Choreoathetosis is a movement disorder in which two distinct types of involuntary movement occur together: chorea, which produces quick, unpredictable, dance-like jerks, and athetosis, which produces slow, continuous, writhing motions. The combination can affect the limbs, trunk, face, or all three at once, and it arises from damage or dysfunction in deep brain structures called the basal ganglia. While many people encounter the term for the first time in the context of cerebral palsy or Huntington disease, choreoathetosis actually has a surprisingly long list of causes, from high blood sugar to certain medications to autoimmune brain inflammation.
How Chorea and Athetosis Overlap
Chorea and athetosis were originally described as separate conditions. Chorea refers to an ongoing, random-appearing sequence of discrete involuntary movements or movement fragments, while athetosis refers to a slow, continuous, involuntary writhing movement that prevents a person from holding a stable posture.1Europe PMC. Definition and classification of hyperkinetic movements in childhood In practice, pure chorea and pure athetosis rarely appear in isolation. Most people with one also show features of the other, which is why clinicians coined the blended term “choreoathetosis.” You might see quick, jerky flicks of the fingers that flow seamlessly into a slower twisting of the wrist and forearm, all within a few seconds. The movements are involuntary but not rhythmic the way a tremor is, and they typically worsen with stress, fatigue, or attempted voluntary movement.
Historically, neurologists debated whether athetosis was truly its own entity or just part of a spectrum running from chorea to dystonia. That debate stretched from the late 1800s well into the twentieth century, with European neurologists initially dismissing the concept altogether.2PubMed Central. Early Controversies over Athetosis: I. Clinical Features, Differentiation from other Movement Disorders, Associated Conditions, and Pathology Modern movement-disorder specialists generally treat chorea, athetosis, and dystonia as overlapping phenomena that share basal ganglia circuitry, and they acknowledge that drawing sharp borders between them at the bedside is often impossible.
The Basal Ganglia Connection
Nearly every cause of choreoathetosis traces back to the basal ganglia, a cluster of interconnected structures deep in the brain that help filter and refine voluntary movement. When these structures or their connections to the cortex and thalamus are damaged, the normal gating of motor signals breaks down. Movements that should be suppressed leak through, producing the characteristic involuntary jerks and writhing. In cerebral palsy, for example, the condition can be subdivided by which brain area is injured: spastic forms involve damage to cortical motor areas, ataxic forms involve the cerebellum, and choreoathetotic forms are specifically associated with damage to the basal ganglia.3Wiley Online Library. Pathophysiology of the corticospinal system and basal ganglia in cerebral palsy
Brain imaging studies support this localization. In children and adults with dyskinetic cerebral palsy, higher levels of choreoathetosis correlate with lesions that are confined to the thalamus and basal ganglia, as opposed to lesions that also spread into surrounding white matter.4PubMed. Clinical patterns of dystonia and choreoathetosis in participants with dyskinetic cerebral palsy Dystonia, by contrast, does not show the same tight link to pure basal ganglia lesions. This distinction matters because it influences treatment planning: therapies that target basal ganglia circuits, such as deep brain stimulation, can be more precisely directed when imaging confirms the lesion’s location.
Causes in Children
The most common reason a child develops choreoathetosis is cerebral palsy, specifically the dyskinetic subtype. Two perinatal events dominate the list of causes. In one study of children with dyskinetic cerebral palsy, severe jaundice from high bilirubin was responsible in about two-thirds of cases, while oxygen deprivation around birth accounted for roughly a third.5PubMed. Hyperbilirubinemia and Asphyxia in Children With Dyskinetic Cerebral Palsy In both scenarios, the basal ganglia are selectively vulnerable: bilirubin is toxic to these nuclei at high concentrations, and the same structures are among the first to suffer when the neonatal brain is starved of oxygen.
