The causes of deafness are generally categorized into two types, congenital and acquired. Some congenital deafness may be hereditary, while acquired deafness is generally not hereditary. Congenital deafness is also usually divided into two cases. One case is hereditary, if both parents are normal but both carry the gene for deafness, they may give birth to a deaf child, and if only one of them carries the gene for deafness, the child may be normal but carry the gene for deafness. Another situation is congenital deafness caused by factors such as viral infection of the mother or the use of ototoxic drugs, which is prevention-oriented and is usually not hereditary. In addition, deafness caused by acquired factors such as ear trauma and the use of ototoxic drugs such as streptomycin is generally not hereditary. It is recommended that relevant genetic tests be conducted during pregnancy for timely prevention and eugenics, and if the child is born deaf, timely consultation and early intervention should be made.