Spasticity After Spinal Cord Injury: Symptoms, Triggers and Treatment

Spasticity is common after a spinal cord injury, but it does not affect everyone in the same way. It may feel like persistent stiffness, sudden leg or arm spasms, repeated ankle movements, or muscles that straighten or bend without warning. For some people, a small amount of muscle activity helps with standing, transfers or circulation. For others, it causes pain, interrupts sleep, makes personal care difficult or creates a safety risk. The useful question is not simply “How much tone is present?” but “What is it doing to this person’s comfort, function and daily life?”

Last updated: September 17, 2026. This page is based on current rehabilitation evidence and established spinal cord injury resources. It has not been medically reviewed and does not replace an individual assessment.

What does spasticity mean after spinal cord injury?

A spinal cord injury changes how messages travel between the brain, spinal cord and muscles. Below the level of injury, the nervous system may become more responsive to movement, touch or irritation. Muscles may contract involuntarily and reflexes can become exaggerated. This broader pattern can include increased resistance to fast passive movement, spasms, clonus and sustained muscle activity. You can read a fuller explanation in What Is Spasticity?

Spasticity usually appears after the early period of spinal shock, when reflex activity may initially be reduced. Its timing, severity and pattern depend on the level and completeness of the injury, recovery over time and the person’s health. An incomplete injury can produce very different movement problems from a complete injury, and even people with similar neurological levels may have different experiences.

Spasticity is only one possible cause of a stiff or difficult-to-move limb. Joint restriction, contracture, pain, swelling, fracture, heterotopic ossification and changes in posture can also limit movement. A careful assessment matters because increasing antispastic treatment will not correct every one of these problems.

Common symptoms and movement patterns

People may use the word “spasticity” for several related sensations and movements. Describing exactly what happens helps the rehabilitation team understand the pattern. Common experiences include:

• Muscle stiffness: a limb feels difficult to bend or straighten, especially when moved quickly.
• Extensor spasms: the hip and knee straighten, the legs may draw together, and the feet may point downward. This can occur during a transfer, when changing position or when the bladder is full.
• Flexor spasms: the hip or knee suddenly bends toward the body.
• Clonus: rhythmic, repeated contractions, often noticed as the ankle rapidly beats after a position change or foot placement.
• Trunk or abdominal spasms: the body may stiffen or curl, sometimes affecting balance, breathing comfort or seating.
• Upper-limb patterns: after a higher cervical injury, the shoulder, elbow, wrist or fingers may pull into a repeated posture.

Spasms can be brief or sustained. They may occur many times a day or only in particular situations. They can also change with fatigue, temperature, stress, infection, time of day and positioning. A clinic examination is therefore only one snapshot. A simple diary or short video, recorded safely and with consent, can help show what happens at home.

Can spasticity ever be useful?

Yes. Some people use extensor tone to help bear weight, stand, pivot or complete a transfer. Muscle activity may help maintain bulk or alert a person to a hidden problem below an area of reduced sensation. A familiar increase in spasms, for example, may be the first sign of a full bladder or skin irritation.

This does not mean that troublesome spasticity should be ignored. It means treatment should be linked to a specific problem. Spasticity becomes more likely to need treatment when it causes pain, repeated falls, poor wheelchair positioning, skin damage, difficulty with hygiene or dressing, interrupted sleep, loss of range, unsafe transfers or reduced participation in work, family life and rehabilitation.

Before reducing tone, the team should ask what the person currently relies on. A treatment that makes the legs feel looser could also make a transfer harder if useful extensor activity is lost. Our guide to setting spasticity treatment goals explains how to balance comfort, care, safety and function.

Why do spasms suddenly become worse?

After spinal cord injury, stimuli below the level of injury may trigger a strong reflex response even when pain is not felt in the usual way. A sudden increase should prompt a search for a cause rather than an automatic increase in medication. Common triggers include:

• a full bladder, blocked or kinked catheter, bladder stone or urinary tract infection;
• constipation, stool impaction, gas or a change in the bowel routine;
• pressure injury, rash, chafing, ingrown toenail, burn, insect bite or another skin problem;
• tight clothing, a shoe, strap, brace or wheelchair component pressing on the body;
• poor posture, a change in seating, an uncomfortable sleeping position or a difficult transfer;
• fracture, joint injury, inflammation, heterotopic ossification or another source of pain;
• infection, fever, fatigue, emotional stress or exposure to temperature extremes;
• a new medication, missed dose or abrupt change to an antispastic medicine.

Start with the person’s usual trigger checklist. Check the bladder system, bowel routine, skin, clothing, equipment and position. Do not repeatedly force a limb through a strong spasm. If the cause is unclear, the change is dramatic, or there are other new symptoms, contact the clinical team promptly. Read more in Why Does Spasticity Suddenly Get Worse?

Spasticity that first appears long after the injury, or a substantial unexplained change in an established pattern, may need a broader neurological and musculoskeletal evaluation. The clinician may consider problems such as a syrinx, tethering, fracture or other new pathology depending on the history and examination.

How is spasticity after spinal cord injury assessed?

Assessment begins with the person’s priorities. The clinician should ask when spasms occur, which body areas are involved, whether they are painful, what triggers them and how they affect sleep, transfers, wheelchair use, walking, hygiene, dressing, sexual activity, bowel and bladder care, and participation. Family members or caregivers may add useful observations, but the person’s own goals remain central.

The physical examination may include passive movement at different speeds, joint range, clonus, muscle strength, selective control, sensation, skin, posture and seating. The Modified Ashworth Scale describes resistance during passive movement, but it cannot by itself show how much a person is bothered or helped by spasticity. SCI-specific tools, spasm-frequency measures and functional measures can add information. See How Is Spasticity Measured? and Symptoms and Diagnosis.

