Involuntary tongue protrusion in older adults is almost always a sign that something neurological, pharmacological, or structural is going on, not a conscious habit. The causes range from medication side effects to degenerative brain conditions to poorly fitting dentures, and the specific trigger matters because some of these causes are treatable or even reversible. If you have noticed an elderly person repeatedly sticking out or moving their tongue in ways that seem unintentional, the behavior likely falls into one of a handful of well-understood medical categories.
Medications Are One of the Most Common Culprits
Tardive dyskinesia is a movement disorder caused by long-term use of medications that block dopamine receptors in the brain. These include older antipsychotic drugs like haloperidol, but also some medications prescribed for nausea and digestive problems, such as metoclopramide. The tongue and lower face are the areas most often affected: people develop repetitive, involuntary movements like tongue darting, lip smacking, chewing motions, and tongue protrusion that they cannot easily control. Older adults are at the highest risk of developing tardive dyskinesia when exposed to these medications, and the condition can persist even after the drug is stopped.
The reason age matters so much is that the aging brain appears to be more vulnerable to the dopamine-receptor changes these drugs cause. Women and people with mood disorders also face elevated risk, but age is the single strongest predictor. A person who has been on an antipsychotic or a dopamine-blocking anti-nausea drug for months or years and then begins making involuntary tongue movements should be evaluated for tardive dyskinesia promptly, because earlier intervention tends to produce better outcomes.
Tardive dyskinesia is formally assessed using a standardized clinical tool called the Abnormal Involuntary Movement Scale, which rates the severity of involuntary movements in the face, limbs, and trunk.
Dementia and the Return of Infant Reflexes
In healthy infants, tongue protrusion is a normal reflex. Babies automatically push their tongue forward when something touches their lips or the front of their mouth. This reflex disappears between about four and eight months of age as the brain’s cortex matures and gains the ability to suppress it. In adults with advanced dementia, however, these so-called primitive reflexes can resurface. Researchers have documented reflex tongue protrusion as a “release phenomenon,” meaning the cortical damage caused by dementia essentially removes the brain’s ability to keep the reflex suppressed.
This is distinct from the involuntary writhing tongue movements seen in tardive dyskinesia. Reflex tongue protrusion in dementia is typically triggered by touch around the mouth or by the approach of food, and it follows a predictable pattern rather than occurring randomly. For caregivers, it can actually complicate feeding, since the tongue pushes food back out of the mouth rather than helping move it inward. Recognizing this pattern as a neurological sign of cortical deterioration, rather than a behavioral choice, can help families and care staff respond with patience and appropriate feeding strategies.
Parkinson’s Disease and Related Movement Disorders
Parkinson’s disease itself can cause abnormal tongue and mouth movements, and so can the medications used to treat it. Levodopa, the most common Parkinson’s drug, sometimes triggers dyskinesia of the face and tongue as a side effect, particularly after years of use. Anticholinergic medications prescribed alongside levodopa can also produce involuntary oral movements. The result can look similar to tardive dyskinesia, but the clinical context is different: the person already has a known movement disorder, and the tongue movements typically fluctuate in sync with medication doses.
Choreiform movements of the tongue, which are rapid, irregular, and somewhat dance-like, also show up in atypical parkinsonian syndromes. Progressive supranuclear palsy, for example, can produce dystonic features including involuntary contractions of the jaw and tongue muscles. In one review of cases, roughly a quarter of people with progressive supranuclear palsy developed blepharospasm (involuntary eye closure), and a smaller proportion showed oromandibular dystonia involving the tongue.
Meige Syndrome and Other Focal Dystonias
Meige syndrome is a specific type of focal dystonia that begins in adulthood and primarily affects the upper face and jaw. It combines involuntary, forceful eye closure with involuntary contractions of the jaw, tongue, and lower facial muscles. People with Meige syndrome may grimace, clench their jaw, or protrude their tongue involuntarily, and the movements can be severe enough to interfere with speaking and eating.
Because Meige syndrome typically appears in middle age or later, it is primarily a condition of older adults, and it is sometimes mistaken for tardive dyskinesia or even a tic disorder. The key distinction is that Meige syndrome is not caused by medication exposure. It arises from dysfunction in the basal ganglia, a brain region involved in movement control. The dystonic contractions tend to be more sustained and forceful than the quick, repetitive movements of tardive dyskinesia, and they often worsen with stress or fatigue.
Stroke and Focal Brain Lesions
A stroke can damage specific brain areas involved in controlling the tongue and mouth, producing a condition called post-stroke lingual dystonia. In a study of patients who developed involuntary tongue movements after a stroke, the lesions were concentrated in the basal ganglia and surrounding subcortical white matter. Two patients had basal ganglia involvement alone, three had damage to both the basal ganglia and subcortical white matter, one had only subcortical white matter damage, and one had a thalamic hemorrhage.
Post-stroke tongue movements can take several forms: sustained protrusion, rhythmic in-and-out movements, or deviation of the tongue to one side. These movements sometimes begin days to weeks after the stroke itself, which can make the connection less obvious to the patient or family. Unlike some other causes of tongue protrusion, post-stroke dystonia is unilateral in many cases, meaning it may affect one side of the tongue more than the other, reflecting the location of the brain damage.
Poorly Fitting Dentures and Tooth Loss
Not every case of visible tongue protrusion in an older person has a neurological explanation. The tongue plays an active role in stabilizing dentures, and when dentures fit poorly or when a person has lost teeth without adequate replacement, the tongue often compensates by pressing forward or outward. A study of 400 elderly denture wearers found that the tongue’s role in supporting and stabilizing both upper and lower dentures was significant. People with adequate tongue support had better denture retention, better articulation, and better occlusion compared to those whose tongues were not effectively stabilizing the prosthetics.
