Sydenhams Dance Causes Symptoms and Does It Go Away On Its Own

Sydenham chorea, also known medically as St. Vitus' Dance, is a neurological disorder that causes rapid, sudden, and involuntary movements that may appear like uncontrolled “dancing.” The condition most commonly affects children and adolescents after a throat or tonsil infection caused by certain bacteria. In these cases, the immune system mistakenly attacks parts of the brain responsible for controlling movement.Although the symptoms can be distressing and concerning for both patients and their families, the reassuring news is that the condition is usually temporary and often improves with proper treatment and follow-up care. However, several important questions remain: What causes Sydenham chorea? How can its symptoms be recognized early? And can it disappear on its own without treatment?In this article by Dalili Medical, we will explore everything you need to know about Sydenham chorea in a clear and straightforward way, helping you understand the condition accurately without unnecessary fear or exaggeration.

What is Sydenham’s Chorea?

Sydenham’s chorea is a rare neurological disorder that primarily affects children and adolescents. It is characterized by rapid, irregular, and involuntary movements involving the face, hands, and feet, which may resemble unintentional “dancing” movements.

The condition typically develops as a result of an autoimmune reaction following an infection caused by Group A Streptococcus bacteria—the same bacteria responsible for strep throat and rheumatic fever.

Treatment usually includes antibiotics, medications to control involuntary movements, adequate rest, and regular medical follow-up.

Is Sydenham’s Chorea a Serious Disease?

In most cases, Sydenham’s chorea is not considered a serious condition. It is usually temporary and responds well to treatment.

However, the main concern arises when it is associated with rheumatic fever, which can affect the heart, particularly the heart valves.

Is Sydenham’s Chorea Contagious?

No, Sydenham’s chorea itself is not contagious.

However, the streptococcal throat infection that may trigger the condition can be contagious before antibiotic treatment is started.

Can Sydenham’s Chorea Go Away on Its Own?

Yes. In some cases, symptoms may gradually improve over weeks or months even without direct treatment.

Nevertheless, medical treatment can accelerate recovery, reduce symptom severity, and help prevent complications.

Can the Condition Recur?

Yes, recurrence is possible, particularly if:

Streptococcal throat infections occur repeatedly.
Preventive treatment prescribed by a physician is not followed.

Regular medical follow-up significantly reduces the risk of recurrence.

Does It Cause Permanent Brain Damage?

In most cases, Sydenham’s chorea does not cause permanent brain damage.

The disorder results from a temporary disturbance in the brain’s movement-control systems, and normal function usually returns as the condition improves.

Who Is Most at Risk?

The groups most commonly affected include:

Children between 5 and 15 years of age
Females, who are affected more often than males
Individuals with a history of recurrent streptococcal throat infections

Is It Related to Epilepsy?

No. Sydenham’s chorea is not related to epilepsy.

It is a movement disorder caused by temporary dysfunction of movement-control centers in the brain, whereas epilepsy results from abnormal electrical activity in the brain. Although both conditions may involve unusual movements, their causes and mechanisms are entirely different.

Is There a Permanent Cure?

Yes. Most patients recover completely.

Successful management includes:

Treating the underlying streptococcal infection
Following preventive therapy as prescribed
Attending regular medical follow-up appointments

In most cases, symptoms eventually disappear completely.

Does the Patient Need Hospitalization?

Mild cases generally do not require hospitalization.
Moderate to severe cases may require short-term hospital admission for symptom control and treatment adjustment.

Can Stress Worsen Symptoms?

Yes. Emotional stress and psychological strain can increase the severity of involuntary movements.

Conversely, adequate sleep, relaxation, and a calm environment often help reduce symptoms.

How Can Sydenham’s Chorea Be Prevented?

The risk may be reduced by:

Preventing streptococcal throat infections
Practicing good hand hygiene and personal cleanliness
Seeking prompt and complete treatment for strep throat with antibiotics
Closely monitoring children with recurrent throat infections

Can Adults Develop Sydenham’s Chorea?

