Intelligence and cognition are not affected by aphasia. Because of the damage to the left hemisphere of the brain, many people with aphasia also have weakness on the right side of the body. Writing ability can be impacted by any associated weakness or paralysis in the hand and arm.
Aphasia can improve with time and therapy. Working with a speech-language pathologist can help someone with aphasia make as much improvement as possible. Many people see significant improvement following the stroke or brain injury, and improvement can continue for years, especially with ongoing therapy and practice.