Choreoathetosis is a movement disorder that combines two types of involuntary movements: the quick, dance-like jerks of chorea and the slow, writhing twists of athetosis. This condition appears as a symptom of various underlying diseases and can affect daily activities, from eating and dressing to walking and speaking.
What Is Choreoathetosis?
Choreoathetosis represents the combination of two distinct movement patterns. Chorea describes irregular, unpredictable muscle contractions that move from one body part to another, creating movements that resemble dancing or fidgeting. Athetosis, on the other hand, involves slower, continuous writhing movements that typically affect the hands and feet. When these two patterns occur together, the result is called choreoathetosis, creating movements that are not as slow as pure athetosis but not as quick as pure chorea.[1][3]
The involuntary movements of choreoathetosis are usually random and flow from one area of the body to another. Unlike purposeful movements, people cannot control or suppress these motions. The condition can affect various body parts, including the face, mouth, trunk, arms, and legs. People with choreoathetosis often appear restless or fidgety, and in severe cases, the movements can be continuous and disabling.[3]
Choreoathetosis is not a disease in itself but rather a symptom caused by many different underlying conditions. Understanding this distinction is important because treating choreoathetosis requires addressing whatever is causing the abnormal movements. The movements occur because of problems in a deep brain structure called the basal ganglia, which is responsible for coordinating and smoothing out voluntary movements.[1][3]
Who Gets Choreoathetosis?
Choreoathetosis can affect people of any age or gender. However, certain age groups may be more likely to experience this condition depending on its cause. People between the ages of 15 and 35 years old appear to be most commonly affected by certain forms of choreoathetosis, though both children and older adults can also develop these symptoms.[11]
The specific patterns of who develops choreoathetosis depend heavily on what underlying condition is causing it. For example, certain genetic conditions that cause choreoathetosis may appear in childhood or adolescence, while medication-induced choreoathetosis can occur in adults taking specific drugs. Pregnancy-related chorea typically occurs in women during the first three months of pregnancy and usually disappears shortly after giving birth.[3]
There are no precise statistics on how many people worldwide experience choreoathetosis specifically, partly because it is a symptom rather than a standalone disease. The frequency varies depending on the underlying cause. For instance, one of the most common genetic causes of choreoathetosis is Huntington disease, which affects approximately 4.8 in every 100,000 people globally.[6]
What Causes Choreoathetosis?
Choreoathetosis results from disruptions in the basal ganglia, the brain region that controls movement. In most cases, an excess of a brain chemical called dopamine prevents the basal ganglia from functioning normally. This chemical imbalance leads to the involuntary movements characteristic of choreoathetosis.[3]
Many different diseases and conditions can trigger choreoathetosis. Genetic disorders are among the most common causes. Huntington disease, a hereditary condition that causes progressive brain cell death, is probably the most frequent genetic cause of choreoathetosis. Other genetic conditions include Lesch-Nyhan syndrome, phenylketonuria, and GLUT1 deficiency syndrome. These inherited conditions affect the brain in ways that disrupt normal movement control.[1]
Medications represent another major cause of choreoathetosis. The drug levodopa, commonly used to treat Parkinson disease, can cause involuntary movements as a side effect. Antipsychotic medications can also lead to a form of choreoathetosis called tardive dyskinesia. Other medications that may cause these movements include certain seizure medications like phenytoin and some antidepressants.[1][3]
Substance abuse can also lead to choreoathetosis. The use of crack cocaine or amphetamines can result in movement disorders that are sometimes called “crack dancing” or “tweaking,” which are described as choreoathetoid movements. These drug-related movements occur because these substances affect dopamine levels in the brain.[1]
Various medical conditions can trigger choreoathetosis as well. These include autoimmune disorders like lupus, infections such as rheumatic fever, metabolic problems including thyroid disorders, strokes affecting the basal ganglia, and brain tumors. A condition called kernicterus, which involves brain damage in newborns with severe jaundice, can also cause choreoathetosis. Even pregnancy can sometimes trigger temporary choreoathetosis.[1][3]
Risk Factors for Developing Choreoathetosis
Several factors can increase a person’s risk of developing choreoathetosis. Having a family history of genetic conditions that cause movement disorders, particularly Huntington disease, significantly raises risk. Because Huntington disease is inherited, children of affected parents have a chance of inheriting the faulty gene that causes the condition.[13]
Taking certain medications long-term increases the likelihood of developing medication-induced choreoathetosis. People who take antipsychotic drugs for extended periods face higher risk of tardive dyskinesia. Similarly, individuals with Parkinson disease who take levodopa may develop involuntary movements over time. The longer these medications are taken and the higher the doses, the greater the risk.[1]
Childhood illnesses can set the stage for later movement problems. Children who experience rheumatic fever, certain infections, or head trauma may be at increased risk of developing choreoathetosis later in life. Severe jaundice in newborns that is not promptly treated can lead to kernicterus and subsequent movement disorders.[13]
Having an autoimmune condition like lupus or multiple sclerosis increases the risk of developing choreoathetosis as part of the disease process. Age can also be a factor, as some forms of chorea develop in older adults without any apparent cause. Additionally, pregnant women may experience temporary choreoathetosis, though this usually resolves after delivery.[3][13]
Symptoms and How They Affect Daily Life
The primary symptom of choreoathetosis is involuntary muscle movement that cannot be controlled. These movements can range from mild fidgeting to severe, continuous writhing that interferes with normal activities. The movements typically involve muscle tightness, involuntary twitching, uncontrollable muscle jerks, abnormal body movements, and consistent writhing motions. Unlike voluntary movements, these cannot be stopped by willpower or concentration.[11][18]
