What is Dystonia and Tremor? Symptoms, Types and Current Treatment Options

If you are wondering what dystonia is, it is the most common movement disorder after Parkinson's disease and essential tremor. Approximately 250,000 people in the United States have this condition, and about one-third of them are children.

Causing involuntary and continuous contraction of muscles, this neurological disorder can appear at any age and its severity ranges from mild to severe. Despite this, dystonia is not very well known by the public and can cause movements such as twisting and bending in a specific region of the body or widespread. In this article, you will find answers to questions such as what dystonia and tremor are, what their symptoms are, what causes dystonia, and how it is treated.

What are dystonia and tremor?

Holding an important place among movement disorders, dystonia and tremor are neurological conditions with different characteristics. These two disorders occur as a result of improper functioning of nerve signals in the brain and can significantly affect patients' quality of life.

Definition and general characteristics of dystonia

Dystonia is a movement disorder in which muscles contract involuntarily. It is the most common type of movement disorder after conditions such as Parkinson's disease and essential tremor. This disorder is characterized by involuntary muscle contraction, leading to twisting movements or abnormal postures.

In dystonia, muscles contract unexpectedly, either spontaneously or during voluntary movements. It can occur in only one part of the body (focal), in two adjacent parts (segmental), or throughout the entire body (generalized).

This condition can lead to problems such as body pain, postural disorders, and tremor in the vocal cords in patients. Muscle spasms can be mild or severe and can adversely affect daily life. Additionally, dystonia can increase in cases of stress, sadness, and fatigue, while it can decrease during rest, calming, and sleep.

Usually seen in adults, dystonia can also occur in children in some cases. While dystonia starting in childhood can affect many parts of the body, in adulthood it frequently affects only one part of the body.

What is a tremor?

Tremor is a neurological disorder that causes involuntary and uncontrollable shaking or trembling movements, most commonly seen in the hands but can also affect the arms, legs, head, and vocal cords. Also known as trembling disease, although this condition is not life-threatening, it can make daily activities such as writing, eating, shaving, and dressing difficult.

Tremor is basically divided into two main groups:

Rest tremor: Occurs when remaining motionless for a long time or lying down. The tremor disappears when the patient moves.

Action tremor: Appears while holding the arms horizontally or during movement.

The most common symptoms of tremor are rhythmic shaking of the hands, arms, head, legs, or torso, a shaky voice, and difficulty writing or drawing. However, tremor can appear in different types such as essential tremor, dystonic tremor, cerebellar tremor, functional tremor, and Parkinson's tremor.

Differences between dystonia and tremor

Both disorders are movement disorders and originate from the same regions of the brain. However, their mechanisms and clinical findings are different.

While Parkinson's disease is fundamentally characterized by tremor, slowness of movement, and stiffness, dystonia manifests itself with involuntary muscle contraction. On the other hand, while Parkinson's disease can affect the entire body, dystonia may affect only specific muscle groups or all muscles in the body.

Tremor appears by definition as a rhythmic movement. Dystonic tremor, on the other hand, causes muscles to become overactive as a result of incorrect messages coming from the brain, leading to abnormal postures or unwanted movements.

The treatment of both disorders is quite different from each other. Therefore, correct diagnosis is of great importance for effective treatment.

Types and classification of dystonia

The classification of dystonia is an important step in the diagnosis and treatment process of the disease. This movement disorder is divided into various categories according to different characteristics. Classification is usually made based on three main factors: age of onset of complaints, affected part of the body, and underlying causes.

Difference between primary and secondary dystonia

Depending on the cause, dystonia is examined in two main groups: primary and secondary. Understanding the differences between these two types is of great importance in determining treatment approaches.

Primary (Idiopathic) Dystonia: Primary dystonia, whose cause is uncertain, is usually seen in young people between the ages of 20-30. In this type of dystonia, there are no other neurological findings other than the disease. Primary dystonias are the most common movement disorder following essential tremor, tics, and Parkinson's disease.

Most primary dystonias occur in adults and are of the focal or segmental type. Additionally, there are child or adult dystonia types with genetic transmission. For example, early-onset dystonias resulting from a mutation of the DYT1 gene on the long arm of chromosome 9 (9q34.1) begin in childhood or young adulthood. In 90-95% of cases, it starts in the arms or legs and spreads from there.

Secondary (Symptomatic) Dystonia: This type of dystonia develops due to a specific cause. Secondary dystonias seen after birth generally originate from external factors such as drug side effects or exposure to various toxins.

