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Communication is one of the most important ways people connect with others, share needs and participate in daily life. When speech changes suddenly or becomes difficult, it can be frightening for the person affected and their loved ones.
Two conditions that can affect communication are aphasia and dysarthria. “While the terms are sometimes used interchangeably, they describe different problems,” said Ryan Lang, M.Ed., CCC-SLP, Speech Language Pathologist at Inspira Health. “Aphasia affects language, while dysarthria affects the muscles used to speak.”
Understanding the difference can help people recognize symptoms, seek timely care and support recovery.
What is Aphasia?
Aphasia is a language disorder that happens when areas of the brain responsible for language are damaged. A person with aphasia may know what they want to say but have trouble finding the right words. Others may speak fluently but use words that do not make sense or have difficulty understanding what people are saying to them.
Aphasia can also affect reading and writing. A person with aphasia may struggle to read a menu, write a text message or follow a conversation. The condition does not mean someone is less intelligent. It means the brain is having difficulty processing or expressing language.
What is Dysarthria?
Dysarthria is a motor speech disorder. It happens when the muscles used for speech are weak, slow or difficult to control. These muscles include those in the lips, tongue, voice box and diaphragm.
People with dysarthria usually understand language and know what they want to say, but their speech may sound slurred, soft, slow, strained, hoarse or mumbled. In some cases, speech may be difficult for others to understand, especially in noisy environments or during long conversations.
The difference between aphasia and dysarthria is that aphasia affects the message, while dysarthria affects the delivery. With aphasia, a person may have trouble choosing, understanding or organizing words. With dysarthria, the words and meaning are usually intact, but the body has trouble producing clear speech.
What Causes Aphasia and Dysarthria?
“Aphasia and dysarthria can occur after a stroke, traumatic brain injury, brain tumor or infection affecting the brain,” said Juanita Aviles Childers, MS, CCC-SLP, Speech Language Pathologist at Inspira Health. “Dysarthria can also be linked to neurological conditions such as Parkinson’s disease, multiple sclerosis (MS), amyotrophic lateral sclerosis (ALS), cerebral palsy or facial paralysis.”
Because these conditions can have serious causes, any new or sudden changes in communication shouldn’t be ignored.
When to Seek Care
A medical evaluation can help determine what is causing the change in communication. A physician may recommend imaging, neurological testing or a referral to a speech-language pathologist (SLP). SLPs are trained to evaluate speech, language, voice, swallowing and communication skills.
Treatment depends on the underlying cause and the person’s symptoms. “For aphasia, therapy may focus on rebuilding language skills, practicing conversation, using gestures or writing and helping loved ones communicate more effectively,” said Lang. “For dysarthria, therapy may include exercises to strengthen speech muscles, strategies to slow speech, breath support techniques or tools to improve communication.”
In some cases, recovery can take time. Progress may depend on the cause, severity of symptoms, overall health and how soon therapy begins. Support from family, friends and caregivers can make a meaningful difference.
Seek immediate medical attention if speech problems come on suddenly, especially if they occur with facial drooping, weakness on one side of the body, confusion, vision changes, dizziness or severe headache. These may be signs of a stroke or another medical emergency.
Speech and language changes can feel isolating, but help is available. With proper diagnosis, therapy and support, many people with aphasia or dysarthria can improve communication and maintain meaningful connections with the people around them.
