Will speech be affected after a stroke? 

Speech and communication are frequently affected after a stroke, occurring in approximately one third of all survivors. When a stroke happens, it can damage the specific areas of the brain responsible for processing language or the nerves that control the muscles used for speaking. The impact on speech depends entirely on where the stroke occurred and how severe the damage is. For most people, communication difficulties are most profound in the immediate days following the event, but with intensive rehabilitation, many survivors see significant improvements as the brain begins to find new ways to process information. 

In a clinical setting, speech difficulties are categorized into different types based on whether the problem is with language processing or the physical act of speaking. This distinction is vital for determining the correct rehabilitation path. While the sudden loss of speech can be one of the most distressing symptoms of a stroke, modern speech and language therapy uses evidence based techniques to help patients rebuild their communication skills. Early intervention is the key to success, as the brain is most adaptable and receptive to relearning during the first few months of recovery. 

What we will discuss in this article 

• Understanding aphasia and how it affects language processing 

• The impact of dysarthria on the physical muscles of speech 

• How apraxia affects the planning of speech movements 

• The role of the left hemisphere in communication 

• How speech and language therapy supports long term recovery 

• Tips for communicating with a stroke survivor 

• Emergency guidance for identifying sudden speech changes 

Types of speech and language disorders 

Doctors and therapists identify several distinct conditions that can affect communication after a stroke. 

Aphasia 

Aphasia is perhaps the most common communication disorder following a stroke. It occurs when the language centres of the brain, usually in the left hemisphere, are damaged. Aphasia does not affect intelligence; rather, it affects the ability to access and use language. There are two main types: 

• Receptive Aphasia: The person has difficulty understanding what others are saying or reading. 

• Expressive Aphasia: The person knows what they want to say but struggles to find the right words or put them into sentences. 

Dysarthria 

Dysarthria is a physical problem rather than a language problem. It happens when the stroke damages the parts of the brain that control the muscles in the face, mouth, and throat. This can result in speech that sounds slurred, slow, or quiet. While the person can still think of the correct words and understand others perfectly, the muscles simply do not move correctly to produce clear sounds. 

Apraxia of speech 

Apraxia is a coordination disorder where the brain struggles to send the correct signals to the muscles to plan the sequence of movements needed for speech. A person with apraxia might struggle to make the right mouth shapes to say a word, even though their muscles are strong enough to do so. This often results in inconsistent speech errors. 

Why the location of the stroke matters 

The brain is divided into two hemispheres, each responsible for different functions. In about ninety five percent of right handed people and seventy percent of left handed people, the language centres are located in the left hemisphere. Therefore, a stroke on the left side of the brain is far more likely to cause significant aphasia. A stroke on the right side of the brain may not affect the ability to find words, but it can affect the social aspects of communication, such as understanding jokes, sarcasm, or the tone of a person voice. 

Comparison: Aphasia versus Dysarthria 

Feature	Aphasia	Dysarthria
Primary Problem	Language processing	Muscle control
Brain Region	Language centres	Motor cortex or nerves
Understanding	May be impaired	Usually perfectly intact
Word Finding	Difficult	Words known but slurred
Writing	Often affected	Usually unaffected
Therapy Focus	Relearning language	Muscle coordination

Rehabilitation and recovery of speech 

The primary treatment for communication issues after a stroke is speech and language therapy. 

The role of the therapist 

Speech and language therapists work with stroke survivors to create a tailored plan. This may include exercises to improve muscle strength, techniques to find alternative words, or the use of communication aids like picture boards and digital tablets. Therapy is most effective when it is intensive and involves repetitive practice, which helps the brain utilize neuroplasticity to create new pathways for communication. 

Supporting a survivor 

Communication is a two way process. When speaking with someone who has post stroke speech issues: 

• Give them time: Do not rush them or finish their sentences. 

• Reduce background noise: Turn off the television or radio to help them focus. 

• Use short sentences: Keep your communication simple and direct without talking down to them. 

• Use visual cues: Gestures, drawing, or pointing can help bridge the gap when words are missing. 

To Summarise 

Speech is frequently affected after a stroke, manifesting as either a processing issue like aphasia or a physical issue like dysarthria. While the loss of communication can be frustrating and isolating, it does not reflect a loss of intelligence. Through intensive speech and language therapy and the power of neuroplasticity, many survivors are able to regain significant communication abilities over time. Understanding the type of speech disorder and providing a supportive, patient environment are the most important factors in a successful recovery journey. 

Emergency guidance 

Sudden changes in speech are one of the most critical warning signs of a stroke. If you notice someone has slurred speech, is using the wrong words, or is unable to speak at all, call 999 immediately. Use the FAST test: Face is it drooping, Arms can they raise both, Speech is it slurred or strange, and Time it is time to call emergency services. Rapid medical intervention can restore blood flow to the language centres of the brain and may prevent permanent speech loss. 

Authority Snapshot 

This article was reviewed by Dr. Stefan Petrov, a physician with an MBBS and postgraduate certifications including Basic Life Support BLS, Advanced Cardiac Life Support ACLS, and the Medical Licensing Assessment PLAB 1 and 2. He has hands on experience in general medicine, surgery, anaesthesia, ophthalmology, and emergency care. Dr. Petrov has worked in both hospital wards and intensive care units, performing diagnostic and therapeutic procedures, and has contributed to medical education by creating patient focused health content and teaching clinical skills to junior doctors in 2026.