of how to relieve muscle fatigue is also relevant for people who have fatigue and pain in limbs - This is a consequence of the influence of other factors. If constant pain and the feeling of fatigue is associated with general fatigue, it is necessary to reconsider your lifestyle, ensure regular good rest, and reduce stress. Often, rapid and very severe pain and fatigue in the muscles appears after training. It is important to take a responsible approach to the selection of exercises, taking into account the general condition of the body and the presence of chronic diseases. However, a person must constantly practice adequate physical activity.

It is important to balance your diet and constantly maintain the correct drinking regime to prevent dehydration. If necessary, you should take care of changing your shoes to more comfortable ones. Massage and a warm, relaxing bath help to effectively relieve fatigue.

If muscle weakness is associated with other diseases, you should definitely tell your doctor about this symptom, who will adjust the treatment regimen. Special attention Those who have weakness of the heart muscle should pay attention to their health status, since in the absence of proper treatment this condition can be life-threatening.

Weakness in the hand is limited ability moving your arm due to decreased strength or loss of muscle strength in your arm. Weakness in the arm may occur suddenly or gradually progress over time, and may be associated with muscle weakness in another part of the body. In some cases, arm weakness is accompanied by symptoms such as pain and/or numbness in the arm. If you have weakness in your arm, it may be the result of an injury to your arm or may indicate a medical condition.

Causes

Four common causes of arm weakness include:

Nerve compression

Nerve compression can occur peripherally or centrally. When it comes to compression peripheral nerve, this means that there is compression of the nerve in the arm itself. Any damage to the peripheral nerve can lead to problems with hand mobility. The patient may have difficulty straightening the arm at the elbow, and may experience symptoms such as burning, arm weakness, numbness, and decreased sensation. In most cases, recovery occurs on its own, although it is a slow process and no special treatment is necessary. However, sometimes it may be necessary surgical intervention to remove the fragment putting pressure on the nerve.

If we talk about compression of a nerve at the central level, this means that the nerve was compressed at the level of the spine. The spine is made up of small bones (vertebrae) that sit one above the other to form spinal column. Between the vertebrae there are intervertebral discs - gel-like “pads”, the main functions of which are to absorb pressure on the vertebrae and maintain mobility of the spine. The vertebral arches form the spinal canal - a hollow vertical tube in the center of the spine, inside which are the spinal cord and the roots extending from it spinal nerves. Over time, the structures of the spine begin to wear out and degenerative changes begin. The result of such changes may be the emergence intervertebral hernia(protrusion of a fragment of the intervertebral disc into the spinal canal) or osteophytes (overgrowth of the vertebrae). Both of these phenomena can lead to a pinched nerve at the level of the spine. Rarely, a pinched nerve root can be caused by a tumor in the lumen of the spinal canal or infectious process. Symptoms of a centrally pinched nerve may include pain and loss of mobility in the neck, pain, numbness in the shoulder, and pain, numbness, tingling, and weakness in the arm anywhere down to the hand and fingers. To make a correct diagnosis in such cases, it is necessary to conduct a study in which it is possible to obtain high-quality images of the bone and soft tissues of the spine, including nerves, intervertebral discs, vessels, muscles, ligaments and tendons. Treatment for nerve compression at the spinal level is usually conservative and may include, different kinds medical massage And therapeutic exercises, hirudotherapy, formation correct posture and development of the correct motor stereotype. In rare cases, surgery is necessary to remove the fragment compressing the nerve;

Stroke

A stroke is sudden death brain cells due to lack of oxygen and is caused by a ruptured artery or blockage of blood flow to a brain artery. Sudden paralysis or weakness in an arm may be a symptom of a stroke, and treatment may include constraint induced movement therapy. This therapy improves arm mobility by limiting the use of the less affected part of the body, forcing the patient to use the weakened part of the body. Electrical stimulation can also be used to improve sensation and strengthen the hand;

