Spasticity, Tremors, and Ataxia: How Therapy Helps Abnormal Movements

Our bodies rely on the brain, spinal cord, nerves, and muscles working together to create smooth, coordinated movement. When there is damage or dysfunction anywhere in this system—such as from a stroke, traumatic brain injury, Parkinson's disease, multiple sclerosis, cerebral palsy, or other neurological conditions—movement can become difficult to control.

Some people experience excessive, involuntary movements like shaking or muscle spasms, while others struggle with stiffness or slowness. These abnormal movement patterns can interfere with walking, speaking, eating, writing, and many other everyday activities. Understanding the different types of movement disorders is the first step toward finding effective treatment and rehabilitation strategies.

What Are the Types of Abnormal Movements?

Abnormal movements generally fall into two main categories:

• Hyperkinetic movements – excessive or unwanted movements, such as shaking, spasms, or jerking.
• Hypokinetic movements – reduced or slowed movements that make it difficult to initiate or complete tasks.

Hyperkinetic Movement Disorders

The word "hyperkinetic" means "too much movement." These disorders involve excessive muscle activity and may affect voluntary movements (those you choose to make) or cause involuntary movements that occur without your control.

Ataxia: 

Ataxia is a disorder of coordination that causes movements to appear unsteady, awkward, or clumsy. A person with ataxia may have difficulty walking, maintaining balance, reaching for objects, or speaking clearly. While ataxia can be a condition on its own, it is more commonly a symptom of an underlying neurological disorder or injury. 

Spasticity: 

Spasticity is a condition in which certain muscles become tight and overactive due to disrupted signals between the brain and muscles. The muscles affected may contract involuntarily, making movement difficult and sometimes painful. Spasticity can interfere with walking, using the hands, maintaining balance, and even speaking or swallowing. It is commonly seen after stroke, spinal cord injury, traumatic brain injury, multiple sclerosis, and cerebral palsy.

Tremor: 

A tremor is an involuntary, rhythmic shaking movement caused by repeated muscle contractions and relaxations. Tremors may affect the hands, arms, head, legs, voice, or other parts of the body. They can occur while a person is at rest or during movement and may range from barely noticeable to severe enough to interfere with daily activities such as eating, writing, or dressing.

Hypokinetic Movement Disorders

The term "hypokinetic" means "too little movement." These disorders are characterized by reduced speed and amplitude of movement and primarily affect voluntary actions.

Rigidity: 

Rigidity is a continuous state of muscle stiffness or involuntary muscle contraction that causes the muscles to feel tight and resistant to movement. Unlike temporary muscle soreness or spasms, rigidity affects the entire range of motion and remains consistent regardless of how quickly or slowly a limb is moved. This stiffness can make everyday activities more difficult and often contributes to discomfort and reduced mobility.

Bradykinesia: 

Bradykinesia refers to the slowness of movement and difficulty initiating or sustaining motion. People with bradykinesia may notice that simple tasks—such as buttoning a shirt, walking, or getting out of a chair—take much longer than they once did. Movements may gradually become smaller, slower, or interrupted by hesitations or pauses. Bradykinesia is one of the hallmark symptoms of Parkinson's disease. 

What Causes Abnormal Movements?

Abnormal movements occur when the communication pathways between the brain, spinal cord, nerves, and muscles are disrupted. Normally, these systems work together to produce smooth, coordinated, and purposeful movement. When injury or disease damages these pathways, the signals that control muscle activity become distorted, leading to movements that are either excessive (hyperkinetic) or reduced (hypokinetic).

Abnormal movement disorders can affect:

• Voluntary movement — actions you intentionally choose to make.
• Involuntary movement — movements that occur without conscious control, such as shaking, muscle spasms, or abnormal postures.

Several neurological conditions can interfere with these movement pathways.

Brain Injury: Different areas of the brain control different aspects of movement. Damage to these regions can produce distinct movement disorders.

• Basal Ganglia: The basal ganglia help regulate the speed, timing, and smoothness of movement. Injury or disease affecting this area can lead to:
• Tremors
• Chorea (sudden, jerky movements)
• Athetosis (slow, writhing movements)
• Bradykinesia (slowed movement)
• Cerebellum: The cerebellum coordinates balance, posture, and fine motor control. Damage to this area often causes ataxia, resulting in:
• Poor coordination
• Unsteady or staggering gait
• Difficulty judging distance and depth
• Problems with tasks such as reaching, writing, or buttoning clothes
• Motor Cortex and Descending Motor Pathways: The motor cortex sends commands that tell muscles when to contract and when to relax. Damage to these pathways can prevent muscles from relaxing properly, leading to:
• Spasticity: increased muscle tone and stiffness
• Dystonia: sustained muscle contractions that produce twisting movements or abnormal postures

Spinal Cord Injury: A spinal cord injury (SCI) disrupts communication between the brain and the body. One of the most common movement problems following SCI is spasticity.

