
Paralysis is a loss of muscle function in one or more muscles, which can be temporary or permanent. It is caused by damage to the nervous system, particularly the spinal cord, and can be the result of a stroke, trauma with nerve injury, cerebral palsy, multiple sclerosis, or Guillain-Barré syndrome. Paralysis can also be caused by severe head or neck injuries, genetic differences, or certain medical conditions. It can affect any part of the body and cause problems with blood flow, breathing, organ function, speech, and more. Treatment for paralysis includes physiotherapy, occupational therapy, and medication.
| Characteristics | Values |
|---|---|
| Type | Partial/Paresis, Complete, Localized, Generalized |
| Nature | Stiff/Spastic, Floppy/Flaccid |
| Cause | Traumatic injury, Medical condition, Stroke, Spinal cord injury, Cerebral palsy, Multiple sclerosis, Bell's palsy, Birth defects like spina bifida, Autoimmune diseases, Brain injuries, Transient ischaemic attack, Muscular dystrophy, Sleep paralysis, Hypokalemic/Hyperkalemic periodic paralysis, Genetic differences, Andersen-Tawil syndrome, Thyrotoxic PP, Hereditary spastic paraplegia, Amyotrophic lateral sclerosis, Parkinson's disease, Botulism, Poliomyelitis, Peripheral neuropathy, Spina bifida, Guillain-Barré syndrome, Fibrocartilaginous embolism, Nerve injury, Gunshot wounds, Sports injuries, Assaults, Motor vehicle accidents, Industrial accidents, Slip and fall accidents, Poisonous snake bites, Drugs that interfere with nerve function, Extreme mental stress, Congenital syphilis, Panic anxiety disorder, Chondrodysplastic breeds of dogs |
| Symptoms | Loss of feeling and muscle control, Muscle cramps, Numbness in limbs, Difficulty breathing, Coughing, Pneumonia, Blood clots, Deep vein thrombosis, Speech or swallowing problems, Depression, Anxiety, Sexual issues, High blood pressure, Low blood pressure, Heart problems, Urinary incontinence, Loss of bowel control, Pressure injuries, Sepsis, Muscle weakness, Muscle stiffness, Involuntary muscle spasms, Involuntary tremors, Hallucinations |
| Treatment | Physical therapy, Occupational therapy, Speech therapy, Adaptive equipment, Medicines |
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What You'll Learn

Strokes and spinal cord injuries
Strokes
Strokes happen when something cuts off the blood supply to the brain. There are three types of strokes that can result in paralysis: transient ischemic attack (TIA) or "mini-stroke", ischemic stroke, and hemorrhagic stroke. A TIA is a warning sign that a full-blown stroke may occur in the future. An ischemic stroke occurs when a blood clot blocks the blood flow to the brain. A hemorrhagic stroke occurs when a blood vessel bursts or ruptures inside the brain. Hemorrhagic strokes are further divided into three types: aneurysm, arteriovenous malformation, and bleeding in the brain.
Strokes can cause paralysis on one side of the face and body, known as hemiplegia, or on both sides, known as diplegia. They can also cause other symptoms such as trouble speaking, blurry or double vision, confusion, dizziness, headaches, loss of coordination, memory loss, mood swings, nausea, neck stiffness, seizures, slurred speech, and a sudden worsening of the senses.
Spinal Cord Injuries
Spinal cord injuries affect the spinal cord, which links the brain to major nerves throughout the body. They commonly cause severe symptoms like paralysis. An injury to the spinal cord can interrupt nerve signal traffic, resulting in a loss of muscle control, feeling, or function below the injury site. The severity of the injury depends on the location and extent of the damage. An incomplete injury means that some nerve communication is still possible below the injury site, while a complete injury results in no nerve communication and permanent loss of all abilities below the injury.
Spinal cord injuries can cause different types of paralysis depending on the location of the injury. Paraplegia, for example, is caused by an injury lower down the spinal cord and affects the lower body and legs. Tetraplegia, on the other hand, involves the paralysis of all four limbs and sometimes certain organs.
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Traumatic injuries
Paralysis occurs when nerve signals can't reach the muscles, resulting in the loss of voluntary muscle movement. It can be partial or complete, temporary or permanent, and can affect any part of the body. Strokes, spinal cord injuries, and cerebral palsy are among the most common causes of paralysis. However, traumatic injuries, such as those sustained in accidents, falls, or sports, can also lead to paralysis. Here are some ways in which traumatic injuries can cause muscle paralysis:
Traumatic Brain Injuries
Brain injuries, including traumatic brain injuries (TBIs), can lead to paralysis. The brain controls muscle movement through nerve signals sent via the nervous system. When the brain is damaged, these signals may be interrupted, resulting in paralysis. Traumatic brain injuries can occur due to various incidents, such as car accidents, sports injuries, gunshot wounds, or falls. The severity of paralysis caused by brain injuries can vary, and specialized therapies, such as passive range-of-motion exercises and neuroplasticity activation, are designed to help restore muscle movement and control.
Spinal Cord Injuries
Damage to the spinal cord can cause paralysis by disrupting the nerve signals that control muscle movement. Spinal cord injuries can be caused by traumatic events such as car accidents, sports injuries, or falls. The impact of these injuries can lead to different types of paralysis, including paraplegia, affecting both legs, and quadriplegia, affecting all four limbs.