The team also looks for fixed contracture. A limb that cannot reach the expected position even when moved slowly may have structural shortening or another joint problem in addition to neural overactivity. This distinction influences whether medication, injection, stretching, orthotic management or surgical assessment is likely to help.

A useful baseline is practical: number of spasms during a transfer, nights disturbed per week, minutes needed for dressing, amount of assistance required, distance walked or time tolerated in a chair. The outcome measure should match the goal.

Treatment options

Treat the trigger first

When spasticity suddenly worsens, resolving a bladder, bowel, skin, positioning or pain problem may return it to baseline without changing long-term medication. Trigger management is not an optional extra. It is often the first and most important part of treatment.

Rehabilitation, positioning and movement

Physical and occupational therapy can help maintain range, improve positioning, practise transfers and daily tasks, and identify equipment changes. A programme may include gentle range-of-motion work, active movement, task-specific practice, supported weight bearing, strengthening, seating review and caregiver training. The plan should reflect bone health, skin risk, autonomic function and the person’s injury level. More is not always better, and forceful stretching can cause injury. See Rehabilitation for Spasticity and Stretching and Exercise for Spasticity.

Splints, braces or serial casting may help selected people maintain position or range, but fit must be checked carefully when sensation is reduced. Pressure, swelling and skin redness are reasons to stop and seek review. Learn more about splints and orthoses.

Oral medicines

Medicines such as baclofen or tizanidine may be considered when spasticity is widespread or frequent. The choice and dose depend on the target symptoms, kidney and liver health, other medicines and possible effects on alertness, blood pressure and strength. Treatment is usually introduced and adjusted gradually. Baclofen should not be stopped suddenly because withdrawal can be dangerous. See our overview of oral medications for spasticity.

Focal treatment

When a limited group of muscles interferes with a specific goal, botulinum toxin injections or another focal treatment may be considered. Examples include an adductor pattern that complicates hygiene, a clenched hand that affects skin care, or a foot position that makes bracing difficult. Treatment should be paired with a plan for positioning, practice or therapy and reviewed against the agreed goal. Read about botulinum toxin for spasticity.

Intrathecal baclofen

For severe, widespread spasticity that has not responded adequately to less invasive treatment, a specialist team may assess intrathecal baclofen. A surgically implanted pump delivers medicine into the fluid around the spinal cord. A screening trial, clear functional goals and the ability to attend regular refill and monitoring visits are essential. Pump malfunction, overdose or withdrawal can be serious, so the person and caregivers need an emergency plan. Learn more about intrathecal baclofen pumps.

Surgery

Surgery is reserved for selected situations. Orthopaedic procedures may address fixed deformity or positioning problems. Neurosurgical procedures that alter nerve pathways are less commonly used and may be irreversible. Decisions require specialist assessment, realistic goals and careful discussion of what function or sensation could be lost.

A practical day-to-day plan

• Learn the usual pattern: which movements, times and situations bring on spasms.
• Keep bladder and bowel routines consistent and know how to check for common problems.
• Inspect skin every day, using a mirror or assistance for areas that are hard to see.
• Check wheelchair cushions, straps, footwear and orthoses for pressure or poor fit.
• Change position as advised and avoid remaining in a posture that reliably provokes painful spasms.
• Follow an individualized movement and range programme rather than copying an aggressive routine online.
• Track meaningful outcomes, such as sleep, transfer safety, care time and pain, not only the number of spasms.
• Take medicines exactly as prescribed and do not stop baclofen or alter pump care without specialist advice.

A short written action plan can reduce uncertainty. It may list common triggers, what to check first, whom to contact, pump or catheter information, current medicines and warning signs that require urgent care. Review the plan when equipment, medication, bladder management or daily support changes.

Urgent warning signs and autonomic dysreflexia

Seek urgent assessment for new weakness or loss of function, breathing difficulty, severe unexplained pain, a suspected fracture, a hot swollen limb, major skin breakdown, fever with illness, or severe spasms that do not settle. A person with reduced sensation may not feel an injury in the usual way, so visible changes and sudden increases in spasticity deserve attention.

Frequently asked questions

Does spasticity mean the spinal cord injury is getting worse?

Not usually. Spasticity can fluctuate without a change in the spinal cord injury itself. A sudden increase more often signals a trigger such as bladder, bowel, skin, pain or positioning problems. An unexplained, persistent or late new pattern still needs clinical evaluation.

Should all spasms be eliminated?

No. Treatment is appropriate when the disadvantages outweigh any useful effects. Some people rely on tone for transfers or standing. The goal may be fewer painful or disruptive spasms rather than no muscle activity at all.

Can stretching cure spasticity after spinal cord injury?

Stretching does not repair the injured nervous system or permanently remove spasticity. An individualized programme can help maintain range, support positioning and temporarily reduce tightness. It is usually one part of a broader plan.

Why are spasms worse when the bladder is full?

Signals from a distended bladder can trigger exaggerated reflex activity below the injury. A blocked catheter, urinary infection or stone can have a similar effect. A repeated bladder-related pattern should be discussed with the team responsible for bladder care.

Who should assess troublesome spasticity?

Assessment is often multidisciplinary. A rehabilitation physician, spinal cord injury specialist, neurologist, physical therapist, occupational therapist, nurse, orthotist and urology or pain professionals may contribute, depending on the problem. The right team is the one that can connect the examination to the person’s goals and underlying triggers.

Continue reading

• Spasticity Treatment
• Rehabilitation for Spasticity
• Sudden Worsening: Triggers and Warning Signs
• Living with Spasticity