Sydenham’s chorea primarily affects children and adolescents.

Although adults may develop similar movement disorders, these conditions are generally not classified as classic Sydenham’s chorea.

Causes of Sydenham’s Chorea (St. Vitus’ Dance)

Sydenham’s chorea is a neurological movement disorder characterized by sudden, rapid, involuntary movements. It is considered an autoimmune condition that primarily affects children and adolescents. The underlying problem does not originate directly in the brain but rather from an abnormal immune response following a specific infection.

The Main Cause: Previous Streptococcal Infection

The most common trigger is infection with Group A Streptococcus bacteria, which can cause:

Strep throat
Scarlet fever

After the infection, the immune system produces antibodies to fight the bacteria. In some individuals, these antibodies mistakenly attack the body’s own tissues, leading to autoimmune complications.

How Does It Affect the Brain?

This immune reaction can affect a region of the brain known as the basal ganglia, which plays a crucial role in regulating movement and muscle coordination.

When the basal ganglia become affected:

Sudden involuntary movements may occur.
Jerky or irregular motions can develop.
Writing, walking, and fine motor control may become impaired.

Relationship with Rheumatic Fever

Sydenham’s chorea is recognized as one of the neurological manifestations of rheumatic fever.

Rheumatic fever may develop after an untreated or inadequately treated streptococcal throat infection. Because rheumatic fever can also affect the heart, joints, and other organs, early diagnosis and appropriate treatment are essential to prevent long-term complications.

Who Is Most at Risk?

The individuals most likely to develop Sydenham’s chorea include:

Children between 5 and 15 years of age
Females, who are affected more frequently than males
Individuals with a history of recurrent or untreated streptococcal throat infections

Less Common Causes

In rare cases, Sydenham’s chorea-like symptoms may occur in association with:

Pregnancy (particularly during a first pregnancy)
Certain autoimmune disorders

Symptoms of Sydenham’s Chorea (St. Vitus’ Dance)

Symptoms of Sydenham’s chorea typically develop gradually several weeks or even months after a streptococcal throat infection. They result from an abnormal immune response that affects the nervous system, leading to disturbances in movement and behavior.

1. Motor Symptoms (Most Common and Noticeable)

These are the hallmark features of the disorder and may include:

Rapid, sudden, involuntary movements of the hands, feet, or other body parts
Difficulty controlling movements, as though the body is moving on its own
Muscle weakness or loss of balance
Frequently dropping objects due to poor motor control
Changes in handwriting, making it irregular or difficult to read
An unsteady or awkward gait

2. Psychological and Behavioral Symptoms

Some patients may experience emotional and behavioral changes, including:

Sudden mood swings without an obvious cause
Increased irritability or emotional sensitivity
Difficulty concentrating and maintaining attention
Anxiety or mild depressive symptoms in some cases

3. Speech and Eating Difficulties

In certain patients, additional symptoms may develop, such as:

Difficulty pronouncing words clearly
Slow, slurred, or disrupted speech
Difficulty eating or swallowing due to involuntary movements

4. Heart-Related Symptoms (When Associated with Rheumatic Fever)

If Sydenham’s chorea occurs as part of rheumatic fever, additional symptoms may include:

Heart palpitations
Easy fatigue during physical activity
Shortness of breath, particularly if the heart valves are affected

Types of Sydenham’s Chorea (St. Vitus’ Dance)

Although Sydenham’s chorea is considered a single disorder, physicians often classify it according to symptom severity, distribution of involuntary movements, and disease duration. This classification helps guide diagnosis and treatment.