Hand injury

Fractures, muscle and ligament sprains are the most common types of hand injury. The nature and severity of symptoms accompanying an injury can vary significantly depending on the nature and severity of the injury itself. Minor injury Hand pain is most often caused by overuse of the hand or natural wear and tear of its tissues and structures. Fortunately, most minor injuries heal on their own, and often painkillers and rest are all that is needed to get back to normal and get rid of unpleasant symptoms;

Tendinitis

If pain, numbness and/or weakness in your arm gets worse when you perform repetitive movements during work or sports, you may be suffering from tendinitis, an inflammation of the ligament. If it hurts you to perform grasping movements (grasp an object), and the pain begins in the elbow and then radiates down the arm, perhaps the reason for this is the so-called. tennis elbow. Using anti-inflammatory medications, such as ibuprofen, can help relieve pain and reduce inflammation. In addition, applying an ice pack to the painful area and resting can give good results;

Other, rare causes of arm weakness include:

Amyotrophic lateral sclerosis (ALS)

ALS is a type of motor neuron disease that leads to gradual destruction and death nerve cells. ALS is characterized by the gradual destruction and death of nerve cells that transmit impulses from the brain or spinal cord to the muscle, which leads to the appearance of symptoms such as weakness in the arm, hand, leg, etc. Over time, all voluntary muscles are affected, and, ultimately, the person loses the ability to breathe without special equipment. Many people with ALS die within 3 to 5 years of the onset of symptoms from respiratory failure;

Guillain-Barré syndrome (GBS, acute polyradiculoneuritis)

GBS is a disease in which the immune system parts of the nervous system attack the person, causing symptoms such as weakness and tingling in the legs or feet, which can slowly spread to the top part body, leading to weakness in the arms. The intensity of symptoms may increase over time, to the point where the use of some muscles becomes impossible. With severe GBS, a person may become almost completely paralyzed. GBS can be life-threatening because it can potentially interfere with breathing. However, most patients recover well even after severe violations, although some may still have some weakness in certain muscles;

Myasthenia gravis

Myasthenia gravis is a chronic autoimmune neuromuscular disease that affects the voluntary muscles of the body. Myasthenia gravis is caused by a defect in the transmission of nerve impulses to the muscles of the arm. A marker of myasthenia gravis is muscle weakness, worsening during periods of activity and decreasing during periods of rest. To treat the disease, drugs are used that suppress the production of abnormal antibodies, which helps improve impulse transmission and increase muscle strength;

Polymyositis

Polymyositis is quite rare inflammatory disease, which causes muscle weakness and makes it difficult to perform movements such as lifting objects. The direct cause of polymyositis is unknown, but it shares many characteristics with autoimmune diseases in which the immune system mistakenly attacks healthy tissue bodies. Although polymyositis cannot be completely cured, treatments (from medications to physical therapy) can improve the strength and function of the affected muscles;

Parsonage-Turner syndrome

Parsonage-Turner syndrome - enough rare disease, which may be characterized by severe pain in the shoulder and upper arm and the development of severe upper arm weakness. A person suffering from this syndrome develops inflammation of the nerves of the shoulder, arm and hand. Parsonage-Turner syndrome is usually treated effectively with a combination of medications and physical therapy. However, in some cases it may be necessary surgery weakness in the hand;

Monomelic spinal amyotrophy (MA)

MA is characterized by a progressive disease of motor neurons, the nerve cells in the brain and spinal cord responsible for controlling voluntary muscles. MA manifests itself in weakness and atrophy of the muscles of the limb (arm or leg). The cause of monomelic amyotrophy is unknown, although there are medical research, linking MA with radiation exposure or trauma. On this moment, there is no cure for MA, and treatment includes muscle strengthening exercises and hand coordination training.

When should you see a doctor immediately?

If weakness in the arm is combined with the following symptoms, you need to urgently seek medical help:

disturbance of consciousness, loss of consciousness;
slurred or incoherent speech;
high temperature (above 38.5 degrees Celsius);
paralysis or loss of mobility of a certain part of the body;
sudden onset of weakness, numbness, or tingling on one side of the body;
changes in vision, loss of vision;
Strong headache.

Weakness in the arm, if it is not associated with injury or prolonged physical activity, is always a reason to visit a neurologist.