Brain tumors, cerebral palsy, Parkinson's disease, stroke, multiple sclerosis, hypoparathyroidism, vascular malformations, brain/spinal cord injury, inflammation, brain infections, and certain medications can cause secondary dystonia. However, considering the patient's age, personal history, family history, and accompanying conditions, diagnosis can be made easily.

Focal, segmental, and generalized dystonia

Another way of classifying dystonia is according to the affected areas of the body. This classification serves as a guide in both diagnosis and treatment processes.

Focal Dystonia: Affects only one part of the body. The most common type is cervical dystonia (spasmodic torticollis). Other types of focal dystonia include blepharospasm (eyelid), oromandibular dystonia (jaw/mouth/lower face), laryngeal dystonia (vocal cords), and limb dystonia (arm-leg). Focal dystonias are frequently seen in adult dystonias starting in the 40s and 50s, and occur 3 times more often in women than in men.

Segmental Dystonia: Affects two or more adjacent body parts. Approximately 30% of patients with focal dystonia also have dystonia in an adjacent part. Most frequently, segmental dystonia affects the eyelid, jaw, mouth, and lower half of the face.

Generalized Dystonia: In this type, the disease affects the entire body. Contraction disorders that usually start in a single arm or leg spread to different parts of the body over time. Generalized dystonia typically begins in childhood and may progress with age.

What are multifocal and hemidystonia?

Multifocal Dystonia: A type of dystonia in which two or more independent (non-adjacent) regions of the body are affected. For example, it can be seen in one arm and one leg, two non-adjacent arms, or the trunk and facial regions.

Hemidystonia: A type of dystonia in which one side of the body, or in other words, the arm and leg on the same side, are affected. It generally occurs due to a structural lesion in the contralateral basal ganglia, especially the putamen. These types of dystonias mostly depend on secondary causes and are rarer than focal dystonias.

The age factor is also an important factor in the classification of dystonia. Dystonia may show different characteristics in children aged 0-12, adolescents aged 13-20, and adults over 20.

For correct diagnosis and effective treatment, determining the type and classification of dystonia is of great importance. Because each type of dystonia requires different treatment approaches.

Subtypes of dystonia

Different subtypes of dystonia are named according to the body regions they affect, and each has its own unique symptoms. In this section, we will examine the most common types of dystonia and their characteristics.

Cervical dystonia (neck muscles)

Cervical dystonia is the most common type of focal dystonia. In this condition, also known as torticollis or spasmodic torticollis, involuntary contraction of the neck muscles can cause your head to turn into abnormal positions or tremble. Your head may tilt to the right, left, forward, or backward.

Symptoms generally manifest as involuntary turning of the head, pain, and stiffness in the neck muscles. Although this condition can be seen at any age, it mostly begins in middle age. Initial mild symptoms may progress over time. Additionally, complaints may increase in situations of stress and fatigue.

Cervical dystonia, which is seen 3 times more frequently in women than in men, usually occurs as primary (without any identifiable cause). It can negatively affect patients' social lives and lead to depression symptoms.

Blepharospasm (eye muscles)

Blepharospasm is the second most common type of dystonia, caused by involuntary contraction of the muscles that enable blinking. Occurring in one out of every 20 thousand people, this condition usually appears after the age of 40.

Its first symptom is an increase in blinking frequency. It is mostly seen in both eyes and can lead to complete closure of the eye in the progressing process. Although there is no impairment in vision, it can create functional blindness.

Among the symptoms of blepharospasm are involuntary eyelid spasms, increased blinking frequency (10-20 times per minute), pain and discomfort, and visual disturbances. Environmental factors such as stress, fatigue, bright light, and wind can trigger or worsen symptoms.

Oromandibular dystonia (jaw and tongue)

Oromandibular dystonia (OMD) is a type of focal dystonia affecting the lip, jaw, and tongue muscles. This condition usually manifests itself with the prominent opening or closing of the jaw.

Symptoms begin between the ages of 40 and 70 and are more common in women. Symptoms may appear only during specific activities such as speaking or chewing. Factors such as stress, talking, chewing food, and praying can trigger the disorder.

In the presence of oromandibular dystonia, speech disorders (dysarthria), chewing and swallowing problems, drooling, and teeth grinding (bruxism) may occur. This situation makes it difficult to perform daily activities and reduces the quality of life.

Spasmodic dystonia (vocal cords)

Spasmodic dystonia, also called laryngeal dystonia, occurs when the muscles controlling the vocal cords are affected. In this type of dystonia, which is more common in women, significant deteriorations occur in voice quality.

