Aphasia is a neurologic condition in which an individual loses the ability to produce and/or understand spoken, written, or symbolic forms of communication.
Aphasia may follow a stroke, concussion, prolonged hypoxia, or heart disease. Sometimes the condition is partial (dysphasia), and the person retains some ability to communicate and to understand communication.
Aphasia may be temporary, as when the swelling in the brain goes down following a stroke. Intensive speech therapy is often successful in helping to restore the language function.