Stroke is the most common cause of aphasia. Strokes are also known as cerebrovascular accidents (CVA). A stroke occurs when the blood supply to the brain is reduced or stopped. When this happens, the brain does not receive oxygen and nutrients, which damages the brain’s tissue.
Because the brain has many arteries that supply blood, a stroke typically only affects part of the brain. When blood flow to the brain’s language centers is stopped, aphasia can occur.