Aphasia Causes, Characteristics, and Resources

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Aphasia is an acquired communication disorder that impairs a person’s ability to use or understand language. It results from damage to portions of the brain (usually in the left hemisphere) that are responsible for language. The disorder impairs the expression and understanding of language as well as reading and writing.


There are many types of aphasia, depending on the location of the lesion in the brain.  It is classified in two general categories: fluent and nonfluent. Individuals who have fluent aphasia, also known as receptive aphasia, are able to physically hear words and see print but can’t make sense of the words.  Fluent aphasia is further broken down into Wernicke’s, Conduction, Transcortical Sensory, and Anomic. Individuals who have nonfluent aphasia, also known as expressive aphasia, have difficulty saying or writing what they mean, although they know what they want to say. This category can be further broken down into Broca’s, Transcortical Motor, and Global. Types of non-fluent and fluent aphasia are further characterized by their ability to understand what is said, and their ability to repeat sentences. Individuals with anomia are able to understand what is said and repeat sentences, but they have trouble using the correct word. Global aphasia is the most severe, and is characterized by having severe impairments in all language functions. The following chart further describes aphasia types according to abilities. Good language comprehension Difficulty understanding language Able to repeat sentences Difficulty repeating sentences


Characteristics vary depending on the type of aphasia. The severity depends on the extent of the area of the brain affected. A person with aphasia may:

  • Have slow, effortful speech
  • Speak in short or incomplete sentences and omit small words (i.e “is”, “and”, “the”)
  • Have difficulty naming common objects
  • Speak in sentences that don’t make sense
  • Have difficulty writing and spelling
  • Have difficulty reading
  • Not comprehend other people’s conversation
  • Interpret figurative language literally
  • Write sentences that don’t make sense
  • Be unable to recite what has been said, or repeat sentences/words
  • Have difficulty pronouncing words
  • Not speak spontaneously
  • Have difficulty answering questions or following directions
  • Use nonsense words and not realize that they don’t make sense

Individuals with this disorder may also have physical difficulties related to the lesion in the brain.


  • Stroke (most common: about 25-40% of stroke survivors acquire aphasia)
  • Head injury
  • Brain tumor
  • Infection
  • Dementia
  • Other neurological causes (i.e Alzheimer’s, Parkinsons)
  • Temporary episodes of aphasia may occur from epilepsy, migraine, or transient ischemic attack (TIA)

Diagnosing this disorder:

If a person is suspected of having aphasia, their doctor will often refer them to have an imaging test to identify the cause. The person is then referred to a speech-language pathologist, who performs a comprehensive examination of the person’s communication abilities.


Books for kids:

  • Josh’s Road to Recovery by Kayla Hodgso
  • Nana’s Stroke by Barbara Baird

Books for Parents:

  • The Aphasia Handbook: A Guide for Stroke and Brain Injury Survivors and Their Families by Martha Taylor Sarno, MA, MD and Joan F. Peters, Eq.
  • Conquering Stroke  by Valerie Greene
  • More books available on aphasia.org (http://www.aphasia.org/naa_materials/books_cds_etc.html#children)

 Support Groups:


Informacion en español:


Aphasia (2008, October). The National Institute on Deafness and Other Communication Disorders (NIDCD) NIH Pub. No. 97-4257

Aphasia (2012, May 8). Mayo Foundation for Medical Education and Research (MFMER).

Brookshire, R.H. (2003). Introduction to Neurogenic Communication Disorders.

Do you have more great resources for families or community members?  We would be happy to add any great resources to this webpage.  Please email us with the link or content.

Also check out: Agenesis of the Corpus Callosum (ACC) Speech Implications and Resources

Are you in the Austin Texas Area and looking for Speech Therapy for Aphasia?

If you are looking for Speech Therapy in Austin Texas for Aphasia, we are here to help.  Contact our clinicians by visiting our Speech Therapy Austin Clinic Page and give us a call or send us a message.  

We look forward to serving you.

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