Deep dyslexia is a form of alexia that disrupts reading processes that were functioning normally before the individual suffered a head trauma to the dominant hemisphere (usually left). Deep dyslexia may occur as a result of a head injury, stroke, disease, or operation. This injury results in the occurrence of semantic errors during reading and the impairment of nonword reading.The term dyslexia comes from the Greek words ‘dys’ meaning ‘impaired’, and ‘lexis’ meaning ‘word’ and is used to describe disorders of language concerning reading and spelling.Numerous models and hypotheses have been proposed in attempt to explain the broad range of symptoms experienced by deep dyslexics, but a definite consensus has yet to be reached. The proposed models and hypotheses have helped in treatment of some suffering patients, but only with certain specific symptoms. Additionally, the recovery seen is not experienced equally in all patients.