Rarer genetic conditions can also produce choreoathetosis in childhood. Lesch-Nyhan syndrome, caused by a deficiency of a purine-recycling enzyme, leads to severe action dystonia, choreoathetosis, ballismus, and the self-injurious behavior the condition is known for. Children with Lesch-Nyhan syndrome appear normal at birth, with the movement disorder emerging as psychomotor development falls behind.6PubMed Central. Hypoxanthine-guanine phosophoribosyltransferase (HPRT) deficiency: Lesch-Nyhan syndrome Another genetic category involves paroxysmal dyskinesias, episodes of involuntary movement that come and go rather than persisting all the time. Paroxysmal kinesigenic dyskinesia, for instance, is mainly caused by mutations in the PRRT2 or TMEM151A genes and may involve abnormal ion channels, abnormal synaptic signaling, or both.7PubMed Central. Paroxysmal Kinesigenic Dyskinesia: Genetics and Pathophysiological Mechanisms These episodes often respond well to low doses of anti-seizure medications, which distinguishes them from the persistent choreoathetosis of cerebral palsy.
Causes in Adults
In adults, the cause list shifts. Huntington disease is probably the best-known example. Chorea is the signature motor feature early on, and as the disease progresses over years, voluntary movement abnormalities, dystonia, and athetosis layer in and increasingly interfere with daily activities.8JAMA Neurology. Progression of Symptoms in the Early and Middle Stages of Huntington Disease The mixture of chorea and athetosis in advanced Huntington disease is a textbook example of choreoathetosis, though it is far from the only adult cause.
Stroke can also produce dramatic, one-sided choreiform movements. Hemichorea-hemiballismus, in which involuntary flinging or jerking affects one side of the body, is classically linked to damage in the subthalamic nucleus on the opposite side of the brain. More recent reports, though, have shown that strokes in the striatum, thalamus, cortex, and even subcortical white matter can produce the same presentation.9Cureus via Europe PMC. When Stroke Mimics a Subthalamic Lesion: An Unusual Presentation of Hemichorea-Hemiballismus This expanded map of potential lesion sites means that post-stroke chorea is not always recognized immediately, since the infarct may not sit where clinicians traditionally expect.
Autoimmune brain inflammation is an increasingly recognized trigger. Anti-NMDA receptor encephalitis, an autoimmune condition in which the immune system attacks a specific brain receptor, can produce a range of movement disorders including chorea, athetosis, dystonia, and stereotypic movements. In a study of children with this condition, every patient had at least one movement disorder, and most had several at once.10Wiley Online Library / Movement Disorders. The spectrum of movement disorders in children with anti-NMDA receptor encephalitis Unlike many structural causes of choreoathetosis, autoimmune-driven cases can improve substantially once the underlying immune attack is treated.
Metabolic Triggers
One of the more surprising causes of choreoathetosis is dangerously high blood sugar without the ketone production that usually accompanies diabetic emergencies. This condition, called non-ketotic hyperglycemia, can cause sudden-onset one-sided chorea that resolves completely once blood glucose returns to normal.11JAMA Internal Medicine. Nonketotic Hyperglycemia Appearing as Choreoathetosis or Ballism In a meta-analysis pooling data from over 50 reported cases, the overwhelming majority of patients developed hemichorea, meaning the movements affected only one side of the body.12PubMed. Chorea associated with non-ketotic hyperglycemia and hyperintensity basal ganglia lesion on T1-weighted brain MRI study: a meta-analysis of 53 cases including four present cases Brain MRI in these patients typically shows a bright signal in the basal ganglia on certain imaging sequences, a finding that can initially be mistaken for a stroke or tumor.
The practical takeaway is that anyone who suddenly develops involuntary movements on one side of the body should have their blood sugar checked. It is one of the most treatable causes of choreoathetosis: correct the hyperglycemia and the movements usually stop. This makes it a crucial diagnosis not to miss, particularly in older adults with poorly controlled diabetes who may present to an emergency department with what looks like a stroke.
