Dystonia is a neurological movement disorder in which the brain sends abnormal signals to muscles, causing them to contract involuntarily. This leads to twisting movements, repetitive motions, or abnormal postures in the neck, limbs, eyes, or voice. Treatment includes medicines, botulinum toxin (BOTOX) injections, physiotherapy, or, in severe cases, deep brain stimulation.
Have you ever felt your hand cramp while writing, your foot twist while walking, or your neck suddenly pull to one side?
For people with dystonia, these involuntary muscle contractions are a daily reality. Dystonia is a neurological movement disorder that causes muscles to contract uncontrollably, leading to repetitive movements or abnormal postures.
It affects an estimated 1 in 1,000 people worldwide, yet many people don’t know about it. In this blog, we will talk about what causes dystonia, how to spot its symptoms and the treatment options helping people manage it today.
Dystonia is a neurological movement disorder that occurs when the brain’s movement-control networks send abnormal signals to muscles. This leads to unwanted muscle activity that can be constant or come and go.
For example, a person with cervical dystonia may find that their neck repeatedly turns or tilts to one side. Someone with focal hand dystonia (also called writer’s cramp) may develop abnormal hand or finger movements specifically when they are writing.
The underlying issue of this disorder involves the nervous system. Unlike some movement disorders that cause weakness or a loss of movement, dystonia is characterised by too much muscle activity. Muscles that should stay relaxed instead tense up, pulling body parts into twisted, repetitive or awkward positions.
Dystonia can affect just one part of the body (focal dystonia), two or more adjacent areas (segmental dystonia), or multiple unrelated body parts at once (generalised dystonia). It can affect a person at any age, though the pattern often differs between children and adults.
Symptoms depend on which muscles are affected and how the condition develops. Some common symptoms include:
Symptoms can also vary during the day and may become more evident with stress, fatigue or particular activities.
Dystonia can be classified according to the parts of the body affected.
Focal dystonia: It affects one body region. For example,
Segmental dystonia: It affects two or more neighbouring areas, such as the neck and an arm.
Multifocal dystonia: It affects two or more unrelated or non-adjacent areas of the body. For example, the eyelids and a foot.
Generalised dystonia: It affects multiple areas of the body, mostly involving the trunk and several limbs.
Hemidystonia: It affects one side of the body.
Sometimes the exact cause of dystonia cannot be identified. In other cases, it may result from a genetic change, another neurological condition, brain injury or certain medicines.
Some possible causes include:
Diagnosis usually begins with a neurological examination, where the neurologist observes the movements, posture and situations in which symptoms occur.
The movement disorder specialist may ask:
Depending on the suspected cause, the specialist may recommend brain imaging tests, blood tests or genetic testing.
The approach of treatment can vary from person to person. Treatment is chosen according to the type of dystonia, affected muscles, severity, underlying cause and how much symptoms interfere with daily life.
The movement disorder specialist may prescribe medicines that reduce abnormal muscle activity or influence chemical signalling in the brain. The choice depends on the individual’s symptoms and response and side effects need to be considered.
Botulinum toxin, commonly known as Botox, can be injected into selected overactive muscles. It temporarily reduces the nerve signals that cause those muscles to contract.
It is particularly useful for many forms of focal dystonia, including cervical dystonia and blepharospasm. Because its effect wears off, injections generally need to be repeated.
Rehabilitation may help maintain movement, improve function and make everyday activities easier. An occupational therapist can also suggest practical adaptations for work or daily tasks.
For some people with severe dystonia that remains disabling despite other treatments, deep brain stimulation (DBS) may be considered.
DBS involves placing electrodes in specific movement-related areas of the brain. A small implanted device then delivers controlled electrical stimulation. DBS can reduce dystonia symptoms and disability in appropriately selected patients.
You should consider seeking medical evaluation if involuntary movements, muscle contractions or abnormal postures:
A movement disorder neurologist can evaluate whether the symptoms are due to dystonia or another condition and determine which investigations and treatments may be appropriate.
If you or a family member is experiencing the symptoms of dystonia, an evaluation can help clarify what is happening and whether treatment is needed. The Neurology and Neurosciences Department at the CK Birla Hospital can provide specialist assessment for movement disorders such as dystonia. Simply book a consultation to get expert guidance.
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