Dyskinesia refers to abnormal, involuntary movements that a person cannot fully control. The word comes from Greek, literally meaning “difficulty of moving,” but in modern medicine it describes movements that are excessive or unwanted rather than too little movement. These movements can range from subtle twitches around the mouth to large, flowing motions of the arms and legs, and they most commonly develop as a side effect of certain medications.
What Dyskinesia Looks and Feels Like
Dyskinesia movements are characterized by their irregularity. Unlike a tremor, which is rhythmic and repetitive (think of a hand shaking back and forth in a steady pattern), dyskinesia produces movements that are unpredictable in timing and direction. They often look like exaggerated fidgeting or a flowing, dance-like motion. A person might have writhing fingers, rocking of the trunk, lip smacking, tongue movements, or twisting postures that come and go throughout the day.
The movements are technically involuntary, but some people describe them as semi-voluntary. For example, someone with repetitive tongue movements might feel an uncomfortable sensation in their mouth that drives them to move their tongue, blurring the line between something that happens to you and something you do in response to a feeling. This distinction matters because it means dyskinesia isn’t always as “out of the blue” as it appears to an outside observer.
The Main Types of Dyskinesia
Dyskinesia is an umbrella term. The specific pattern of movement determines which subtype a person has:
- Chorea: Brief, irregular, somewhat rapid movements that repeat across the face, mouth, trunk, arms, and legs. Chorea can look like exaggerated fidgeting and tends to flow from one body part to another.
- Dystonia: Sustained or repetitive muscle contractions that force the body into twisting, abnormal postures. Dystonia can affect one body part (like the neck pulling to one side) or the entire body.
- Athetosis: Slow, writhing, snake-like movements, particularly in the hands and fingers. These are often described as serpentine.
- Ballismus: Large, flinging movements of the limbs, typically on one side of the body. This is the most dramatic and least common form.
A single person can experience more than one type at once. It’s also possible to have dyskinesia in one body part while a different body part shows a tremor, which can make the condition confusing for patients trying to describe what’s happening.
Levodopa-Induced Dyskinesia in Parkinson’s Disease
The most well-known cause of dyskinesia is long-term use of levodopa, the primary medication for Parkinson’s disease. About 25% of Parkinson’s patients develop dyskinesia after five years of levodopa therapy, and that number climbs to roughly 80% after ten years. This creates a difficult tradeoff: levodopa is the most effective drug for controlling Parkinson’s stiffness and slowness, but the longer you take it, the more likely it is to produce these excess movements.
The underlying problem involves how the brain processes dopamine. In Parkinson’s disease, dopamine-producing cells die off gradually. Levodopa replaces the missing dopamine, but over time, the remaining brain cells become overly sensitive to it. Certain nerve cells in the brain’s movement-control center start expressing higher levels of dopamine receptors and become hyper-responsive. When levodopa floods these sensitized cells, they fire excessively, producing the characteristic involuntary movements. The dyskinesia typically peaks when medication levels are highest in the bloodstream and fades as they drop.
Tardive Dyskinesia From Psychiatric Medications
Tardive dyskinesia (TD) is a distinct form that develops after prolonged use of medications that block dopamine, particularly antipsychotics. “Tardive” means late-appearing, reflecting the fact that TD usually emerges after months or years of treatment rather than right away.
TD most often affects the face and mouth. Repetitive lip smacking, puckering, tongue protrusion, chewing motions, and grimacing are the hallmark signs. It can also involve the limbs and trunk. The condition occurs most frequently with older antipsychotic medications, but newer ones carry risk too. Anti-nausea drugs that block dopamine, certain antidepressants, lithium, and even some calcium channel blockers have been linked to TD. The frustrating reality is that TD can persist even after the medication causing it is stopped, though symptoms do improve in some cases.
How Dyskinesia Affects Daily Life
The practical impact of dyskinesia extends well beyond the movements themselves. Swallowing can become difficult, making eating slower and sometimes risky. Fine motor tasks like handwriting may deteriorate. Stress reliably makes things worse: if all eyes are on you during a presentation or a high-pressure moment, whatever movements you normally experience are likely to intensify significantly.
Social isolation is one of the most damaging consequences. Visible, involuntary movements draw attention, and many people with dyskinesia withdraw from social situations to avoid stares or awkward questions. This withdrawal can worsen underlying mental health conditions, creating a cycle that’s hard to break. People living with TD often find it helpful to adapt their social lives rather than abandon them entirely, gravitating toward smaller, more comfortable gatherings with people who understand what’s happening.
How Dyskinesia Is Assessed
Doctors evaluate dyskinesia using a standardized tool called the Abnormal Involuntary Movement Scale (AIMS). During the assessment, a clinician observes seven specific body areas: facial muscles (forehead, eyebrows, cheeks), lips, jaw, tongue, upper limbs, lower limbs, and trunk (including neck, shoulders, and hips). Each area is scored from 0 (no abnormal movement) to 4 (severe), and the clinician records the highest severity observed during the exam. AIMS testing is recommended at regular intervals for anyone taking medications that carry a dyskinesia risk, since catching it early gives you more options.
Treatment Options
Treatment depends on which type of dyskinesia you’re dealing with. For levodopa-induced dyskinesia in Parkinson’s, the first strategy is usually adjusting the dose or timing of Parkinson’s medications to smooth out the peaks and valleys of dopamine levels in the brain. Amantadine, a medication that works on a different brain signaling system, is commonly added to reduce dyskinesia without sacrificing Parkinson’s symptom control.
For tardive dyskinesia, the FDA has approved medications called VMAT2 inhibitors. These drugs work by reducing the amount of dopamine packaged into nerve cells, which tones down the excessive signaling that causes TD movements. Valbenazine, one of the approved options, is taken once a day and can be used alongside most antipsychotics and antidepressants, which matters because many people with TD still need the psychiatric medication that contributed to the problem. It’s also available in a form that can be sprinkled onto food for people who have trouble swallowing pills.
For severe levodopa-induced dyskinesia that doesn’t respond well to medication adjustments, deep brain stimulation (DBS) is an option. This surgical procedure involves implanting small electrodes in the brain’s movement centers. Over a 15-year follow-up period, patients treated with DBS showed a 75% reduction in dyskinesia from their baseline, along with 59% less “off” time (the periods when Parkinson’s symptoms break through) and the ability to cut their dopamine medication doses roughly in half. DBS isn’t a cure, but it remains effective for well over a decade in many patients.