Drug-Induced Choreoathetosis
Several medications can provoke choreoathetosis as a side effect. The most common culprit in movement-disorder clinics is levodopa, the mainstay treatment for Parkinson disease. Levodopa-induced dyskinesia is a well-known complication that can appear even within weeks or months of starting the drug. The dyskinesias encompass a variety of involuntary movements, with chorea and dystonia being the most frequent.13PubMed. Drug-Induced Dyskinesia, Part 1: Treatment of Levodopa-Induced Dyskinesia The movements tend to peak when levodopa blood levels are highest and fade as each dose wears off, though more erratic patterns develop with longer use. Research suggests that improvements in how levodopa is delivered to the brain may reduce the prevalence of this problem over time.14PubMed. Levodopa-induced dyskinesia in Parkinson disease: Current and evolving concepts
Less well known is phenytoin, an older anti-seizure medication. Case reports have documented choreoathetosis developing in epilepsy patients even at standard therapeutic blood levels of phenytoin. In one set of cases involving children with severe myoclonic epilepsy, choreoathetosis appeared days to months after a dose increase and resolved when the dose was lowered.15PubMed. Phenytoin-induced choreoathetosis in patients with severe myoclonic epilepsy in infancy A separate report confirmed the link by provoking the movements with a single oral test dose: sustained dystonia and choreoathetosis appeared within two hours.16PubMed. Phenytoin-induced dystonia and choreoathetosis in two retarded epileptic children Because the effect can occur at drug levels considered “normal,” clinicians cannot rely on blood tests alone to rule it out. The clinical picture, specifically the timing of movement onset relative to dose changes, is the key clue.
Treatment With Medications
There is no single drug that treats all forms of choreoathetosis, because the best medication depends on the underlying cause. For Huntington disease chorea, the most thoroughly studied option is deutetrabenazine, a drug that reduces dopamine signaling by blocking a protein involved in packaging dopamine into nerve-cell vesicles. In a randomized trial, deutetrabenazine reduced chorea severity scores by about two and a half points more than placebo, a difference that was clinically meaningful in terms of how noticeable the movements were.17JAMA. Effect of Deutetrabenazine on Chorea Among Patients With Huntington Disease: A Randomized Clinical Trial Follow-up in an open-label extension study showed the benefit held up for years, and the drug is now FDA-approved for this use.18CNS Spectrums. Long-Term Efficacy and Safety of Deutetrabenazine for Chorea in Huntington’s Disease: Results From the ARC-HD Open-label Study Deutetrabenazine has also shown efficacy for tardive dyskinesia, another form of drug-induced involuntary movement.19PubMed Central. Clinical Utility of Deutetrabenazine as a Treatment Option for Chorea Associated with Huntington’s Disease and Tardive Dyskinesia
For other causes, treatment targets the underlying condition. Choreoathetosis from non-ketotic hyperglycemia resolves with blood sugar correction. Drug-induced cases resolve with dose reduction or medication changes. Autoimmune-driven choreoathetosis responds to immunotherapy. And in paroxysmal dyskinesias caused by PRRT2 mutations, low-dose carbamazepine is often remarkably effective. The common thread is that identifying the cause matters more than reaching for a specific anti-chorea drug.
Deep Brain Stimulation
When choreoathetosis is severe and does not respond adequately to medications, deep brain stimulation (DBS) is sometimes considered. The procedure involves implanting electrodes into specific brain targets, most often the internal segment of the globus pallidus (GPi), and delivering continuous electrical pulses that modulate the dysfunctional circuits. For patients with dystonia-choreoathetosis from cerebral palsy, the GPi remains the preferred stimulation target.20PubMed. Deep brain stimulation for dystonia-choreoathetosis in cerebral palsy: Pallidal versus thalamic stimulation
The results, though, are more modest for choreoathetosis than for some other movement disorders. In a study following patients with generalized dystonia or choreoathetosis for two years after DBS, those with choreoathetosis showed an average improvement of about 23 to 29 percent on a standardized scale at one year, but the improvement was not statistically significant. Interestingly, two of these patients reported feeling markedly better even though objective scores were less impressive.21Journal of Neurosurgery. Chronic stimulation of the globus pallidus internus for treatment of non-DYT1 generalized dystonia and choreoathetosis: 2-year follow up That gap between subjective and objective outcomes is worth noting: for someone whose daily life is dominated by involuntary movements, even a partial reduction can feel transformative even if it does not show up dramatically on a clinical rating scale.
