According to the National Aphasia Association, aphasia is an impairment of language, affecting the production or comprehension of speech and the ability to read or write. Aphasia is always due to injury to the brain-most commonly from stroke.
The severity of symptoms will vary across individuals. Sometimes aphasia is mild, causing difficulty in the retrieval of names of objects. For others aphasia is severe, and results in the need to use alternative means of expressing oneself. Working with a speech-language pathologist is important to identify effective communication techniques and strategies.
To learn more about the different types of aphasia, watch this video