Muscle tissue is necessary for every person to perform a wide variety of movements and actions. Thanks to them, we can move in space, speak and even breathe. But sometimes muscle activity causes various malfunctions that require quite close attention and adequate timely correction. So one of possible violations is muscle weakness in the arms and legs, we’ll talk on this page www.site about the causes of this trouble, consider its symptoms, and also answer the question of how this problem is treated.

Why muscle weakness occurs (reasons)

Weakness in the arms and legs can develop according to various reasons, sometimes they can be completely natural. This condition often occurs in people who play sports, for example, after training. Natural weakness - common symptom viral diseases.

In addition, weakness in the hands can develop due to arthritis, osteochondrosis in cervical spine and spondylosis of the neck. This nuisance often occurs against the background of a sprained or inflammatory lesion of the shoulder. Sometimes it is a consequence of damage to the wrist or shoulder, as well as the area of the shoulder blades. We haven't brought everything pathological conditions which can cause muscle weakness in the arms. This symptom may also be accompanied painful sensations and a feeling of brief numbness.

As for muscle weakness in the legs, it may occur due to sciatica, diabetes mellitus(first or second type). Also, such a disorder is sometimes provoked by nervous stress, fatigue and overexertion. Muscle weakness in the lower extremities can develop due to the presence of hernias in the area lumbar region, mostly intervertebral.

It can also be provoked by osteochondrosis in the lumbar region, as well as hormonal disbalance. This phenomenon may also be caused by natural causes– overwork, wearing tight shoes, etc.

Muscle weakness in the arms and legs can develop due to an autoimmune disorder called myasthenia gravis. This disease usually manifests itself periodically, sometimes exacerbating, sometimes being in remission. With this disease, muscle weakness eventually spreads to other muscles.

How muscle weakness manifests itself (symptoms)

With muscle weakness, a person feels a pronounced decrease in strength either in one muscle or in several at once. It is extremely important to differentiate muscle weakness from a general state of fatigue, feelings of weakness, and lethargy.

Availability chronic fatigue muscles are felt in a certain place, while the general condition of the body remains cheerful.

How muscle weakness is corrected (treatment depending on the causes)

Treatment for muscle weakness depends solely on what caused it. Treatment can only be selected by a doctor who will full diagnostics and determine the cause of the disease.

Myasthenia gravis is considered the most serious problem that can provoke muscle weakness. This disease cannot be cured complete cure, the patient is indicated for physiotherapeutic procedures aimed at recovery muscle tone. Doctors also prescribe medicines, slowing down and stopping pathological processes. Among these medications are Proserin, Kalimin, Oxazil, Metipred, and Prednisolone.

If the cause of muscle weakness lies in pathologies of the nervous system, a neurologist is involved in treatment. The patient is shown physiotherapy, massages and physiotherapeutic treatment. The doctor also selects symptomatic therapy, neuroprotective medications, vitamin formulations etc.

Many disorders that cause weakness of the arms and legs can be successfully corrected with the help of sessions manual therapy. Chiropractic specialists effectively select gentle techniques that help restore optimal blood circulation, eliminate increased swelling, as well as muscle spasms. Carrying out a course of manual therapy in parallel with exercise therapy helps to improve the general condition of blood vessels, eliminate weakness and stop other negative processes.

In the event that muscle weakness is the result of overwork, excessive physical activity etc., the patient needs to completely reconsider his lifestyle. It is extremely important to systematically take full rest and reduce the intensity of stress. In case of such violations, it is necessary to make the diet as balanced and complete as possible, to adhere to drinking regime and take measures to prevent dehydration. If necessary, you should consider changing your shoes to the most comfortable ones. Massages and warm, relaxing baths will be beneficial.

If you are experiencing limb weakness for the first time, it is extremely important to consult a doctor promptly. If unpleasant symptoms appear, you need to relax and have a good rest. You need to sit or lie down for twenty to thirty minutes. This time may be sufficient for temporary optimization of the state. It is also recommended to drink some kind of sedative. A good option would be tea based on mint, lemon balm, etc.

