Dyslexia, also referred to as analysing sickness, is characterized by problem with reading despite normal intelligence. Different human beings are affected to various degrees. Problems may encompass problems in spelling words, analysing quickly, writing words, sounding out words in the head, announcing words when reading aloud and know-how what one reads. Often those problems are first observed at school. When a person who formerly could read loses their ability, it is called alexia. The problems are involuntary and people with this disease have a normal desire to learn.