Classification by Symptom Severity

1. Mild Type

Mild involuntary movements
Usually limited to the hands or face
Minimal impact on daily activities
May be mistaken for nervousness or emotional stress

2. Moderate Type

More noticeable and frequent movements
Difficulty with writing and walking
Reduced concentration and motor control
Increasing impact on daily functioning

3. Severe Type

Violent, rapid movements involving large areas of the body
Significant loss of balance
Difficulty eating, speaking, and performing routine activities
May require assistance with daily care

Classification by Distribution of Movements

1. Focal Chorea

Affects a single body region, such as the face or one hand
Relatively uncommon

2. Hemichorea

Affects one side of the body (right or left)
Considered a characteristic presentation of the disorder

3. Generalized Chorea

Involves most muscle groups throughout the body
Represents the most severe and widespread form

Classification by Disease Duration

1. Acute Form

Lasts from several weeks to a few months
Usually improves gradually with treatment

2. Chronic or Recurrent Form

Symptoms return after a period of improvement
Often associated with recurrent streptococcal infections or poor adherence to preventive therapy

Stages of Sydenham’s Chorea (St. Vitus’ Dance)

Sydenham’s chorea usually develops gradually rather than appearing suddenly. It progresses through several stages following a streptococcal throat infection.

Stage 1: Post-Infection Phase (Silent Phase)

Occurs after a throat or tonsil infection
No obvious neurological symptoms are present
The immune system begins producing antibodies against the bacteria
This phase may last several weeks to 2–3 months

Stage 2: Early Neurological Symptoms

Mild involuntary movements begin to appear
Subtle difficulties with concentration or handwriting
Mood changes such as irritability or anxiety
Symptoms may be intermittent and difficult to recognize initially

Stage 3: Active Phase

Involuntary movements become more obvious
Walking and balance problems develop
Difficulty controlling hand movements or speech
Increased fatigue and reduced ability to perform daily activities

Stage 4: Recovery Phase

Symptoms gradually begin to improve
Involuntary movements become less frequent and less severe
Concentration, speech, and walking improve
Recovery may continue for several months depending on disease severity and treatment

Stage 5: Possible Relapse (Some Cases)

Symptoms may return if:

A new streptococcal throat infection occurs
Preventive treatment for rheumatic fever is not followed properly

When relapse occurs, symptoms are often similar to or milder than those experienced during the initial episode.

Complications of Sydenham’s Chorea (St. Vitus’ Dance)

Although Sydenham’s chorea is usually a temporary condition that responds well to treatment, complications can occur, particularly when the underlying cause—such as streptococcal infection or rheumatic fever—is not adequately treated.

1. Neurological Complications

Potential neurological complications include:

Persistence of involuntary movements for longer than expected
Difficulty with concentration and attention
Learning difficulties or reduced academic performance in children
Mild balance and motor coordination problems

2. Cardiac Complications (The Most Serious Concern)

Because Sydenham’s chorea is associated with rheumatic fever, it may affect the heart and lead to:

Inflammation or damage to the heart valves, especially the mitral valve
Heart palpitations or irregular heart rhythms
Shortness of breath during physical exertion
In severe cases, long-term impairment of cardiac function

3. Disease Recurrence (Relapse)

Symptoms may return if:

The patient develops another streptococcal throat infection
Preventive treatment is not followed consistently

The severity of recurrent episodes may vary from one occurrence to another.

4. Psychological and Behavioral Complications

Some patients may experience:

Anxiety or emotional distress related to loss of movement control
Mood swings and irritability
Feelings of embarrassment or social withdrawal, particularly among children

5. Impact on Daily Life

Severe symptoms may interfere with routine activities such as:

Writing
Eating
Dressing independently

In some cases, temporary disruption of school performance or daily activities may occur, and assistance may be required during severe episodes.

Diagnosis and Long-Term Prognosis of Sydenham’s Chorea

Diagnosis

The diagnosis of Sydenham’s chorea is based on a combination of clinical findings, medical history, and supporting laboratory tests, as there is no single test that definitively confirms the condition.

