Hereditary hearing loss is due to deafness gene and chromosome abnormality, the disease is by parents genetic material, including chromosome and is located in one of the genes changed and passed to offspring caused by, is the human most common sensory nervous system defects. Regardless of the parents of the unilateral or both the two sides are deaf patients or healthy carriers, deafness genes will be inherited through the parents to their children. The disease is inherited in the next generation through the autosomal recessive and mitochondrial inheritance. The identification of genetic mutations can prevent the birth defects of congenital deafness, control the risk of deafness, prevent or delay the occurrence and development of deafness.
2005 Spring Festival Gala, a 21 deaf performers by offering "Avalokitesvara" let too many people feel shocked and moved, the 21 performers, 18 is due to small when the injection of antibiotics caused deafness.
According to statistics, drug-induced deafness and congenital deafness accounted for more than 90% of deaf disability.