What Is It Called When You Can't Pronounce Words Correctly?
When you can't pronounce words correctly, it is usually called a speech sound disorder, the broad term for trouble producing speech sounds clearly. So, what is it called when you can't pronounce words correctly in your specific situation? That depends on the type, and each type is treated differently.
Speech sound disorders are a family of conditions, from articulation and phonological problems to motor speech disorders like dysarthria and apraxia. If you are an adult who mispronounces certain sounds, or you have noticed a sudden change in your speech, the sections here show what each pattern is called, what causes it, and how speech therapy helps. They also show when a change is a reason to see a doctor first.
Knowing the correct term matters because it points you to the right kind of help.
Key Takeaways
When you can't pronounce words correctly, the difficulty is most often a speech sound disorder. It covers several conditions that affect speech clarity.
Speech sound disorders include articulation and phonological problems, plus motor speech conditions like dysarthria and apraxia of speech. Aphasia is a separate language disorder.
A speech-language pathologist can diagnose the cause and treat it with targeted speech therapy. Speech therapy is the primary way speech sound disorders are treated, in both children and adults.
A sudden change in how you pronounce words needs a medical evaluation first. Slurred speech that comes on quickly can be a medical emergency.
What Is It Called When You Can't Pronounce Words Correctly?
Types of Speech Sound Disorders
What Causes Difficulty Pronouncing Words?
How Speech Therapy Helps You Speak More Clearly
What We See Working with Clients
What Is It Called When You Can't Pronounce Words Correctly?
When you can't pronounce words correctly, it is usually called a speech sound disorder. It is the broad term for trouble producing speech sounds. There are a few main types, shown in the table below.
| Type | What it affects | Common examples |
|---|---|---|
| Articulation disorder | Specific speech sounds | Rhotacism (/r/), lambdacism (/l/), a lisp (/s/, /z/) |
| Phonological disorder | Patterns of sounds | The same error across many words |
| Motor speech disorder | Muscles or motor planning | Dysarthria, apraxia of speech |
| Aphasia (separate) | Finding and using words | A language disorder, not sound production |
| Connected Speech Pathology | connectedspeechpathology.com | ||
Each label points to a different cause and a different path to clearer speech. A speech-language pathologist identifies the one that fits and builds the plan around it.
Types of Speech Sound Disorders
Speech sound disorder is a broad term for several conditions. Articulation and phonological disorders develop in childhood, affecting speech patterns in school-age children. Motor speech disorders can also begin in childhood, as in childhood apraxia of speech, or develop later in life after a neurological condition.
All of them affect how clearly a person produces or combines certain sounds, and untreated childhood patterns can continue into adulthood.
Articulation Disorders
An articulation disorder involves difficulty producing specific speech sounds accurately. The sound comes out distorted or is replaced with another sound, and the same error tends to appear wherever that sound occurs. Some errors have their own names.
Rhotacism is difficulty pronouncing the /r/ sound. Most children produce the /r/ sound correctly by age 6 or 7, and rhotacism can persist into adulthood if it is not treated.
Lambdacism is trouble producing the /l/ sound.
A lisp affects the /s/ and /z/ sounds, so words with those sounds are hard to say clearly.
These are the specific sound errors people often ask about by name. Our guide to articulation and phonological disorders explains how each is assessed and treated.
Phonological Disorders
A phonological disorder involves consistent sound errors that affect speech intelligibility. Instead of struggling with one sound, a person applies the same simplifying pattern across many words, like dropping the ends of words. The result is speech that is hard for others to follow, even though the person knows the words they want to say.
Phonological disorders are among the speech sound disorders most often associated with childhood development, though untreated patterns can carry into later life.
Motor Speech Disorders and How Aphasia Differs
Motor speech disorders affect the physical production of speech. The two main types are dysarthria and apraxia of speech. Both can make speech unclear, and they are treated in different ways.
Dysarthria is a motor speech disorder caused by muscle weakness, and it often follows a neurological condition such as a stroke. It produces slurred speech and changes in voice quality. Apraxia of speech affects the planning and coordination of speech movements, and it has two forms.
Acquired apraxia of speech develops after a stroke or brain injury, most often in adults. Childhood apraxia of speech is present from early development: the child knows what they want to say, but the brain has difficulty planning the movements needed to say it. A speech-language pathologist tells apraxia of speech and dysarthria apart during the evaluation.
Aphasia is different from all of the above. It is a language disorder, or language impairment, that affects finding and using words, so a person can struggle to retrieve the right words even when their speech muscles work normally. Speech therapy for apraxia of speech and related motor speech disorders focuses on rebuilding clear, coordinated speech.
What Causes Difficulty Pronouncing Words?
Trouble pronouncing words shows up as speech difficulties others notice. Difficulty pronouncing words usually has an identifiable cause, such as a developmental delay, hearing loss, or a neurological condition. Knowing the cause matters because it determines the treatment.
Common Signs of Speech Difficulties in Adults
The signs of a speech disorder are patterns other people notice in everyday conversations, and they affect adults as much as children. More than one can appear together, and other signs depend on the underlying cause.
Unclear or slurred speech that makes certain words hard to understand
Frequent mumbling that affects how clearly speech comes across
Stuttering, a common symptom of fluency disorders
Inconsistent errors, where the same word is said differently from one moment to the next
Being asked to repeat yourself often, or feeling that people do not follow what you say
These speech issues can affect more than clarity. Communication gaps can lead to unintelligible speech, and the emotional effects can include embarrassment, low self-esteem, or social isolation. Naming the problem is often the first step, and speech therapy can boost confidence in social interactions.
Common Causes and Risk Factors
No single cause explains every speech sound disorder, and several risk factors often overlap. The main causes fall into a few groups.