Under normal circumstances, the brain sends inhibitory signals down the spinal cord to regulate reflexes and prevent muscles from overreacting. When the spinal cord is injured, these calming signals cannot reach the nerves below the injury. As a result:

• Local spinal reflex circuits become overly sensitive.
• Minor triggers, such as a light touch, tight clothing, changes in position, or even a full bladder, can activate these circuits.

• Muscles may suddenly tighten, jerk, or spasm without warning.

Multiple Sclerosis: Multiple sclerosis (MS) damages the myelin sheath, the protective covering around nerve fibers in the brain and spinal cord. This damage creates scar tissue, called lesions, that interfere with the transmission of nerve signals. Depending on where these lesions occur, people with MS may experience several types of abnormal movement:

• Tremor: Damage to the cerebellum can impair the brain's ability to coordinate movement, causing involuntary shaking that often becomes worse during purposeful activities.
• Spasticity and Muscle Spasms: Lesions affecting upper motor pathways reduce the brain's ability to control reflexes, leading to muscle stiffness, tightness, and sudden spasms.
• Ataxia: Damage to the cerebellum or sensory pathways can impair balance and body awareness, resulting in clumsy or unsteady movements.
• Paroxysmal Dyskinesias: Some individuals with MS experience brief episodes of involuntary twisting movements or abnormal postures, likely caused by abnormal electrical activity in damaged nerve pathways.

What Are Movement Disorders?

Movement disorders are neurological conditions that directly affect the brain's motor control systems. Two of the most common are Parkinson's disease and essential tremor.

Parkinson's Disease: Parkinson's disease develops when nerve cells in a region of the brain called the substantia nigra gradually stop producing enough dopamine, a chemical messenger essential for smooth, coordinated movement. As dopamine levels decline:

• The basal ganglia can no longer properly regulate movement.
• Communication between the brain and muscles becomes impaired.
• Movements become slower and more rigid.

The hallmark symptoms of Parkinson's disease include:

• Resting tremor
• Muscle rigidity
• Bradykinesia (slowness of movement)
• Balance and walking difficulties

Dyskinesia in Parkinson's Disease

Many people with advanced Parkinson's disease develop dyskinesia, characterized by involuntary, writhing, or fidgeting movements. Unlike the primary symptoms of Parkinson's, dyskinesia is usually a side effect of long-term treatment with levodopa and other dopamine-enhancing medications. Over time, repeated fluctuations in dopamine levels can make the brain's movement circuits overly sensitive, causing them to generate abnormal involuntary movements.

Medication-Induced Tardive Dyskinesia: Some medications, particularly long-term use of antipsychotics, certain anti-nausea drugs, and some antidepressants, can block dopamine receptors. In response, the brain may become overly sensitive to dopamine, resulting in repetitive, involuntary movements known as tardive dyskinesia. Common symptoms include:

• Lip smacking
• Tongue thrusting
• Facial grimacing
• Repetitive chewing motions
• Jerking or writhing movements of the arms, legs, or trunk

Essential Tremor

Essential tremor (ET) is one of the most common movement disorders and primarily affects the hands, although it can also involve the head, voice, or other body parts. Researchers believe ET results from abnormal communication within the cerebellum and its connections to other motor centers in the brain. Structural changes within the cerebellum may produce abnormal rhythmic electrical activity that causes muscles to contract and relax repeatedly. Unlike Parkinson's tremor, essential tremor typically occurs during movement, such as:

• Writing
• Eating
• Drinking from a cup

• Using tools or utensils

What About Apraxia?

Although apraxia affects movement, it is not considered a true movement disorder. Instead, it is a cognitive-motor disorder that affects the brain's ability to plan and carry out purposeful actions.

A person with apraxia has the strength and desire to perform a task but cannot correctly organize the sequence of movements needed to complete it. For example, they may struggle to use a toothbrush, wave goodbye, or button a shirt despite having normal muscle function.

Apraxia is most often caused by stroke, traumatic brain injury, or other neurological conditions that affect the brain's planning and motor programming centers.

How Are Abnormal Movements Treated?

The best treatment for abnormal movements depends on the underlying cause. Some conditions, such as Parkinson's disease or multiple sclerosis, require long-term management, while others may improve significantly with rehabilitation, medication, or surgery. In many cases, the most effective approach combines medical treatment with physical, occupational, and speech therapy to maximize function and independence.

Surgical Options for Abnormal Movements

When conservative treatments and medications are not enough to control symptoms, surgical interventions may be recommended.

• Selective Dorsal Rhizotomy (SDR): A specialized procedure that selectively cuts overactive sensory nerve fibers to reduce severe spasticity, primarily in the legs.
• Orthopedic Surgery: Tendon lengthening or muscle release procedures can improve positioning, reduce contractures, and increase mobility.
• Deep Brain Stimulation (DBS): Electrodes are surgically implanted into specific areas of the brain to regulate abnormal electrical signals, helping reduce severe tremors and other movement symptoms associated with Parkinson's disease and essential tremor.
• Intrathecal Baclofen Pump: A surgically implanted pump delivers baclofen directly into the spinal fluid, providing powerful relief for severe, widespread spasticity while minimizing medication side effects.