Patients have difficulty during speech and experience interruptions in their voice. The voice comes out hoarse, strained, and with effort. In advanced cases, the voice can be very inadequate and at a level that disturbs both the speaker and the listener.

Interestingly, patients' symptoms may disappear during reflexive phonation such as coughing, crying, laughing, or yawning. Changes in complaints can be seen during singing or whispering.

Writer's cramp and task dystonias

Writer's cramp is the most common type of task dystonia. This dystonia, which predisposition is created by continuously repeated fine motor movements, causes involuntary contractions that occur while writing or simply holding a pen.

If writer's cramp is only seen while writing, it is defined as a "simple writer's cramp." If similar contractions are present in other hand movements, it is called "dystonic writer's cramp." Cases where wrist and shoulder involvement are seen also exist.

Task dystonias are frequently encountered in certain professions such as secretarial work, painting, baking, musicianship, and dart or golf players. It can prevent performing specific activities such as playing a musical instrument or writing.

Each of the dystonia subtypes can significantly affect the quality of life. Therefore, early diagnosis and the correct treatment approach are of great importance for patients to maintain their daily lives.

What causes dystonia and how is it diagnosed?

Although the exact cause of dystonia is not fully known, various factors can lead to the emergence of this condition. It is thought that there is a disruption in the communication of nerve cells in the regions of the brain that regulate motor movements.

Genetic and hereditary factors

Some types of dystonia show hereditary characteristics. Genetic factors play an important role, especially in early-onset dystonia cases. One of the most common genetic causes is the DYT1 gene mutation, which affects torsin A, a protein that enables muscles to function normally.

Up to 15 types of genetic dystonia can be distinguished so far. Among these are types such as primary generalized dystonia with DYT1 mutation, myoclonic dystonia with DYT11 mutation, and Lubag dystonia containing DYT3 mutation.

Low penetrance can be seen in genetic dystonias. That means even if the person carries the mutation, the disease may not develop. Therefore, even if you do not have a family history of dystonia, genetic transmission is possible.

Trauma, infection, and drug effects

Conditions referred to as secondary dystonia can develop due to various factors:

Neurological diseases: Parkinson's, Huntington's, and Wilson's diseases

Brain damage: Traumatic brain injury, birth injuries, and stroke

Tumors: Brain tumors resulting from cancer

Oxygen deprivation: Carbon monoxide poisoning

Infections: Such as tuberculosis, encephalitis (brain inflammation)

Drug reactions: As a side effect of certain antipsychotic medications

Toxins: Heavy metal poisonings

Additionally, metabolic abnormalities and various environmental factors can also contribute to the development of dystonia. Therefore, if you are experiencing symptoms of dystonia, it is important to inform your doctor about past traumas and medications you use.

EMG, MRI, and genetic tests

Dystonia is usually diagnosed by a neurology specialist. The diagnostic process includes the following steps:

Physical examination and taking history: First, your doctor will inquire when your complaints started, the affected body regions, and the progression status of the disease.

Laboratory tests: Blood and urine tests are performed to investigate toxins or metabolic disorders.

Imaging methods: Abnormalities such as brain tumors, lesions, or evidence of stroke are examined with MRI (Magnetic Resonance Imaging) or CT (Computed Tomography).

Electromyography (EMG): This test, which measures electrical activity in muscles, can help diagnose dystonia.

Genetic tests: Especially in cases with a family history or dystonia starting at an early age, genetic tests can be used to confirm the diagnosis.

Besides these, evaluation of the effects of dystonia during activities that are important in daily life and standardized video recordings can also assist in the diagnostic process. Short memory and behavior patterns are also measured with the Mini-Mental test.

Remember that every patient's dystonia experience is different, and correct diagnosis is the first step of an effective treatment plan.

Dystonia treatment and new approaches

Dystonia treatment is a process that needs to be planned individually according to the type and severity of the disease. Modern medicine offers various treatment options that can help dystonia patients.

Botulinum toxin (botox) applications

Botulinum toxin injections are one of the most commonly used methods in dystonia treatment. This treatment can improve abnormal posture by reducing involuntary muscle contractions. It has been observed that it provides a 60-80% improvement in head posture, especially in cervical dystonia patients.

Botox injections are usually made directly into the affected muscle, and their effect starts within the first week and lasts 3-4 months. At the end of this period, treatment may need to be repeated. In some cases, performing injections under EMG (electromyography) guidance may be more beneficial.

Botox injection is an effective option, especially for focal dystonias. However, side effects such as swallowing difficulty, dry mouth, and neck weakness may be observed.

