Speech Therapy For Slurred Speech: A Guide To Managing Dysarthria

Are you or someone you love experiencing slurred speech?

It’s natural to wonder what might be behind it — but the answer isn’t always simple.

Slurred speech is clinically known as dysarthria, and it can stem from a variety of underlying causes.

In some cases, it’s temporary.

For example, you might notice that your speech sounds less clear when you’re feeling extremely tired.

That’s often due to muscle fatigue around the mouth, which can affect how efficiently those muscles work.

The good news is that fatigue-related dysarthria usually improves with rest.

But what about other causes?

Is it a reason to be concerned if slurred speech comes on suddenly?

In this article, we’ll explore what dysarthria is, what might be causing it, and how speech therapy can help you or your loved one manage its symptoms effectively.

What Is Dysarthria?

Dysarthria refers to a motor speech disorder that happens when the muscles you use for speaking become weak, move too slowly, or have difficulty coordinating.

Dysarthria can look different for everyone.

For some people, it affects their clarity or intelligibility.

For others, it affects their rate of speech or volume.

Dysarthria can also vary in severity.

For some, it may be barely noticeable.

For others, it may impact their ability to be understood by others.

What Is Slurred Speech A Sign Of?

Slurred speech is a common characteristic of a variety of medical conditions.

Speech therapists play an important role in assessing and describing the specific characteristics of your speech.

This information can help healthcare providers better understand the underlying cause of dysarthria and support an accurate diagnosis.

Once the cause is identified, speech therapy can provide individualized strategies and exercises to help improve clarity, strengthen communication, and support confidence in everyday interactions.

Let’s take a closer look at some of the most common causes of dysarthria.

1. Parkinson’s Disease

Parkinson’s disease is a neurological disorder that causes the gradual loss of certain nerve cells (neurons) in the brain.

This loss leads to decreased levels of dopamine — a chemical you might recognize as part of the brain’s “reward center.”

But dopamine does more than affect mood. It also plays a key role in coordinating smooth, controlled muscle movement.

As dopamine levels drop, people with Parkinson’s may experience muscle rigidity, tremors, and decreased motor control — including in the muscles used for speech.

This can lead to softer, slurred, or monotone speech — all common communication changes seen in Parkinson’s disease.

Because Parkinson’s is a progressive disorder, these symptoms tend to change and worsen over time.

Other common characteristics may include:

• Bradykinesia (slowed movements)
• Shakes or tremors
• Muscle stiffness
• Breathy voice
• Quieter voice
• Flat pitched voice (monotone)
• Differences in balance control
• Anosmia (loss of smell)
• Differences in posture
• Depression and anxiety

While there is currently no known cure for Parkinson’s disease, many therapeutic options are available to help manage symptoms and improve quality of life.

In particular, speech therapy for Parkinson’s disease can be highly effective in addressing communication and swallowing challenges.

Speech therapists work with individuals to strengthen the muscles used for speech, improve vocal projection, and develop strategies to make everyday communication more successful.

When needed, they can also introduce augmentative and alternative communication (AAC) tools to support clearer interactions at home, work, or in social settings.

2. Multiple Sclerosis

Multiple sclerosis is a neurological disorder and autoimmune disease that affects the central nervous system.

This occurs when the immune system mistakes healthy tissue for a pathogen and attacks it.

In the case of multiple sclerosis, your immune system damages the myelin sheath.

The myelin sheath protects nerve fibers in the brain and spinal cord and helps electrical signals travel efficiently

As multiple sclerosis progresses, it can affect your ability to coordinate your muscles, including those used for speech.

As a result, it’s a possible cause of dysarthria.

Other common symptoms of multiple sclerosis include:

• Nerve numbness or tingling
• Muscle weakness
• Changes in muscle coordination
• Changes in balance
• Vision problems, such as blurred vision or double vision
• Vertigo
• Chronic fatigue
• Differences in memory
• Mood changes, such as anxiety or irritability

Speech therapy can help individuals with multiple sclerosis manage dysarthria and other common communication challenges associated with the condition.

3. Cerebral Palsy

Cerebral palsy is a neurological disorder that refers to a group of conditions affecting movement, posture, and muscle coordination.

It’s caused by an injury to the developing brain.

This typically occurs in the womb, during birth, or shortly after

The signs of cerebral palsy may vary depending on the specific type and location of the brain damage.

Because cerebral palsy can affect speech, differences in speech muscle control are common among individuals with the condition.

Some may speak with only mildly reduced intelligibility.

Others may be nonspeaking in some or all situations.

Other common signs of cerebral palsy include:

• Speech and language developmental delays
• Dysphagia (difficulty swallowing)
• Frequent or excessive drooling
• Intellectual disability
• Hoarse voice
• Monotone voice
• Breathy voice
• Muscle spasms or tremors
• Low or stiff muscle tone
• Muscle rigidity
• Challenges in balance and coordination
• Toe walking or other gait differences
• Fine motor skill delays
• Seizures
• Growth delays
• Bowel or bladder incontinence
• Mental health diagnoses

Speech therapy for cerebral palsy is all about meeting your child where they are.

Because symptoms can vary so widely, speech therapists create individualized plans that build on your child’s strengths and support their specific needs.

The goal is to help them communicate with confidence — at home, in school, and beyond.

4. Autism Spectrum

The autism spectrum is a neurodevelopmental disorder.

That may sound complex, but it just means it’s a difference in how the brain develops and processes information.

In particular, autistic people often experience unique patterns in communication, social interaction, and behavior.

