Multiple sclerosis damages the protective coating around nerve fibers in the brain and spinal cord, and the feet are often among the first places people notice something is wrong. Symptoms range from tingling and numbness to weakness that makes the front of the foot drag during walking, along with painful muscle tightening that can reshape the foot over time. What makes foot problems in MS especially tricky is that several of these issues overlap and feed into each other, so a person rarely deals with just one symptom in isolation.
Why the Feet Are So Vulnerable
The nerves that serve your feet travel some of the longest pathways in the body. Signals running from the brain down through the spinal cord and out to the muscles and sensory receptors of the toes have to cover a lot of distance, and any interruption along the way shows up most at the endpoints. A systematic review of lower-extremity health in MS found that patients commonly experienced walking difficulties, balance problems, muscle weakness, spasticity, and, in the feet specifically, high arches, claw toes, swelling, and altered sensation.1PubMed Central. Research on lower extremity health in patients with multiple sclerosis: a systematic scoping review Those problems can appear early in the disease course or develop gradually over years, and they tend to worsen during relapses or as disability accumulates.
Sensory Symptoms You Might Notice First
Tingling, pins-and-needles, and numbness in the feet are among the earliest complaints people with MS report. These sensations, collectively called paresthesia, happen when demyelinated nerves misfire or fail to carry signals cleanly. Some people describe a feeling like wearing a thick sock even when barefoot, or a buzzing under the skin of the sole. Others experience outright pain, sometimes a burning or stabbing quality classified as neuropathic pain. A systematic review found that pain and paresthesia are among the most common presenting symptoms in MS and have a significant impact on quality of life.2PubMed Central. A Case Report of Cryoneurolysis for Dorsal Foot Pain and Toe Clawing in a Patient With Multiple Sclerosis
What makes sensory loss in the feet particularly consequential is the effect on proprioception, your unconscious sense of where your body parts are in space. When the nerves carrying position information from the feet are damaged, your brain gets unreliable data about the ground beneath you. This is one driver of the unsteady gait many people with MS develop. Clinicians test for this by checking vibration sense and position sense at the great toe. In people whose proprioception is impaired, balance typically worsens with the eyes closed because the brain can no longer compensate visually for the missing sensory input.3IntechOpen. Ataxia in Multiple Sclerosis: From Current Understanding to Therapy
One unsettling finding is that measurable sensory deficits in the feet can be present well before anyone notices. A study using quantitative vibration testing found that roughly 30% of MS patients whose clinical exam scored their sensation as “normal” actually had abnormal vibration thresholds when measured with precise instruments.4PubMed Central. Quantitative measures detect sensory and motor impairments in multiple sclerosis That means a person can have real sensory damage in the feet that neither they nor their neurologist recognizes during a routine office visit.
Foot Drop and Other Motor Problems
Foot drop is one of the most recognizable foot-related problems in MS. It happens when the muscles responsible for lifting the front of the foot during walking become too weak or poorly coordinated to do their job. Instead of clearing the ground normally, the foot drags or slaps down with each step, which forces people to hike their hip or swing the leg outward to compensate. The same quantitative study that caught hidden sensory deficits also found that about 32% of patients rated as having no motor impairment on standard clinical scales actually had measurable ankle weakness, making dorsiflexion weakness an early deficit that is often overlooked.4PubMed Central. Quantitative measures detect sensory and motor impairments in multiple sclerosis
Beyond weakness, spasticity adds another layer of trouble. Spasticity is an involuntary tightening or stiffness in the muscles, and in the feet it can pull the toes into a clawed position or force the arch into an abnormally high shape known as pes cavus. A survey of people with MS found pes cavus and claw toes in a subset of patients, mediated in part by spasms of the tibialis anterior muscle on the front of the shin.5PubMed. Pes cavus and claw toes deformity in patients with spinal cord injury and multiple sclerosis These deformities are not just cosmetic. Claw toes press against the inside of shoes, creating pressure sores. A high arch shifts weight onto areas of the foot that are not designed for it, leading to calluses, metatarsal pain, and instability. When you combine those structural changes with the reduced sensation described earlier, a blister or sore can go unnoticed for days.
How Walking Mechanics Change
Even before foot drop becomes obvious, MS alters the way the ankle moves during each stride. A systematic review of gait studies found that people with MS consistently show reduced dorsiflexion during the stance phase of walking and reduced push-off power at the end of each step. For context, healthy controls in these studies showed ankle positions around neutral or slightly dorsiflexed at key moments of the gait cycle, while MS participants showed angles several degrees more plantarflexed.6PubMed Central. Gait Pattern in People with Multiple Sclerosis: A Systematic Review The practical result is a shorter stride, slower walking speed, and a heavier, less efficient way of moving that burns more energy over the same distance.