Over time, the jawbone in edentulous (toothless) areas gradually resorbs, meaning dentures that fit well initially become looser with age. Many older adults unconsciously adapt by using their tongue to hold dentures in place, and this can produce habitual forward tongue posture or visible protrusion. If you notice an elderly family member sticking their tongue out while speaking or eating, and they wear dentures, the simplest explanation may be that their dentures need refitting. This is far more benign than the neurological causes and far easier to address.
Metabolic and Nutritional Causes
Metabolic disturbances can also trigger involuntary orofacial movements. Uremic encephalopathy, which occurs when the kidneys fail to adequately filter toxins from the blood, can present with involuntary tongue and facial movements that mimic tardive dyskinesia. A case report documented orofacial dyskinesia as the presenting feature of uremia in a patient with polycystic kidney disease. The important point for families and clinicians is that these movements are potentially reversible if the underlying kidney dysfunction is treated, though some residual neurological effects may linger.
Nutritional deficiencies, particularly severe vitamin B12 deficiency, can also affect the tongue. While this does not typically cause involuntary protrusion in the classic sense, it produces glossitis, a condition where the tongue becomes swollen, smooth, red, and painful. A person with glossitis may hold their mouth open or protrude their tongue simply because the swelling and pain make it uncomfortable to keep the tongue in its normal resting position. In one documented case, a 68-year-old man presented with a painful, burning tongue and difficulty eating due to glossitis caused by pernicious anemia; his symptoms resolved within two weeks of intramuscular vitamin B12 treatment.
How These Causes Are Told Apart
Because so many different conditions can produce visible tongue movements in elderly people, the diagnostic process involves looking at the whole picture rather than the tongue alone. A physician evaluating involuntary tongue protrusion will typically consider the person’s medication history first, since drug-induced tardive dyskinesia is among the most common causes and can be identified by the timeline of medication use. If the person takes or has recently taken a dopamine-blocking drug, tardive dyskinesia moves to the top of the list.
If medications are ruled out, the evaluation branches into neurological territory. Brain imaging can reveal stroke lesions or structural changes consistent with neurodegenerative disease. Cognitive testing helps determine whether dementia-related reflex re-emergence is plausible. Blood work can identify metabolic causes like uremia or nutritional deficiencies. And a dental examination can clarify whether denture fit or oral structural changes are driving the behavior. The pattern of the tongue movement itself provides clues too: rapid, irregular, and unpredictable movements point toward chorea or tardive dyskinesia, while sustained, forceful contractions suggest dystonia, and reflexive movements triggered by touch suggest a primitive reflex release.
Treatment Depends Entirely on the Cause
For tardive dyskinesia specifically, two relatively new medications called VMAT2 inhibitors (valbenazine and deutetrabenazine) have shown clear benefit in clinical trials. A meta-analysis of randomized controlled trials found that both drugs significantly reduced involuntary movement scores compared to placebo. Valbenazine produced a meaningful response, defined as at least a 50% reduction in movement severity, in roughly three times as many patients as placebo, with about one in four treated patients achieving that threshold. Deutetrabenazine showed a similar pattern, though with a somewhat smaller effect size.
For dystonia-related tongue protrusion, including Meige syndrome, treatment options include botulinum toxin injections into the affected muscles, oral medications that modulate dopamine or acetylcholine signaling, and in refractory cases, deep brain stimulation. For post-stroke lingual dystonia, botulinum toxin is also a mainstay. When the cause is metabolic, treating the underlying condition, such as dialysis for uremia or B12 supplementation for deficiency, can resolve the tongue movements. And when the cause is denture-related, the fix is straightforwardly mechanical: a dental professional refits or replaces the prosthetics.
Dementia-related reflex tongue protrusion is the hardest to treat because it reflects progressive cortical loss that cannot currently be reversed. In these cases, management focuses on adapting feeding techniques and oral care to accommodate the reflex, rather than attempting to eliminate it.
The Social and Emotional Toll
Whatever the underlying cause, visible involuntary tongue movements carry a real social cost. A survey of caregivers in the United States found that over three-quarters reported the involuntary movements sometimes, often, or always affected the patient’s ability to socialize, both in person and remotely. Over half said acquaintances stared at the patient or asked about the abnormal movements. Many patients had difficulty leaving the house because of self-consciousness about how the movements looked to others.
This social withdrawal can compound the isolation that elderly people already face from other factors like mobility limitations and hearing loss. For family members, understanding that the tongue protrusion is involuntary, not a choice or a sign of rudeness, can help reduce frustration and embarrassment on both sides. If you are caring for someone with visible orofacial movements, gently educating friends and extended family about the medical nature of the condition tends to reduce the awkwardness significantly.
When Tongue Protrusion Is Actually a Swallowing Exercise
There is one context where elderly people deliberately stick their tongue out, and it is entirely intentional: swallowing rehabilitation. Tongue-hold swallowing exercises, in which a person protrudes their tongue and holds it between their teeth while swallowing, are used by speech-language pathologists to strengthen the muscles involved in safe swallowing. Research has shown that the degree of tongue protrusion matters. Suprahyoid muscle activation, which is the target of the exercise, increases significantly as the tongue is protruded further.
If you see an elderly person in a clinical or home-care setting repeatedly protruding their tongue and then swallowing, they may simply be doing prescribed exercises for dysphagia, a condition where swallowing becomes difficult or unsafe. Dysphagia is common in older adults, particularly after stroke or in neurodegenerative disease, and these exercises are a standard part of rehabilitation. For individuals who cannot protrude even a small amount of tongue, alternative exercises are typically recommended instead.