A separate prospective study of bilateral pallidal stimulation in cerebral palsy patients with dystonia-choreoathetosis found more encouraging results when the electrode placement hit the right spot. The mean dystonia rating score improved by roughly a quarter at one year, with significant gains in function, pain reduction, and mental-health quality of life. However, when the stimulation current drifted into adjacent structures, the benefit dropped off.22The Lancet Neurology. Bilateral pallidal stimulation in cerebral palsy with dystonia-choreoathetosis: a prospective pilot study Precise electrode placement is therefore critical, and not every patient is a good candidate.
Rehabilitation and Everyday Function
Beyond medications and surgery, physical and occupational therapy play a central role in managing choreoathetosis, particularly in children. The involuntary movements themselves cannot be “exercised away,” but therapy can improve the stability and functional ability that the movements undermine. A case report of a child with sudden-onset choreoathetosis documented significant gains in gross motor function, selective limb control, and independence in daily mobility tasks following a program that included stabilization exercises, aquatic therapy, and functional training.23Pediatric Physical Therapy. Physical Therapy for a Child With Sudden-Onset Choreoathetosis: A Case Report The child went from needing assistance with basic mobility to performing those tasks independently.
Adaptive equipment can also make a meaningful difference. Weighted utensils, arm supports, and specialized seating systems help compensate for the instability that choreoathetosis creates. For children in school, adaptive keyboards and eye-tracking devices can open up communication and learning when hand control is unreliable. The goal of rehabilitation is not to eliminate the movements but to build the person’s ability to function despite them.
Effects on Speech and Swallowing
Choreoathetosis does not stay confined to the arms and legs. When it involves the muscles of the face, tongue, palate, and throat, it causes a form of speech impairment called hyperkinetic dysarthria. Speech becomes unpredictable in loudness, rhythm, and clarity, because the same involuntary movements that jerk a hand can also interrupt a breath or distort a vowel mid-word. The involuntary movements characteristic of hyperkinetic dysarthria significantly affect communication, swallowing, and quality of life.24PubMed Central. Speech–Language Pathology Evaluation and Management of Hyperkinetic Disorders Affecting Speech and Swallowing Function
Swallowing difficulties deserve particular attention because they can lead to aspiration, where food or liquid enters the airway instead of the esophagus. Speech-language pathologists work with patients on compensatory strategies, such as altering food textures, adjusting head positioning during meals, and practicing exercises that strengthen the muscles involved in swallowing. For some people, the speech effects of choreoathetosis are more disabling than the limb movements, because the inability to communicate clearly affects relationships, education, and employment in ways that are hard to quantify on a movement-disorder rating scale.
Chorea During Pregnancy
A historically notable variant is chorea gravidarum, involuntary movements that appear during pregnancy. This was far more common in the era before antibiotics, when rheumatic fever was widespread. Rheumatic fever can cause Sydenham chorea by triggering an immune attack on the basal ganglia, and the hormonal changes of pregnancy can reactivate that vulnerability years later. Case reports from regions where rheumatic fever remains common still document pregnant women presenting with choreiform or choreoathetoid movements of the upper limbs and jerky speech, sometimes triggered by emotional stress.25Europe PMC. Chorea gravidarum: a rarity in West still haunts pregnant women in the East In higher-income countries, where rheumatic fever has become rare, chorea gravidarum has largely disappeared. But in South Asia, sub-Saharan Africa, and parts of the Pacific, it remains a clinical reality. Treatment focuses on managing the movements safely during pregnancy while addressing any residual rheumatic heart disease, since the same immune process that damages basal ganglia can damage heart valves.