People with choreoathetosis may experience what doctors call “milkmaid’s grip.” This means that when trying to hold something or shake hands, the person’s fingers repeatedly squeeze and release, similar to the motion used when milking a cow. This makes it difficult to maintain a steady grip on objects, leading to frequent dropping of items.[13]
Tongue movements are another common feature. The tongue may involuntarily stick out of the mouth repeatedly, sometimes described as a “jack-in-the-box tongue.” This can interfere with speaking clearly and may cause embarrassment in social situations. Speech may become slurred or difficult to understand because of involuntary movements of the mouth and facial muscles.[13]
The involuntary movements can significantly affect posture, walking ability, and everyday activities. Walking may become unstable, with an unsteady, dance-like gait that increases the risk of falls. Swallowing can be affected, making eating and drinking challenging and potentially dangerous due to choking risk. Getting dressed becomes difficult when arms and hands move unpredictably. Even personal hygiene tasks like brushing teeth or washing can be frustrating and time-consuming.[11]
Choreoathetosis episodes can occur randomly or be triggered by certain factors. Stress, anxiety, fatigue, caffeine consumption, and alcohol use can all trigger or worsen episodes. Before an episode begins, some people feel their muscles tightening or experience tingling sensations. Episodes can last anywhere from just 10 seconds to more than an hour. Between episodes, movements may be less severe or absent entirely, depending on the underlying cause.[2][11]
Prevention Strategies
Preventing choreoathetosis primarily means preventing or properly managing the underlying conditions that cause it. Many causes of choreoathetosis, such as genetic conditions like Huntington disease or age-related factors, cannot be prevented. However, there are steps that can reduce risk or severity in some cases.[20]
For medication-related choreoathetosis, prevention involves careful monitoring by healthcare providers. If you take medications known to cause movement disorders, regular check-ups allow doctors to adjust doses or switch medications if early signs of involuntary movements appear. Never stop prescribed medications without medical guidance, but do report any new involuntary movements to your doctor promptly.[1]
Avoiding substance abuse is another important prevention strategy. Not using cocaine, amphetamines, or other drugs that affect brain dopamine levels eliminates this risk factor entirely. If substance abuse is already a problem, seeking treatment can help prevent movement disorders and many other health complications.[1]
For pregnant women with a history of movement disorders or certain autoimmune conditions, working closely with healthcare providers throughout pregnancy can help manage risk. Pregnancy-related chorea typically resolves after delivery, but monitoring ensures any complications are addressed promptly.[3]
Managing underlying health conditions effectively can prevent or minimize choreoathetosis symptoms. Keeping autoimmune diseases under control with appropriate treatment, managing thyroid disorders, controlling blood sugar levels in diabetes, and promptly treating infections all reduce the risk of developing movement disorders as complications. Regular medical care and following treatment plans for chronic conditions represent the best general prevention strategy.[20]
For families with a history of Huntington disease or other genetic conditions, genetic counseling can provide information about risks and options. While this does not prevent the condition in those who inherit the gene, it helps families make informed decisions and plan for the future.[1]
How Choreoathetosis Affects the Body
Understanding what happens inside the body during choreoathetosis helps explain why the symptoms occur. The condition involves disrupted communication in brain circuits that control movement. The basal ganglia, located deep within the brain, normally work with other brain regions to initiate, smooth out, and coordinate voluntary movements. In choreoathetosis, this system malfunctions.[3]
The basal ganglia use chemical messengers called neurotransmitters to communicate. Dopamine is one of the most important neurotransmitters in this system. In most forms of choreoathetosis, too much dopamine activity occurs in the basal ganglia. This excess dopamine prevents the brain from properly controlling and inhibiting movements, leading to the involuntary jerking and writhing motions characteristic of the condition.[3]
The brain normally operates through a balance of signals that promote movement and signals that inhibit movement. Think of it like having both an accelerator and brakes in a car. In choreoathetosis, this balance is disrupted. The “brakes” that normally prevent unwanted movements do not work properly, allowing random movements to escape control. This is why people with choreoathetosis cannot voluntarily stop the movements even when they try.[3]
Different underlying causes damage or disrupt the basal ganglia in different ways. Genetic conditions may cause progressive death of brain cells in these regions. Strokes can damage specific areas directly. Medications and drugs alter neurotransmitter levels chemically. Autoimmune conditions may involve antibodies that attack brain tissue. Metabolic disorders can cause chemical imbalances that affect brain function. Despite these different mechanisms, they all result in similar movement problems because they affect the same brain circuitry.[3]
The severity of symptoms often relates to how extensively the basal ganglia are affected. Mild dysfunction may cause subtle fidgeting or occasional movements, while severe disruption leads to continuous, violent movements that are disabling. In conditions like Huntington disease, symptoms gradually worsen over time as more brain cells die. In contrast, medication-induced choreoathetosis may improve or resolve if the medication is stopped or adjusted.[1]
Interestingly, some people with choreoathetosis develop a lack of awareness about their movements, a phenomenon called anosognosia. This occurs because the same brain regions affected by the movement disorder also contribute to self-awareness and insight. As a result, some individuals do not realize how much they are moving or may not perceive the movements as problematic, even when others around them clearly notice the symptoms.[14]