Broken Bones
Broken bones can also lead to paralysis by causing nerve injuries. For example, a broken bone in the neck could damage the spinal cord, resulting in paralysis. The severity of paralysis caused by broken bones will depend on the location and extent of the injury.
Gunshot Wounds
Gunshot wounds are another form of traumatic injury that can cause paralysis. The impact of a bullet can damage the spinal cord, brain, or nerves, leading to paralysis. The extent of paralysis will depend on the location and severity of the wound.
It is important to note that the effects of traumatic injuries on muscle paralysis can vary depending on the location and severity of the injury, as well as the individual's specific circumstances. In some cases, rehabilitation services, physical therapy, and assistive devices can help improve function and independence for those experiencing paralysis due to traumatic injuries.
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Autoimmune diseases
Paralysis is the loss of voluntary muscle function in one or more body parts. It is caused by damage to the nervous system, specifically the nerve cells or neurons. Autoimmune diseases are one of the causes of paralysis.
Myositis is an autoimmune disease that involves chronic inflammation, leading to muscle weakness over time. The inflammation is caused by the immune system losing tolerance to the muscle, causing it to attack the muscle with immune cells and other inflammatory mediators. Myositis usually affects the muscles used for movement, such as those in the arms, shoulders, legs, hips, abdomen, and spine. There are a few different forms of myositis, including polymyositis, dermatomyositis, and inclusion body myositis. Polymyositis affects multiple muscles simultaneously and typically develops gradually in adults, with females being twice as likely to develop it than males. Dermatomyositis affects the skin in addition to the muscles and can develop quickly or slowly. Myositis has no known cure, but treatments such as corticosteroids, immunosuppressants, and immunoglobulin can help manage symptoms and induce remission.
Guillain-Barré syndrome (GBS) is another autoimmune disease that affects the peripheral nervous system. GBS occurs when the body's immune system mistakenly attacks the nerve covering (myelin sheath), leading to nerve inflammation and muscle weakness or paralysis. GBS can affect people of any age but is most common in those over 50 years old. While there is no cure for GBS, treatments such as apheresis, plasmapheresis, and intravenous immunoglobulin can help reduce symptoms and speed up recovery.
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Brain injuries
Paralysis is the temporary or permanent loss of voluntary muscle movement in one or more parts of the body. It occurs when nerve signals from the brain to the muscles are interrupted due to damage to the nerves, spinal cord, or brain. Brain injuries can cause paralysis, and the type of paralysis experienced depends on the location of the injury in the brain.
The brain is divided into two hemispheres, each of which controls distinct movements and functions, typically on the opposite side of the body. For example, an injury to the left portion of the brain may result in paralysis of the limbs and body parts on the right side of the body. Traumatic brain injuries (TBIs) can lead to either complete or partial paralysis. In cases of partial paralysis, individuals may retain control over certain body parts while losing control over others, such as being able to move their arms but not their legs.
There are various treatments available for individuals who have suffered paralysis due to brain injuries. These treatments aim to help the body regain muscle function and movement. Some common treatment options include:
- Mirror therapy: This is often used for patients with paralysis affecting their legs, arms, or hands. It involves placing a mirror over the paralyzed body part.
- Passive range-of-motion exercises: These exercises involve a therapist stretching and moving the patient's paralyzed limbs.
- Electrical stimulation: This treatment sends electrical impulses directly to the affected muscles, causing them to contract and stimulating the brain.
- Mental exercises: Patients visualize performing various movements, activating neuroplasticity and encouraging the formation of new neural pathways.
- Active exercise: Once minimal movement has been regained, active exercises can be introduced to further improve muscle function.
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Genetic disorders
Paralysis occurs when an individual loses the ability to make voluntary muscle movements. This happens when the nerve signals that are sent to the muscles are interrupted, usually due to damage to the nervous system. Strokes and spinal cord injuries are the most common causes of paralysis. Paralysis can be temporary or permanent and can affect a small or large area of the body.
There are many genetic disorders that can cause paralysis. Muscular dystrophy (MD) is a group of more than 30 genetic diseases that cause progressive weakness and degeneration of the skeletal muscles that control movement. MD can lead to mobility impairment or even paralysis. There are many forms of MD, some noticeable at birth, known as congenital MD, while other forms develop in adolescence. The three most common types of MD differ in terms of pattern of inheritance, age of onset, rate of progression, and distribution of weakness. Congenital MD may also affect the central nervous system, causing vision and speech problems, seizures, and structural changes in the brain.
Duchenne MD primarily affects boys and is the result of mutations in the gene that regulates dystrophin, a protein involved in maintaining the integrity of muscle fiber. Onset is between 3-5 years and progresses rapidly. Most boys become unable to walk at 12, and by age 20 they have to use a respirator to breathe.
Other genetic disorders that can cause paralysis include inflammatory myopathy, progressive muscle weakness, and cardiomyopathy (heart muscle weakness that interferes with pumping ability). These disorders may produce symptoms similar to MD but are caused by different genetic defects.
Periodic paralysis is another group of inherited neurological disorders that can cause seemingly random attacks of paralysis. The attacks can be triggered by low or high potassium levels in the blood, exercise, stress, colds, high-carbohydrate meals, fasting, certain medications, or high thyroid hormone levels.
Sleep paralysis is another type of paralysis that occurs while an individual is waking up or falling asleep. Sometimes, people who experience sleep paralysis will also hallucinate.
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