Neurological Disorders That Cause Falling

Dozens of neurological conditions raise the risk of falling, but a handful stand out as especially dangerous. A large case-controlled study found that 46% of patients with neurological disorders fell at least once per year, compared with only 16% of matched controls, and the rates climbed steeply for specific diagnoses: 89% for stroke, 77% for Parkinson’s disease, and 60% for dementia.¹ The reasons vary from one condition to another, but they all trace back to the same basic problem: the brain’s system for keeping you upright is extraordinarily complex, and damage at almost any point in the chain can send someone to the ground.

How the Brain Keeps You on Your Feet

Standing upright is inherently unstable. Your body’s center of mass sits high above a narrow base of support, and gravity is constantly trying to topple you. To stay balanced, your brain continuously blends information from three sensory channels: vision, the vestibular organs in your inner ear, and proprioceptors in your muscles and joints that report limb position. It then generates corrective torque through your muscles, adjusting stiffness and timing on the fly.² When conditions change, the brain dynamically reweights which sensory inputs it trusts most, shifting reliance from vision to vestibular feedback, for example, when you close your eyes.³

This process runs through multiple brain regions. Brainstem pathways handle the automatic, rhythmic component of walking, while the cerebellum fine-tunes coordination, and cortical association areas handle the more cognitive aspects of navigating unfamiliar environments.⁴ A neurological disorder does not have to knock out the entire system. Damage to any single node in this network can degrade balance enough to cause falls.

Parkinson’s Disease and Progressive Supranuclear Palsy

Parkinson’s disease is probably the condition most closely associated with neurological falls, and for good reason. Roughly 39% of people with Parkinson’s experience falls, and an even larger fraction report near-falls or instability.⁵ The disease attacks dopamine-producing neurons in the basal ganglia, which disrupts the automatic motor programs that keep gait smooth and posture upright. People develop a stooped posture, shortened stride, and a characteristic shuffling walk that is hard to stop or redirect once in motion.

A particularly dangerous feature is “freezing of gait,” in which the feet seem to stick to the floor mid-step, often at doorways or when turning. Up to 63% of people with idiopathic Parkinson’s disease experience freezing episodes, and the rate climbs as the disease progresses.⁶ The upper body keeps moving while the feet stay planted, and momentum tips the person forward.

Progressive supranuclear palsy, a rarer neurodegenerative disease sometimes mistaken for Parkinson’s, is even more devastating for falls. In one cohort, 58% of patients fell within the first year of diagnosis, and by roughly four years after disease onset, 83% reported falls. Eventually, every patient in the study experienced them. The median was 20 falls in the previous 12 months, making PSP one of the most fall-prone conditions in all of neurology.⁷ PSP tends to cause backward falls early in the disease, which is unusual and often a clue for diagnosis.

Stroke

Stroke is the neurological event most people think of first, and its connection to falling is direct. Damage to the motor cortex or the pathways running from the brain down to the spinal cord often leaves one side of the body weak or paralyzed. A common consequence is foot drop, in which the ankle cannot lift properly during the swing phase of walking. This affects roughly 20% to 30% of stroke survivors, forcing an awkward, high-stepping gait to clear the toes and creating obvious trip hazards.⁸

Fall rates among stroke survivors in rehabilitation hospitals range from 27% to 39%.⁵ Beyond pure motor weakness, stroke can impair spatial awareness on the affected side, leaving patients unaware of obstacles. It can also damage the cerebellum or brainstem balance centers directly. The original case-controlled study mentioned above found that stroke patients had the highest percentage of fallers of any neurological subgroup, at 89%.¹

Multiple Sclerosis

Multiple sclerosis damages the insulating myelin sheath around nerve fibers in the brain and spinal cord, and because lesions accumulate in different locations over time, the symptoms are unpredictable and wide-ranging. Weakness, spasticity, fatigue, impaired coordination, altered sensation, and vision changes can all appear in the same person, often in combination.⁹ That makes falls almost inevitable: an estimated 40% to 60% of people with MS experience recurrent falls.⁵

What makes MS particularly tricky is that fall risk fluctuates. A person may walk well in the morning and become unsteady later in the day as fatigue sets in, or experience sudden worsening during a relapse. Spasticity in the legs can make them stiff and unpredictable, while sensory loss in the feet reduces the proprioceptive feedback the brain relies on for balance. Many people with MS describe the sensation as walking on cotton or not being sure where their feet are without looking down.