Thus, a feeling of muscle weakness in the arms or legs is serious symptom, which can signal many violations. Therefore, if it occurs, it is necessary to seek doctor’s help.

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Various pathological processes in the body can cause weakness in the hands. Only a specialist can understand the problem after full examination. You cannot diagnose yourself, much less self-medicate, so as not to worsen your condition and face even greater problems.

Possible etiological factors

Sudden weakness in the arms can occur in anyone, even the most healthy person. Despite the fact that such a condition passes as quickly as it arises, it cannot be ignored. Perhaps in this way the body signals the onset of a serious illness. To find out the cause of this syndrome, you need to consult a doctor.

The appearance of unexpected weakness in upper limbs may indicate the presence of neurological disorders, which result in disruptions in muscle activity. Unpleasant symptoms may be a consequence of impaired metabolism or dehydration. This situation occurs when the required drinking regime is not observed or during a strict diet. Malfunctions gastrointestinal tract, kidney or liver problems can also cause weakness and pain in the arms. In addition, discomfort is caused inflammatory processes in the scapular, wrist and shoulder areas.

When the first signs of weakness in the upper limbs appear, it is necessary to analyze whether they are accompanied by additional symptoms: numbness, severe pain, loss of sensitivity. If such deviations are noted, this indicates the development of a number of diseases:

inflammatory process in one of the body systems;
the presence of infection, diabetes, protein deficiency, anemia, hypovitaminosis.

As a result of these diseases, weakness of the arm muscles may develop. To eliminate this syndrome, it is necessary to begin treatment of the underlying disease.

Diseases that cause unpleasant symptoms

Quite often, weakness in the arms is a signal from the body about an impending stroke. As soon as serious blood flow disturbances occur, this symptom is one of the first to appear. Most often one side is affected. Weakness in the left arm causes a right-sided stroke. Pathology of the left hemisphere of the brain provokes weakness in right hand. In many cases, the same symptoms are felt in the lower extremities.

In addition, there is a disturbance in speech and coordination of movements; the patient may complain of headaches and dizziness, darkening of the eyes, vomiting and nausea. At acute stroke it is necessary to quickly transport the patient to the hospital. If treatment is not started in time, the condition can worsen sharply and even lead to death.

Weakness in the left side limbs may also indicate problems with cardiovascular system, disorders of the kidneys and spleen, development vegetative-vascular dystonia, problems with the spine.

Much more often you can hear complaints of discomfort in the right hand. The cause of this may be scoliosis, a curvature of the spine. Incorrect location of the vertebrae leads to pinching of nerve endings and provokes weakness and numbness of the arm.

Among the reasons that cause weakness in the arms, tingling, partial loss of sensation and impaired motor functions, some experts note various damage to the spinal cord that occurs as a result of its compression. For example, loss of strength in the arms due to osteochondrosis is caused by compression of the cervical spinal nerves. The same symptoms are observed with the development of cervical spondylosis. This pathology is characterized by the formation bone growths around the vertebrae.

Unilateral weakness in the arm is observed with radiculopathy, a disease caused by damage to the nerve roots. This pathology also has additional signs. Its development is accompanied by pain in the neck, transmitted to the right or left hand. Quite often there is not only a decrease in strength in the limbs, but also a violation of their sensitivity.

Most often, the development of the disease can be triggered by heavy physical exertion or injury. Its onset is either acute or gradual. At the first signs, you should consult a neurologist or neurologist. Except drug therapy, the doctor will recommend massage, physiotherapy, physical therapy. If necessary, he will carry out a drug blockade.

A gradual increase in weakness in the arms is characteristic of multiple lesions of the peripheral nervous system. Although it is possible acute stage development of the disease. In addition to the main symptom, there are severe pain in the upper and lower extremities, sensitivity is impaired.

Treatment of pathology is based on eliminating the underlying cause and establishing control over general condition patient. In addition to visiting a neurologist and neurologist, you will also need to consult an endocrinologist. If the patient complains of severe pain, he is prescribed complex therapy including painkillers. Physical therapy, physiotherapy and massage will definitely be prescribed.

