1. Trauma: Children should be tested for hearing loss after trauma. 2. Infection: Deafness caused by infection is mainly caused by mumps, which is common between the ages of 2 and 10. The virus “prefers” to invade the auditory nerve, and deafness often occurs 2-3 weeks before, during or after the onset of the disease, often manifesting as unilateral severe sensorineural deafness, or even total deafness, but most of them are deaf on one side. 3. Ototoxic drugs: are also a common factor leading to deafness. Many deaf children are mostly deaf after medication, and many of them have the same experience: they have had injections, infusions or used certain drugs before they became deaf. Gentamicin, streptomycin, kanamycin, neomycin, etc. should be avoided as much as possible. 4. Noise: Children who are exposed to the roar of machines, the sound of firecrackers, the noise in the disco, and various noises for a long time can cause damage to the hair cells in the inner ear and cause a sharp decrease in hearing, which can lead to noise deafness. Parents should pay attention to their children’s speech and behavior. If they find that their children are unresponsive, introverted, or do not like to talk, or that they need to speak loudly to hear others, they must go to the hospital to have their children’s hearing screened, and if they are found to be hearing impaired, they should be treated as early as possible to get better results.