Dementia and Cognitive Impairment

Falls in dementia are often attributed to physical frailty, but the cognitive component is surprisingly powerful on its own. Walking is not the purely automatic act it feels like; it requires ongoing executive function, including attention, judgment, and the ability to process two things at once. Older adults with Alzheimer’s disease are more than twice as likely to fall as their cognitively healthy peers, with fall rates estimated at 60% to 80%.⁵ About 40% to 60% of elderly falls lead to injuries, and despite this, most fall-risk assessments still fail to account for mental status.¹⁰

Research on older adults without obvious balance problems found that executive function predicted fall risk independently. Those with better executive function scores had fewer falls, even after adjusting for age, sex, and health status. Among people who already had balance impairment, the relationship was not statistically significant, suggesting that once physical balance is clearly compromised, the cognitive contribution gets overshadowed.¹¹ The practical implication is that a person with early-stage dementia and a perfectly normal neurological exam may still be at elevated fall risk purely because their brain can no longer handle the attentional demands of navigating a cluttered living room while thinking about something else.

Cerebellar Ataxia and Peripheral Neuropathy

The cerebellum acts as the brain’s coordination center, smoothing out movements and managing timing. Damage from cerebellar degeneration, alcohol toxicity, certain medications, or inherited conditions produces ataxia: a wide-based, lurching gait with erratic step-to-step variation in both timing and sideways placement.¹² People with cerebellar ataxia look unsteady in a way that is often mistaken for drunkenness, and the unpredictability of each step makes falls hard to anticipate or prevent.

On the sensory side, peripheral neuropathy can produce a similar pattern through a different mechanism. When the nerves carrying proprioceptive information from the feet and legs are damaged, typically in conditions like diabetic neuropathy, the brain loses accurate information about where the limbs are in space. The resulting “sensory ataxia” worsens dramatically in low-light conditions or on uneven surfaces, when vision alone cannot compensate.¹³ Neuropathies and peripheral nerve lesions were specifically identified as predisposing to recurrent falls in the large case-controlled study, not just occasional ones.¹

Vestibular Disorders

Damage to the vestibular system in the inner ear or its connections to the brainstem disrupts the sense of motion and spatial orientation. Bilateral vestibulopathy, in which both inner ears are affected, produces chronic unsteadiness that worsens in the dark or on soft surfaces. People with bilateral vestibular loss also show deficits in spatial navigation, making significantly more errors when trying to find novel routes through real-world environments, while performing normally on familiar, previously learned paths.¹⁴ They also walked longer, more deviant paths during combined walking-and-perception tasks, suggesting the vestibular system is tightly linked to the brain’s ability to process spatial information during movement.¹⁵

This matters practically because vestibular disorders do not always announce themselves with dramatic spinning vertigo. Chronic bilateral loss can present as vague unsteadiness, especially in older adults, and may go undiagnosed for years. When someone falls repeatedly in dimly lit hallways or on uneven outdoor terrain but seems fine in a well-lit clinic exam room, vestibular dysfunction should be on the list of suspects.

Normal Pressure Hydrocephalus

Normal pressure hydrocephalus is worth knowing about because it is one of the few causes of neurological falls that can be treated, even reversed. In this condition, cerebrospinal fluid accumulates in the brain’s ventricles, gradually compressing surrounding tissue. The hallmark is a distinctive “magnetic” gait in which the feet appear glued to the floor, accompanied by short, shuffling steps and difficulty turning.¹⁶ The gait disturbance is typically the first and most prominent symptom, often appearing before the cognitive decline and urinary incontinence that complete the classic triad.

What makes NPH so important to identify is that draining the excess fluid, either temporarily through a lumbar puncture or permanently with a surgically implanted shunt, can produce dramatic improvement. In one reported case, removing 50 milliliters of cerebrospinal fluid through a lumbar puncture resulted in an 18-hour improvement in walking, and a subsequent shunt led to gradual improvement over the following year.¹⁶ The tragedy of NPH is that it is often mistaken for “just getting old” or misdiagnosed as Parkinson’s or Alzheimer’s, meaning some people live with a treatable cause of their falls for years without knowing it.

Epileptic Drop Attacks

Some falls are not the result of chronic instability but of sudden, paroxysmal events. Epileptic drop attacks are seizures that cause an abrupt loss of postural tone or a brief, violent muscle contraction, sending the person straight to the ground without warning. The mechanism involves a localized seizure focus that spreads rapidly across both hemispheres of the brain, producing a brief but complete disruption of the motor system.¹⁷ Because there is no time to brace, injuries from drop attacks tend to be severe, and the unpredictability can be profoundly disabling.