Physical therapy and speech therapy

Physical therapy is applied as a support to medication or injection treatments in dystonia treatment. It provides benefits such as reducing muscle tension, posture control, and increasing muscle flexibility.

Physical therapy studies performed in dystonia patients:

Increasing muscle flexibility with stretching exercises

Developing voluntary movements with coordination exercises

Muscle strengthening exercises

Especially in focal dystonia and segmental dystonia types, robot-assisted exercises can provide significant improvement. Speech therapy plays an important role in improving voice quality, especially in laryngeal dystonia patients.

Deep brain stimulation (brain pacemaker)

Deep brain stimulation (DBS) is a surgical method used in severe dystonia cases that do not respond to other treatments. Electrodes are placed to regulate abnormally functioning nerves in the brain.

DBS is particularly effective in primary generalized dystonias and can provide a 67% improvement in motor scores. The most appropriate target in treatment is the GPi (globus pallidus internus) nucleus in the brain.

Most suitable candidates for DBS:

Patients aged 7 and over

Chronic primary dystonia patients who cannot be successfully treated with medications

Transcranial magnetic stimulation

Transcranial magnetic stimulation (TMS) is a non-invasive treatment method that can reduce dystonia symptoms by stimulating specific regions in the brain with magnetic pulses.

The target in TMS treatment is the part of the brain called the premotor cortex. Overactive regions of the brain can be suppressed with low-frequency magnetic stimulation. It has been observed to be effective especially in patients with writer's cramp.

Treatment is generally applied daily, and approximately 1200 stimuli are delivered in each session. The healing effect of this treatment, which lasts for a total of 10 days, can continue for a long time after the treatment is discontinued.

Warnings regarding herbal treatment

Dystonia is not a disease that can be treated with herbal methods. Such practices should not be used without doctor consultation. Experts recommend choosing scientifically proven methods in the treatment of dystonia.

In conclusion, different approaches may be required for each patient in dystonia treatment. Treatment selection should be made by considering the type, severity of dystonia, and the patient's other health conditions.

Frequently Asked Questions

Depending on your age, gender, and family history, you should have screening tests such as regular blood tests, mammography, colonoscopy, PSA test, and skin examination as often as your doctor recommends.

The presence of certain diseases in your family can increase your risk of contracting those diseases as well. In this case, you should inform your doctor about your family history and start recommended screenings at an earlier age.

A balanced diet, regular physical activity, adequate sleep, stress management, and social support help maintain your quality of life during the treatment process. Additionally, it is important to have open communication with your doctor about treatment side effects.

Alternative treatments can support your main treatment but should never replace your main treatment. Consult your doctor before trying such methods, because some alternative treatments may interact with your current drug treatment.

After your treatment is completed, it is important to regularly attend follow-up appointments recommended by your doctor, maintain a healthy lifestyle, and consult your doctor immediately if you notice any suspicious symptoms.

Dystonia and tremor appear as important movement disorders occurring due to the irregularity of brain signals. However, effective treatment is possible with correct diagnosis.

Dystonia usually starts insidiously and can progress over time. However, recognizing the disease in the early period significantly increases the success of treatment. Therefore, when you notice symptoms such as involuntary muscle contractions or trembling, you should consult a specialist immediately.

Treatment options are quite diverse. Botox injections give effective results especially in focal dystonias. Additionally, methods such as physical therapy, speech therapy, and deep brain stimulation can significantly increase the patient's quality of life. Remember that every patient's dystonia experience is different and the treatment plan must be prepared individually.

Factors such as stress and fatigue can trigger dystonia symptoms. Therefore, it is important to reduce stress in your daily life and rest regularly. Additionally, regular exercise programs can also alleviate symptoms by increasing muscle flexibility.

Finally, it is of great importance to choose scientifically proven methods in the treatment of dystonia and tremor. You should be careful about herbal treatments and definitely consult your doctor. Today, thanks to medical developments, most dystonia patients can lead a normal life.

The earlier your disease is diagnosed, the more successful the treatment will be. Therefore, do not ignore symptoms and do not hesitate to get expert help when necessary.

Get Expert Support for Dystonia and Tremor

If you are experiencing involuntary muscle contractions, tremor, or abnormal posture problems, early diagnosis is of great importance.

At Hisar Hospital Intercontinental Neurology Department, an individualized treatment plan is created by our experienced specialist physicians using advanced diagnostic methods (EMG, MRI, genetic tests) and modern treatment options (Botulinum toxin applications, physical therapy, advanced neuromodulation methods).

Do not postpone your health.

Contact us for detailed information and appointments.