Developmental delays and developmental disorders, which can slow speech skill development in childhood
Hearing loss, which can blur the speech sounds a person hears and stores
Neurological disorders, such as stroke, traumatic brain injury, and multiple sclerosis, which affect speech production
Genetic and family history factors, which raise the likelihood of speech problems
Structural differences, such as cleft palate or tongue tie, along with environmental factors during early development
Sometimes the cause is unknown
Sudden changes in speech are handled differently from a lifelong pattern. In particular, sudden speech difficulties with a severe headache, weakness, or confusion can signal a stroke and are a medical emergency. Seek a medical evaluation first, before any speech therapy, so a doctor can rule out a neurological cause.
How Speech Therapy Helps You Speak More Clearly
Speech therapy is the primary treatment for speech sound disorders in both children and adults. A speech-language pathologist matches specific exercises to the diagnosis, so treatment for an articulation error looks different from treatment for apraxia of speech.
How a Speech-Language Pathologist Reaches a Diagnosis
Diagnosis begins with a speech-language pathologist who reviews your medical history, checks your speech and language, and listens closely to how specific sounds are produced. The evaluation often includes standardized tests and an assessment of how the muscles for speech are working. If hearing loss is a possible cause, an audiologist tests your hearing. The results identify the disorder and determine the speech therapy plan.
How Speech Therapy Improves Pronunciation
Speech therapy is matched to the type of disorder rather than applied the same way to everyone. Most treatment plans use a few main approaches:
Articulation therapy targets specific sound errors through practice with mouth and tongue placement.
Phonological therapy addresses whole patterns of sound errors rather than one sound at a time.
Motor speech therapy improves the planning and coordination for speech in dysarthria and apraxia.
Assistive technology can enhance communication for some people when speech alone is not enough.
These are general options, and the professional who evaluates you is best placed to pick the ones that fit, since not every exercise suits every situation. Consistent practice between sessions supports progress.
You can read more about what targeted exercises and strategies a speech therapist uses with adults.
Articulation Disorder in Adults
Find out more about articulation disorders in adults in this blog.
What We See Working with Clients
In our practice, we work with adults who want to be understood more easily in everyday conversations.
The examples below are real clients of ours. Identifying details have been changed to protect privacy.
One adult came to us with a lifelong /r/ difficulty, a form of rhotacism that had stayed with him since childhood. He avoided saying his own name in meetings and had started to speak less at work.
We used articulation therapy focused on tongue placement for the /r/ sound, with short daily practice between sessions. His /r/ became clearer over several months, and he told us he speaks up more often now.
Another adult developed slurred speech after a neurological condition affected the muscles she uses to talk, a pattern consistent with dysarthria. Her family often asked her to repeat herself, which left her frustrated.
Her sessions used motor speech therapy to strengthen and coordinate those muscles, along with pacing strategies to make her speech easier to follow. Over time, her clarity improved, and conversations at home felt less effortful.
Frequently Asked Questions About Speech Sound Disorders
1. What is the difference between an articulation disorder and a phonological disorder?
An articulation disorder affects how specific sounds are produced. A single sound like /r/ comes out wrong or distorted. A phonological disorder affects sound patterns, so the same type of error shows up across many words, and a speech-language pathologist can tell the two apart.
2. Why am I suddenly mispronouncing words?
A sudden change can signal a neurological event, such as a stroke. Watch for slurred speech, weakness, or confusion, which make it a medical emergency. Seek a medical evaluation right away, and speech therapy begins once a doctor has ruled out a physical cause.
3. What is the difference between dysarthria and apraxia of speech?
Dysarthria comes from muscle weakness, so speech sounds slurred or slow. Apraxia of speech comes from a breakdown in planning speech movements, so the mouth cannot carry out the intended sounds. Both are motor speech disorders that a speech therapist can treat.
4. Is aphasia the same as not being able to pronounce words?
No. Aphasia is a language disorder that affects finding and using words, not the physical act of pronouncing sounds. Someone with aphasia often knows what they want to say and still struggles to retrieve the words.
5. Can adults improve pronunciation with speech therapy?
Yes. Speech therapy helps adults with articulation, phonological, and motor speech disorders speak more clearly. Progress depends on the cause and on consistent practice, and online speech therapy works well for many adults.
How Connected Speech Pathology Can Help
At Connected Speech Pathology, our speech-language pathologists provide online speech therapy for adults who want to improve communication skills and pronounce words more clearly. We assess how your sounds are produced, identify what is getting in the way, and build a personalized treatment plan around it.
What sets our approach apart is that every plan is tailored to your specific speech patterns and goals. Sessions run one-to-one over video, so you practice articulation therapy and other targeted exercises where you talk day-to-day.
Every person on our team is a licensed speech-language pathologist. Clear speech is the goal, and we track your progress toward it at each step.
Summary
What is it called when you can't pronounce words correctly? In most cases, it is a speech sound disorder. The group covers articulation and phonological problems, along with motor speech conditions like dysarthria and apraxia of speech.
Aphasia is a separate language disorder that affects words rather than sounds. A speech-language pathologist can identify the specific disorder and treat it with speech therapy. If your speech changes suddenly, seek a medical evaluation first, then ask about speech therapy to improve clarity.
About the Author
Allison Geller, M.A., CCC-SLP, is a communication coach, speech-language pathologist, and founder of Connected Speech Pathology, an international online practice providing professional communication coaching and speech therapy for children, teens, and adults. With more than two decades of experience, she has worked in medical and educational settings and published research on aphasia. Today, she leads a team of specialists who help clients improve their skills in public speaking, vocal presence, accent clarity, articulation, language, fluency, and interpersonal communication.