1. Clinical Evaluation

The physician evaluates for:

Rapid, irregular, involuntary movements
Impaired motor control affecting the hands, gait, or handwriting
Emotional or behavioral changes
Symptoms that worsen with stress and improve during sleep

2. Medical History

A detailed medical history is essential and may include:

Previous episodes of streptococcal throat or tonsil infection
A history of rheumatic fever
Gradual onset of symptoms

3. Laboratory Tests

Laboratory investigations cannot diagnose Sydenham’s chorea on their own but can support the diagnosis.

Common tests include:

ASO (Anti-Streptolysin O) titer: Often elevated following streptococcal infection
C-reactive protein (CRP): Used to assess inflammation
Erythrocyte Sedimentation Rate (ESR): Another marker of inflammation

4. Excluding Other Conditions

Additional tests may be required to rule out:

Epilepsy or seizure disorders
Inherited movement disorders
Certain neurological or autoimmune diseases

Long-Term Prognosis

1. In Most Cases

The outlook is generally excellent.

The condition is usually temporary and lasts from several weeks to a few months.
Most children recover completely without permanent neurological damage.
Improvement is typically gradual until symptoms fully resolve.

2. Risk of Recurrence

Relapse may occur if a new streptococcal infection develops.

However:

The risk decreases significantly with appropriate preventive treatment.
Recurrence is relatively uncommon when regular medical follow-up is maintained.

3. Cardiac Outcomes (Most Important Long-Term Factor)

The primary long-term concern is not the movement disorder itself, but its association with rheumatic fever.

Potential cardiac consequences include:

Damage to the heart valves
The need for long-term cardiology follow-up in some patients

Permanent cardiac complications are uncommon when early diagnosis and treatment are provided.

4. Long-Term Neurological Outcomes

Sydenham’s chorea does not typically cause permanent brain damage.

In rare cases, mild symptoms such as temporary balance difficulties or reduced concentration may persist for a short period after recovery.

Medications Used to Treat Sydenham’s Chorea

Treatment focuses on two main goals:

Controlling involuntary movements
Treating the underlying streptococcal infection and preventing recurrence

1. Treatment of the Underlying Cause (Antibiotic Therapy)

Even when throat symptoms have resolved, eradication of the causative bacteria is essential.

Penicillin

Penicillin remains the first-line and most commonly prescribed treatment.

It may be administered as:

Oral tablets for selected cases
Long-acting intramuscular injections every 3–4 weeks for secondary prevention

Alternatives for Patients with Penicillin Allergy

If penicillin cannot be used, alternative antibiotics may include:

Azithromycin
Erythromycin

Primary Treatment Goal

The primary objective of treatment is to eradicate the streptococcal infection, prevent rheumatic fever, and reduce the risk of disease recurrence.

2. Medications for Controlling Involuntary Movements

These medications may be prescribed when symptoms significantly interfere with daily activities.

1. Mild Antipsychotic Medications

Haloperidol
Risperidone

Benefits:

Can significantly reduce involuntary movements

Possible Side Effects:

Drowsiness
Mild muscle stiffness or rigidity

2. Anticonvulsant Medications

Sodium Valproate
Carbamazepine

Benefits:

Help stabilize excessive nervous system activity
Reduce irregular involuntary movements

3. Additional Sedative Medications

Clonazepam

Benefits:

Calms the nervous system
May reduce involuntary movements

Precautions:

Should be used cautiously because of potential drowsiness and the risk of dependence with prolonged use

3. Treatment of Severe or Refractory Cases

In rare cases where symptoms are severe or resistant to conventional treatment, additional therapies may be considered.

Corticosteroids

Examples include:

Prednisolone

Benefits:

Reduce immune-mediated inflammation affecting the nervous system

Immunotherapy (Rarely Used)

Intravenous Immunoglobulin (IVIG)

May be considered for patients who do not respond adequately to standard treatments.

4. Long-Term Preventive Therapy

Even after clinical improvement, some patients may require ongoing preventive treatment.