These gait changes matter beyond the feet themselves. When the ankle does not move through its normal range, the knee and hip compensate, often leading to pain in those joints over time. Falls also become much more likely. Many people with MS limit their walking to avoid the effort and the risk, which in turn leads to deconditioning and further weakness, creating a cycle that is hard to break without intervention.
Temperature, Sweating, and Circulation
MS can also affect the autonomic nerves that control blood vessel diameter and sweat production in the feet. Lesions in the brain areas that regulate body temperature can impair the normal sweating response, which sometimes manifests as one foot sweating less than the other or both feet feeling abnormally cold or warm.7PubMed Central. Thermoregulation in multiple sclerosis Reduced sweating contributes to dry, cracked skin on the feet, and impaired circulation can slow healing. People with MS who notice that their feet stay cold even in warm environments or that the skin on their feet seems unusually dry should mention it to their care team, because these symptoms have a neurological basis rather than being a simple circulation issue.
The temperature sensitivity that many people with MS experience throughout their bodies also plays out in the feet. Heat can temporarily worsen nerve conduction problems, so a hot bath or a long walk on a warm day can amplify numbness, tingling, or weakness in the feet until the body cools down. This phenomenon, sometimes called Uhthoff’s effect, is not causing new damage but is making existing demyelination temporarily more apparent.
Nail and Skin Issues
People with MS appear to be somewhat more susceptible to fungal nail infections. A study in a Mexican population found onychomycosis in 32% of people with MS compared to 26% of healthy controls, though the difference was not statistically significant.8PubMed Central. Onychomycosis in patients with multiple sclerosis: prevalence, clinical description, mycological, and dermoscopic study in a Mexican population The slightly higher rate likely reflects several converging factors: reduced mobility making foot care harder, immunosuppressive medications that some MS patients take, decreased sensation that delays detection of early infection, and altered sweating patterns that change the foot’s moisture environment. While the clinical appearance of fungal nails in MS patients is similar to that in the general population, the practical challenge is that reduced sensation means the infection can progress further before anyone notices thickened or discolored nails.
Beyond fungal infections, the combination of spasticity-driven foot deformities and impaired sensation creates a setup for pressure injuries. Claw toes rub against the top of the shoe box, high arches concentrate force on the ball of the foot and heel, and the person may not feel the early warning signs of redness or irritation. Regular foot checks, either self-performed or with a partner’s help, are worth building into a routine, especially for people who have significant sensory loss.
Braces, Electrical Stimulation, and Other Devices
The two main external aids for foot drop in MS are ankle-foot orthoses (AFOs) and functional electrical stimulation (FES) devices. An AFO is a lightweight brace, usually made of plastic or carbon fiber, that fits inside the shoe and holds the foot at a better angle during walking. FES works differently: small electrical pulses stimulate the peroneal nerve near the knee at the right moment during the gait cycle, causing the foot to lift. Clinicians prescribe both to help with foot drop, though a systematic review noted that the existing research is too variable to say definitively which one is better across different levels of disability, types of MS, or walking environments.9PubMed. A systematic literature review of ankle-foot orthosis and functional electrical stimulation foot-drop treatments for persons with multiple sclerosis
A meta-analysis of orthotic effects for foot drop (including but not limited to MS) found that AFOs and FES had equally positive effects on key walking measures, which pushes back against the assumption that FES is automatically the superior choice.10PubMed. Functional electrical stimulation versus ankle foot orthoses for foot-drop: A meta-analysis of orthotic effects In practice, the choice often comes down to personal factors. AFOs are simpler, cheaper, and require no batteries or electrodes. FES devices feel more natural to some users because they activate the person’s own muscles, and a study of an implanted FES system in 23 people with MS found that both walking speed and walking distance increased significantly and the gains were maintained at three years of follow-up.11Europe PMC. Correction of Footdrop Due to Multiple Sclerosis Using the STIMuSTEP Implanted Dropped Foot Stimulator Some people try both and settle on the one that works better for their lifestyle, or they use an AFO for long outings and FES for shorter walks around the house.
