Aphasic designates a person with aphasia. This is a language disorder which prevents the person either from expressing himself correctly or from writing or understanding words properly, if not both. Certain aphasics cannot find their words. Others are completely mute. The aphasic person loses his/her capacity to communicate following certain lesions, like tumors, strokes, or degenerative neurological diseases, like Alzheimer's, or a cranial trauma. The situation can improve thanks to speech therapy; it can also remain stable or get worse, in the most severe cases.