Two hundred one pupils from the Belgrade school for children with impaired hearing possess two somatic genetic markers of the tongue: fissured tongue and deep line in the tongue. After compairing these findings with those in healthy population, we found that these markers were three times more frequent in this group. This finding is of great statistical importance. Lingua geografica, the third somatic genetic marker of the tongue, was completely normal. After having carried out numerous detailed analyses of obtained data, we came to the conclusion that the relationship between the two genetic markers of the tongue and impairment of hearing, caused by congenital or early post-natal impairment was genetically various and very important from the medical point of view. In fact, if a person has a fissured tongue or a deep line in the tongue, he/she is at the risk of having his hearing apparatus impaired. This may happen during intrauterine of early post-natal period, and can be caused by biological, chemical or physical factors.