Medications for Abnormal Movements

Many movement disorders can be effectively managed with medication. Treatment is tailored to the individual's diagnosis and symptoms.

For Tremors

• Beta-blockers, such as propranolol, are commonly prescribed for essential tremor.
• Anti-seizure medications or tranquilizers may also help reduce shaking.
• Botulinum toxin (Botox) injections may be used for certain localized tremors.

For Ataxia

• Vitamin supplementation can improve ataxia caused by vitamin deficiencies, particularly Vitamin E deficiency.
• Antibiotics or antiviral medications may be prescribed when infections are the underlying cause.
• Acetazolamide is often effective for certain forms of episodic ataxia.

For Parkinson's Disease

• Levodopa/Carbidopa remains the gold standard treatment by replacing dopamine in the brain and improving slowness and stiffness.
• Dopamine agonists mimic dopamine's effects and help improve movement.
• MAO-B inhibitors and COMT inhibitors slow the breakdown of dopamine, extending the effectiveness of other medications.
• Amantadine may help reduce symptoms and can also treat medication-induced dyskinesia.

For Spasticity

• Oral muscle relaxants such as baclofen, tizanidine, dantrolene, and certain benzodiazepines help reduce muscle tightness and spasms.
• Botulinum toxin (Botox) or phenol injections temporarily block nerve signals to overactive muscles, creating a valuable window for rehabilitation therapy.

How Therapy Helps Abnormal Movements

Rehabilitation therapy is often one of the most important components of treatment. Physical, occupational, and speech therapy help people improve movement quality, reduce complications, and maintain independence.

Physical and Occupational Therapy: Therapists develop individualized treatment plans to improve strength, coordination, flexibility, balance, and daily function. Treatment may include:

• Gait and balance training to reduce fall risk and improve walking safety.
• Stretching and range-of-motion exercises to maintain flexibility and prevent contractures.
• Myofascial release and soft tissue techniques to reduce muscle tightness and improve mobility.
• Strengthening and weight-bearing exercises to improve stability, posture, and muscle control.
• Speed-based movement training to help retrain the brain for faster, more efficient movement patterns.
• Aerobic and resistance exercise programs that support brain health and may help slow functional decline.
• Splinting and bracing to position limbs properly and reduce abnormal muscle activity.
• Mobility equipment recommendations, including canes, walkers, wheelchairs, and other assistive devices.
• Adaptive strategies for activities of daily living, including dressing, bathing, cooking, and eating.
• Home modification recommendations to improve safety and accessibility.

Temperature Therapy: Heat and cold can help manage muscle tightness and discomfort.

• Warm baths, heating pads, or warm compresses before stretching can improve tissue flexibility.
• Ice packs may help reduce inflammation and temporarily decrease pain and muscle overactivity.
• Some individuals with tremor benefit from forearm cooling techniques, which may temporarily reduce shaking.

Speech and Swallowing Therapy: When abnormal movements affect the muscles used for speaking or swallowing, speech-language pathologists provide specialized treatment to:

• Improve speech clarity and voice quality.
• Strengthen oral and throat muscles.
• Teach compensatory strategies for safer swallowing.
• Reduce the risk of choking and aspiration pneumonia.

Lifestyle and Dietary Changes for Abnormal Movements

Healthy lifestyle habits can help reduce symptom severity and improve overall function.

• Stay well hydrated and maintain proper electrolyte balance.
• Limit or avoid caffeine and nicotine, which often worsen tremors.
• Manage stress through relaxation techniques, meditation, yoga, or breathing exercises, as anxiety can increase involuntary movements.
• Engage in regular physical activity to maintain mobility and overall health.
• Gentle massage or foam rolling may help reduce muscle tension and discomfort.

The Bottom Line

Abnormal movements such as spasticity, tremors, ataxia, rigidity, and bradykinesia can make everyday activities challenging, but they do not have to define your quality of life. Advances in medication, surgical treatments, and neurorehabilitation have made it possible for many people to improve their mobility, independence, and confidence.

At Therapy Achievements, our experienced neurorehabilitation team specializes in treating the complex movement problems associated with stroke, traumatic brain injury, Parkinson's disease, multiple sclerosis, spinal cord injury, cerebral palsy, and other neurological conditions. Our physical therapists, occupational therapists, and speech-language pathologists work together to create individualized treatment plans that address the whole person—not just the diagnosis.

Whether you are struggling with balance, muscle stiffness, tremors, coordination problems, speech difficulties, or swallowing issues, our team uses evidence-based techniques and specialized neurological rehabilitation programs to help you move better, function more independently, and get back to the activities that matter most to you.