Examples include:

• Repetitive speech (echolalia) and movements, such as hand flapping or spinning
• Focused or intense interests
• Strong preference for routine and predictability
• Differences in understanding unspoken forms of communication, such as facial expressions
• Differences in emotional expression
• Differences in social interaction
• Speaking in a monotone voice
• Gestalt language processing

Additionally, some autistic children may experience differences in motor development — including gross motor skills, fine motor skills, and oral motor skills.

These differences can sometimes contribute to challenges with speech clarity, such as dysarthria.

Speech therapy for autism can support communication in a variety of ways.

For some children, this may include learning to use augmentative and alternative communication (AAC) tools or strategies.

Therapy approaches that affirm neurodiversity aim to help autistic children express their thoughts, feelings, and needs in ways that feel clear, authentic, and empowering.

Parents and caregivers may also benefit from additional strategies to support communication at home — including aided language stimulation for kids who use AAC.

5. Stroke

Some instances of dysarthria may hint at a more serious cause.

For instance, many people experience sudden changes in speech clarity during a stroke.

Thus, it’s critically important to get to your nearest emergency room if you or a loved one develops a sudden onset of dysarthria.

Strokes are a life-threatening medical emergency that occurs when blood flow to the brain is blocked or when there’s bleeding in your brain.

In addition to dysarthria, other potential warning signs of stroke include:

• Mixed expressive and receptive language disorder, or expressive/receptive language disorders on their own
• Numbness or weakness on one side of the body
• Blurred or loss of vision
• A severe headache
• Vomiting or dizziness
• Sudden changes in balance or coordination

People recovering from a stroke also commonly experience speech and language changes, including dysarthria and aphasia.

In these instances, post-stroke speech therapy can help you continue to communicate your thoughts, wants, and needs.

6. ALS (Lou Gehrig’s Disease)

Amyotrophic lateral sclerosis (ALS) is a progressive neurological disease.

It causes a slow breakdown of nerve cells that control voluntary muscles.

This leads to muscle weakness and loss of muscle coordination.

Since it’s a progressive condition, symptoms often start as subtle changes before gradually progressing.

For instance, people in the early stages of ALS may notice mild changes in speech clarity.

As it progresses, you may notice more significant communication challenges.

Other signs of ALS may include:

• General muscle weakness
• Changes in walking ability
• Clumsiness
• Dysphagia (difficulty swallowing)
• Muscle cramps
• Muscle twitching
• Cognitive or behavioral changes, such as mood or decision-making differences
• Unexplained crying, laughing, or yawning

There is currently no known cure for ALS

However, a speech therapist can work with you to help support communication and maintain quality of life.

7. Down Syndrome

Down syndrome is a naturally occurring genetic variation that involves an extra copy of chromosome 21.

Down syndrome is present at birth, and is a lifelong condition.

It can influence speech and language development in a number of different ways.

In particular, people with Down syndrome often have differences in oral structure and muscle tone.

This includes a larger than average tongue in proportion to their mouth.

This may contribute to speech clarity issues, including dysarthria.

As well, people with Down syndrome are more likely to have some degree of hearing loss.

Hearing loss can affect speech and language development and access to communication.

If you’ve recently had a child with Down syndrome, you may not know where to start.

Fortunately, many cities offer a range of resources for parents of children with Down syndrome.

But the most important thing to know is with the right supports, your child can live a healthy, happy, and fulfilling life.

Among the many available supports, speech therapy for Down syndrome focuses on developing effective communication skills tailored to each child’s needs.

For instance, in addition to supporting speech clarity and reducing the impact of dysarthria, speech therapists can also help with feeding and swallowing differences.

If helpful, speech therapists can also teach augmentative and alternative forms of communication and support your family in accessing an IEP for your child.

8. Other Possible Causes

Dysarthria is associated with a number of other conditions and situations.

There are too many to look at in depth, but some of the others include:

• Alcohol intoxication
• Certain medications, such as carbamazepine (anti-seizure medication) or lithium
• Severe emotional distress or fatigue
• Mouth or throat injuries
• Brain infections (such as encephalitis or meningitis)
• Bell’s palsy
• Brain tumors
• Traumatic brain injuries
• Guillain-Barre syndrome
• Huntington’s disease
• Lyme disease
• Muscular dystrophy
• Myasthenia gravis
• Wilson’s disease

What To Do If You Or Someone You Know Has Slurred Speech?

If you or someone you know is experiencing slurred speech suddenly, seek emergency medical care right away.

A sudden onset of slurred speech may indicate a serious medical emergency, such as a stroke.

Once you’ve ruled out an emergency, consider reaching out to your local speech therapy clinic.

At your first appointment, your speech therapist will conduct an evaluation to help determine the nature of your dysarthria.

They’ll also look for any other communication or swallowing changes you may have.

From there, they’ll put together an individualized treatment plan that focuses on your communication goals, as well as your unique needs.

The goal is to help you continue to communicate with those around you in a way that feels effective, clear, and confident.

Book Your Appointment With Our Speech Therapy Clinic Today

Slurred speech can be confusing, frustrating, or even alarming — especially when it comes on suddenly or begins to impact daily life.

But you don’t have to navigate it alone.

At Forte Speech & Language Therapy, our experienced team of speech-language pathologists provides thoughtful, personalized care for individuals experiencing dysarthria.

We’ll take the time to understand the root of your speech changes, tailor a treatment plan to your unique needs, and help you rebuild confidence in your ability to communicate.

Whether your symptoms are new or longstanding, mild or more severe, we’re here to help you speak with clarity and ease.

Book your appointment with Forte Speech & Language Therapy today and take the first step toward clearer, more confident communication.