The Four Types of Paralysis, Explained in Plain Language

What Are the Four Types of Paralysis? A Plain-Language Guide

The four main types of paralysis are monoplegia, hemiplegia, paraplegia, and quadriplegia (also called tetraplegia). Doctors name them by how much of the body loses movement — one limb, one side, the lower body, or all four limbs. The names do not tell you what caused the injury.

Maybe a doctor just used one of these words about you or someone you love. If so, you are probably standing in a hospital hallway, trying to make sense of it. This page explains each term the way doctors use it. That way, you can follow the conversation you are having.

Paralysis means a loss of muscle function. It can happen with or without a loss of feeling. It usually comes from damage to the spinal cord, brain, or nerves (Mayo Clinic).

The four types of paralysis, from least to most of the body involved

• Monoplegia — one limb (one arm or one leg)
• Hemiplegia — one side of the body (arm and leg together)
• Paraplegia — the legs and lower body
• Quadriplegia (tetraplegia) — all four limbs and the torso

These words describe the pattern of paralysis. They tell you where on the body it happens. They do not tell you the cause. They also do not tell you how much movement might come back. A truck crash, a fall, a stroke, or violence on an unsafe property can each lead to any of these patterns.

Monoplegia: paralysis of one limb

Monoplegia affects a single limb — usually one arm or one leg. The rest of the body moves normally. It can follow nerve damage, a stroke, a brain injury, or trauma to one area. Some people keep partial movement or feeling in the limb. Others lose it completely.

Hemiplegia: paralysis of one side of the body

Hemiplegia is paralysis of the arm and leg on the same side. That means the right arm and right leg together, or the left arm and left leg. It most often follows a brain injury or stroke that affects one side of the brain.

It differs from monoplegia because it involves two limbs. It differs from paraplegia because it runs down one vertical side, not across the lower half. Hemiplegia often affects walking, balance, and one-handed tasks like dressing.

Paraplegia: paralysis of the lower body

Paraplegia is paralysis of the legs and often the lower trunk. It usually affects the body below the level of the injury. The arms and hands keep working. It is often linked to a spinal cord injury in the mid-to-lower back (the thoracic, lumbar, or sacral regions).

Paraplegia can also affect bladder, bowel, and sexual function. That is because those nerves also travel through the lower spinal cord. Many people with paraplegia use a wheelchair. With the right rehabilitation and equipment, they live full, active lives.

Quadriplegia (tetraplegia): paralysis affecting all four limbs

Quadriplegia and tetraplegia mean the same thing. Both mean paralysis affecting all four limbs and the torso. “Tetraplegia” is the term now preferred in medical and rehabilitation settings.

This pattern usually comes from an injury to the cervical spine — the neck region of the spinal cord. Because the injury is higher up, more of the body is affected. The highest neck injuries can affect the muscles used for breathing. That is why some people need a ventilator to help them breathe.

Here is a key point many pages skip. The higher the spinal cord injury, the more of the body it tends to affect. Mayo Clinic explains that higher, cervical injuries can involve the arms, torso, and legs. Lower injuries may involve only the legs.

An important distinction: “types” vs. “complete vs. incomplete”

Families often get confused here. Some websites mix two different ideas together. Keep them separate:

• The four types (monoplegia, hemiplegia, paraplegia, quadriplegia) describe where paralysis happens — the pattern across the body.
• Complete vs. incomplete describes how much function is lost below the injury. These are not “types,” and they are not “stages.”

Mayo Clinic uses the complete vs. incomplete framework this way:

• Complete — total loss of movement and feeling below the injury.
• Incomplete — some movement or feeling remains below the injured area.

Doctors use a standard exam to find both the level and the completeness of a spinal cord injury. It is called the ISNCSCI (International Standards for Neurological Classification of Spinal Cord Injury). It gives a grade on the ASIA Impairment Scale (American Spinal Injury Association). If you have heard a doctor say “ASIA A” or “ASIA C,” that is this scale. Only your medical team can classify your case.

Questions people often ask about paralysis

What is the most common type of paralysis? Hemiplegia and paraplegia are both common patterns. They are often tied to stroke, brain injury, or spinal cord damage. The Christopher & Dana Reeve Foundation reports that a significant number of Americans live with some form of paralysis. National spinal-cord-injury data is tracked by the National Spinal Cord Injury Statistical Center (NSCISC).

What is the most severe form of paralysis? Quadriplegia (tetraplegia) is generally the most extensive. It affects all four limbs and the torso. It can also involve the muscles needed to breathe.

Which type of paralysis is permanent? There is no simple answer. Complete injuries are more likely to be permanent. But outcomes vary widely by person, injury level, and treatment. Only your doctors can tell you what to expect.

Are the “four types” the same as the “stages” of paralysis? No. The four types describe where paralysis happens on the body. Terms like “stages” or “complete vs. incomplete” describe how much function is lost. They answer different questions. They are not the same list.

Common causes of catastrophic paralysis

Paralysis from an accident usually follows a high-force injury to the spinal cord or brain. Common causes include:

• Truck crashes and other high-speed collisions
• Falls and other trauma that damage the spine or brain
• Violence on an unsafe property, such as an assault or shooting at an apartment complex, parking garage, or business

That last cause surprises many families. Maybe you or a loved one was attacked and seriously hurt on someone else’s property. This could be an apartment complex, a parking lot or garage, a hotel, a bar, a gas station, or a store. If so, the property owner may share responsibility. Owners are generally expected to provide reasonable security. That can mean working locks and gates, good lighting, working cameras, or guards when the setting calls for it.

Sometimes an owner fails to provide that protection. If a foreseeable crime happens because of it, the law calls this negligent security. Most people who need this help have never heard the term. You don’t have to know it to ask whether it applies. Learn more on our negligent security page.

When paralysis results from an accident that wasn’t your fault

Sometimes someone else’s carelessness helped cause the paralysis. If so, your family may have legal options. No honest lawyer can promise a result, and we won’t. But we can review the facts and explain whether another party’s negligence played a role.

Timing matters. Florida has a deadline called a statute of limitations, found at Fla. Stat. §95.11. For many negligence claims, the deadline to file is generally two years from the date of the injury. This applies to claims that started on or after March 24, 2023. Florida also follows a modified comparative-fault rule under Fla. Stat. §768.81. This means how fault is divided can affect a claim. Deadlines and rules vary by state and by the facts. That is why it helps to speak with a lawyer early.

Our Florida Bar–licensed attorneys handle catastrophic paralysis cases across the country. If you’d like someone to review what happened, contact us for a free case evaluation.

Learn more

For more plain-language definitions, visit our injury glossary. You may also want to read about spinal cord injuries and traumatic brain injuries, which often cause paralysis.

This page is educational only. It is not medical or legal advice. For guidance about your health, talk to your doctors. For guidance about your rights, talk to a licensed attorney.