Drop attacks are more common in certain epilepsy syndromes and in people with partial epilepsy that secondarily generalizes. They can also occur in non-epileptic conditions, but when they are seizure-related, they typically respond to seizure medications or, in refractory cases, devices like vagus nerve stimulators or surgical intervention.

Neurogenic Orthostatic Hypotension

Not every neurological fall involves a gait problem. In neurogenic orthostatic hypotension, the autonomic nervous system fails to constrict blood vessels when a person stands up, causing blood pressure to plummet. The brain is briefly starved of blood flow, producing lightheadedness, visual dimming, and sometimes a full loss of consciousness. The result can look like a “simple faint,” but the underlying cause is neurological damage to the baroreflex pathways.¹⁸

This condition is common in the same neurodegenerative diseases that cause other types of falls, particularly Parkinson’s disease, multiple system atrophy, and Lewy body dementia. The goal of treatment is not to normalize blood pressure across the board but to reduce the drops severe enough to cause lightheadedness, syncope, and falls.¹⁹ Simple strategies like rising slowly, wearing compression stockings, and staying well hydrated can help, alongside medications that boost blood pressure on standing.

When Medications Make Things Worse

Many of the drugs prescribed for neurological conditions act on the central nervous system in ways that independently raise fall risk. Sedatives, antiepileptics, antidepressants, and antipsychotics can cause drowsiness, slow reaction times, and impair coordination. In older adults with dementia, current use of any CNS-active medication was associated with roughly a 60% increase in the risk of fall-related injury compared to non-use.²⁰ The risk appeared to come from using any CNS-active medication at all rather than from taking higher doses, and there was a trend toward greater risk when multiple classes of these drugs were combined.

This creates a difficult clinical balancing act. A person with epilepsy needs antiseizure medication to prevent drop attacks, but the medication itself may make them unsteady. Someone with Parkinson’s needs dopaminergic drugs to walk, but those same drugs can cause orthostatic hypotension. Reducing fall risk often means working with a physician to find the lowest effective doses and to eliminate any medications that are no longer clearly necessary.

Neuromuscular Conditions

Conditions affecting the motor neurons, nerves, or muscles themselves can weaken the legs enough to cause falls, even when the brain’s balance centers are intact. Amyotrophic lateral sclerosis, for instance, progressively destroys motor neurons, and researchers have found that fall incidence correlates with lower extremity strength: weaker legs mean more falls.²¹ Other neuromuscular diseases like myasthenia gravis, muscular dystrophies, and inflammatory myopathies produce similar patterns of proximal or distal weakness that undermine the physical ability to recover from a stumble.

Dual-Task Training and Rehabilitation

Because so many neurological conditions contribute to falling through different mechanisms, rehabilitation approaches have to be tailored. One strategy with growing evidence behind it targets the cognitive-motor interference problem directly. In stroke survivors, a dual-task exercise program, which combines physical exercises with simultaneous cognitive challenges like counting or word games, reduced the risk of falls by 25% and injurious falls by about 22% over a six-month follow-up compared with standard exercise alone.²² The idea is to train the brain to handle walking and thinking at the same time, which is exactly the real-world scenario where falls tend to happen.

Wearable sensors are also increasingly being used to monitor gait and predict who is most likely to fall, though the field is still relatively young. A systematic review found that most research so far has focused on Parkinson’s disease and multiple sclerosis, with fewer studies in stroke or Alzheimer’s disease.⁵ The appeal is obvious: a sensor worn during daily life captures information about gait quality, step variability, and turning speed that a clinic visit, with its smooth floors and focused attention, may miss entirely.

Functional Gait Disorders

Sometimes the falls are real, the distress is real, and the gait looks abnormal, but no structural neurological damage can be found. Functional gait disorders produce walking patterns that are inconsistent with known neurological disease, showing features that change depending on the type of examination being performed or that do not fit any recognized pattern of brain or nerve damage.²³ These are not “faked” or imagined. They represent a genuine malfunction in how the nervous system generates movement, but the problem lies in the software rather than the hardware, if you will.

Functional gait disorders are worth mentioning because they are more common than many clinicians realize, and misdiagnosis in either direction is harmful. Labeling a functional gait disorder as Parkinson’s disease leads to unnecessary medication. Labeling a real neurological condition as “just anxiety” delays treatment. The diagnostic key is identifying specific clinical signs of inconsistency and incongruity, features that would not make anatomical sense if they were caused by structural damage. Treatment typically involves specialized physical therapy that retrains normal movement patterns, along with psychological support, and outcomes can be quite good when the diagnosis is made early and explained clearly to the patient.

1
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