Weakness in the arms can be caused by myasthenia gravis, a neuromuscular disease characterized by pathological fatigue. The main symptoms of this disease develop after prolonged and heavy physical exertion associated with constant flexion and extension of the hands and arms. The muscles begin to “get tired” and stop obeying. In the most severe cases, paralysis occurs.

Various pathological processes in the body can cause weakness in the hands. Only a specialist can understand the problem after a full examination. You cannot diagnose yourself, much less self-medicate, so as not to worsen your condition and face even greater problems.

Possible etiological factors

Sudden weakness in the arms can occur in anyone, even the healthiest person. Despite the fact that such a condition passes as quickly as it arises, it cannot be ignored. Perhaps in this way the body signals the onset of a serious illness. To find out the cause of this syndrome, you need to consult a doctor.

The appearance of unexpected weakness in the upper extremities may indicate the presence of neurological disorders, which result in disruptions in muscle activity. Unpleasant symptoms may be the result of impaired metabolism or dehydration. This situation occurs when the required drinking regime is not observed or during a strict diet. Problems with the gastrointestinal tract, kidneys or liver can also cause weakness and pain in the arms. In addition, discomfort is caused by inflammatory processes in the scapular, wrist and shoulder areas.

When the first signs of weakness appear in the upper extremities, you need to analyze whether they are accompanied by additional symptoms: numbness, severe pain, loss of sensitivity. If such deviations are noted, this indicates the development of a number of diseases:

inflammatory process in one of the body systems;
the presence of infection, diabetes, protein deficiency, anemia, hypovitaminosis.

As a result of these diseases, weakness of the arm muscles may develop. To eliminate this syndrome, it is necessary to begin treatment of the underlying disease.

Diseases that cause unpleasant symptoms

Quite often, weakness in the arms is a signal from the body about an impending stroke. As soon as serious blood flow disturbances occur, this symptom is one of the first to appear. Most often one side is affected. Weakness in the left arm causes a right-sided stroke. Pathology of the left hemisphere of the brain provokes weakness in the right hand. In many cases, the same symptoms are felt in the lower extremities.

In addition, there is a disturbance in speech and coordination of movements; the patient may complain of headaches and dizziness, darkening of the eyes, vomiting and nausea. In case of acute stroke, it is necessary to quickly transport the patient to the hospital. If treatment is not started in time, the condition can worsen sharply and even lead to death.

Weakness in the limbs of the left side may also indicate problems with the cardiovascular system, disorders of the kidneys and spleen, the development of vegetative-vascular dystonia, and problems with the spine.

Unilateral weakness in the arm is observed with radiculopathy, a disease caused by damage to the nerve roots. This pathology also has additional signs. Its development is accompanied by pain in the neck, transmitted to the right or left arm. Quite often there is not only a decrease in strength in the limbs, but also a violation of their sensitivity.

Most often, the development of the disease can be triggered by heavy physical exertion or injury. Its onset is either acute or gradual. At the first signs, you should consult a neurologist or neurologist. In addition to drug therapy, the doctor will recommend massage, physiotherapy, and physical therapy. If necessary, he will carry out a drug blockade.

A gradual increase in weakness in the arms is characteristic of polyneuropathy - multiple lesions of the peripheral nervous system. Although an acute stage of the disease is also possible. In addition to the main symptom, severe pain is observed in the upper and lower extremities, and sensitivity is impaired.

Treatment of pathology is based on eliminating the underlying cause and establishing control over the general condition of the patient. In addition to visiting a neurologist and neurologist, you will also need to consult an endocrinologist. If the patient complains of severe pain, he is prescribed complex therapy, including painkillers. Physical therapy, physiotherapy and massage will definitely be prescribed.

Weakness in the arms can be caused by myasthenia gravis, a neuromuscular disease characterized by pathologically rapid fatigue. The main symptoms of this disease develop after prolonged and heavy physical exertion associated with constant flexion and extension of the hands and arms. The muscles begin to “get tired” and stop obeying. In the most severe cases, paralysis occurs.