Managing Spasticity in the Feet
When spasticity is the main problem rather than weakness, the approach shifts. Oral medications like baclofen and tizanidine reduce muscle tone throughout the body but can cause drowsiness and overall weakness, which is a trade-off that does not appeal to everyone. For localized spasticity in the foot and ankle, botulinum toxin injections (Botox) offer a more targeted solution. Evidence-based guidelines recommend botulinum toxin for treating spasticity caused by MS, and injections into specific muscles of the lower leg can relax claw toes or reduce the pull that creates a high arch.12Canadian Journal of Health Technologies. Onabotulinum Toxin A (Botox) for Spasticity Associated With Multiple Sclerosis The effect typically lasts three to four months before another round is needed.
Stretching, particularly sustained stretching of the calf muscles and toe flexors, remains a cornerstone of spasticity management that requires no prescription. Standing on an incline board, gently pulling the toes back, or using a towel looped around the ball of the foot to stretch the ankle are simple interventions that many physical therapists prescribe as daily routines. The goal is not to reverse the underlying nerve damage but to keep muscles and tendons from shortening to the point where they permanently lock the foot into a deformed position.
Exercise and Non-Drug Approaches to Pain and Tingling
For the sensory symptoms, specifically neuropathic pain and persistent tingling, a systematic review and network meta-analysis found that several non-drug interventions outperformed control treatments. Aquatic exercise, yoga, and mindfulness-based stress reduction were among the approaches that showed meaningful benefit for paresthesia.2PubMed Central. A Case Report of Cryoneurolysis for Dorsal Foot Pain and Toe Clawing in a Patient With Multiple Sclerosis Aquatic exercise in particular offers a two-for-one benefit: the water supports body weight, reducing the impact on painful feet, while the resistance of moving through water strengthens the muscles that walking on land has become too difficult to exercise.
For severe, focal foot pain that does not respond to other treatments, cryoneurolysis is a newer option. This procedure uses extreme cold applied to a specific nerve to block pain signals. In one documented case, a person with MS who had debilitating pain on the top of the foot along with toe clawing reported that the neuropathic pain was fully eliminated immediately after the procedure.2PubMed Central. A Case Report of Cryoneurolysis for Dorsal Foot Pain and Toe Clawing in a Patient With Multiple Sclerosis That is a single case report and not something to generalize from, but it illustrates that interventional pain techniques originally developed for other conditions are beginning to be applied to MS-related foot pain.
Shoes, Insoles, and Everyday Foot Care
Footwear choices matter more when MS is affecting the feet than most people realize. A shoe with a rigid sole can act as a mild stabilizer for a foot with some degree of drop, making each step more predictable. Shoes with a wide toe box reduce pressure on claw toes. Rocker-bottom soles can compensate for lost push-off power at the ankle by helping roll the foot forward through the gait cycle. Custom orthotics molded to the foot can redistribute pressure away from areas that have become overloaded by a high arch or altered gait, though over-the-counter arch supports work adequately for milder cases.
Beyond choosing the right shoe, a few habits make a meaningful difference. Inspecting the feet regularly for cuts, blisters, or redness is especially important when sensation is reduced. Keeping the skin moisturized prevents cracking, particularly if autonomic changes have reduced sweating. Trimming toenails carefully and watching for early signs of fungal infection avoids problems that are harder to treat once they advance. None of these measures are glamorous, but for someone whose feet cannot reliably report pain, a few minutes of inspection each evening can catch issues that would otherwise go unnoticed until they become serious.
When Foot Symptoms Appear Before a Diagnosis
It is worth noting that foot symptoms sometimes lead to an MS diagnosis rather than the other way around. A person might visit a podiatrist for unexplained numbness in the toes, or an orthopedic specialist for a foot that keeps tripping them up, and the workup eventually points toward a neurological cause. The finding that quantitative testing reveals ankle weakness and sensory loss in people whose standard exams look normal underscores how subtle the earliest foot involvement can be.4PubMed Central. Quantitative measures detect sensory and motor impairments in multiple sclerosis If you have unexplained tingling, numbness, or weakness in one or both feet that comes and goes, and especially if it worsens with heat, those are patterns worth raising with a neurologist rather than attributing to a pinched nerve or poor circulation without investigation.
Foot problems also serve as a practical barometer for how the disease is behaving overall. A sudden worsening of foot drop or a new patch of numbness on the sole can signal a relapse. A gradual decline in walking endurance or increasing stiffness in the toes over months may reflect progression. Paying attention to the feet gives both the person with MS and their medical team useful early signals about disease activity that might not be as noticeable in other parts of the body.