Aphasia is a condition that you lose your ability to communicate. Your verbal and written communication abilities will be affected, even your ability to understand language.
Where and how bad the brain damage by an injury or a disease is and what caused it determine the degree of disability.
A stroke is the most common cause of aphasia. Stroke damages brain by blocking and rupturing a blood vessel in the brain which results in the loss of blood to the brain. The brain cell that control language will be damaged or die due to this.
A severe head injury, a tumor, an infection, some disease, or a degenerative process can cause aphasia. In such cases, cognitive problems, such as memory problems or confusion may occur.
Temporary episodes of aphasia can occur due to migraines, seizures or a transient ischemic attack (TIA).