Many people (even some doctors) do not realize that deafness can be inherited. In China, congenital deafness accounts for about 50% of deaf children, and hereditary deafness accounts for 85% of congenital deafness, so it is clear that deafness is not only hereditary, but also has a high rate of inheritance. The majority of hereditary deafness is autosomal recessive, and 7% of hereditary deafness patients are the offspring of consanguineous families, so consanguineous marriage is an important factor in the complication of hereditary deafness. In addition, hereditary deafness also occurs more often in the offspring of intermarriages between people who have deafness, who produce carriers of the hereditary deafness gene. Scientists have found through research that deafness is inherited in a variety of ways, such as autosomal dominant, autosomal recessive, sex-linked, matrilineal, etc. It is speculated that there may be 400 genes associated with deafness, and dozens of genes have been cloned.