Long-Acting Penicillin Injections

Typically administered every 3–4 weeks

Purpose:

Prevent recurrent streptococcal throat infections
Reduce the risk of symptom recurrence and rheumatic fever complications

Duration of Treatment

Neurological symptoms usually improve within weeks to months.
Preventive antibiotic therapy may continue for several years depending on the physician’s assessment, particularly in patients with a history of rheumatic fever.

Physical Therapy and Exercise for Sydenham’s Chorea

Exercise is not considered a primary treatment for Sydenham’s chorea, but it serves as an important supportive therapy. Physical rehabilitation can help improve motor control, restore balance, and enhance recovery.

Goals of Exercise Therapy

Exercise programs aim to:

Improve control of involuntary movements
Strengthen weakened muscles
Enhance balance while standing and walking
Reduce the risk of falls
Improve coordination between the nervous system and muscles

Balance and Walking Exercises

1. Structured Walking

Walk slowly in a straight line
Focus on steady, controlled steps
Use support such as a wall or caregiver when necessary

2. Single-Leg Standing

Stand on one foot for 10–20 seconds
Begin with support from a chair or wall if needed

Benefits:

Improves balance and postural control

Muscle-Strengthening Exercises

1. Hand Exercises

Slowly open and close the hands
Pick up lightweight objects such as a small ball or sheets of paper

2. Arm Exercises

Raise the arms upward and then to the sides
Perform movements slowly and in a controlled manner to minimize tremor

Neuromotor Training

1. Fine Motor Coordination Exercises

Touch the tip of the nose with a finger
Repeat the movement slowly while maintaining concentration

2. Writing and Drawing Activities

Practice writing large letters slowly
Draw simple shapes and patterns

Benefits:

Improves hand-eye coordination and fine motor skills

Relaxation Exercises

Because stress may worsen symptoms, relaxation techniques can be beneficial.

Examples include:

Slow, deep breathing exercises
Progressive muscle relaxation
Stress-reduction strategies and emotional support

Important Safety Recommendations

Perform exercises slowly and carefully.
Avoid excessive physical exertion.
Exercises should ideally be supervised by parents, caregivers, or a physical therapist.
Stop the activity if involuntary movements become significantly worse.

Prevention of Sydenham’s Chorea (St. Vitus’ Dance)

Prevention focuses primarily on avoiding or promptly treating the underlying causes—streptococcal throat infections and rheumatic fever.

1. Early and Appropriate Treatment of Strep Throat

This is the most important preventive measure.

Recommendations include:

Seeking medical evaluation for sore throat or tonsillitis symptoms
Using prescribed antibiotics exactly as directed
Completing the entire course of treatment, even if symptoms improve early

Untreated streptococcal infections are the main factor that may lead to the development of Sydenham’s chorea and rheumatic fever.

2. Preventive Antibiotic Therapy for High-Risk Individuals

For some patients, particularly those with a history of rheumatic fever, physicians may recommend:

Regular antibiotic tablets or injections
Long-acting penicillin prophylaxis for an extended period

Purpose:

Prevent recurrent infections
Reduce the likelihood of symptom recurrence

3. Personal Hygiene and Infection Prevention

Good hygiene practices can help reduce exposure to streptococcal infections:

Wash hands regularly
Avoid sharing personal items such as cups, utensils, or water bottles
Cover the mouth and nose when coughing or sneezing
Avoid close contact with individuals who have untreated throat infections

4. Prevention in Schools and Crowded Environments

Recommended measures include:

Keeping children with strep throat away from school until treatment has begun
Teaching children not to share personal items
Monitoring recurrent throat infections within households and schools

5. Follow-Up for Rheumatic Fever (Most Important Long-Term Measure)

Children with a history of rheumatic fever should:

Attend regular follow-up visits with appropriate specialists, such as cardiologists or neurologists
Adhere strictly to preventive treatment plans
Undergo cardiac evaluation when recommended

This step is essential for preventing long-term complications.