Because the causes of deafness are very complex, genetic testing technology cannot find the cause for all hearing impaired patients, and about 50% of the patients obtained negative results after genetic testing.

Genetics is an important cause of hearing impairment in children, and plays an important role in the factors that cause deafness in children. Hereditary hearing impairment can be divided into syndromic hearing impairment (SHI) and non-syndromic hearing impairment (NSHI) according to different phenotypes, and the proportion of non-syndromic hereditary hearing impairment is as high as 70%.

Hearing impaired children receive the maximum benefit before receiving intervention before 6 months of age