Hearing impairment refers to the organic or functional abnormality of the transmission, perception and comprehensive analysis of sound by the auditory system, which leads to different degrees of hearing loss. Habit is called deafness.
Only severe hearing loss is called deafness, which means that the patient can't hear a word in both ears. Hearing loss that does not reach this severity is called hearing loss.
Extended data:
Causes of hearing loss:
1, genetic factors
Most of the sensorineural deafness caused by genetic factors is severe or extremely severe deafness.
2. Environmental factors
Including various viral or bacterial infections, ototoxic drugs, head trauma and radiation.
3. Deafness caused by drugs and chemicals
Drug-induced deafness: aminoglycoside antibiotics are one of the main causes of hearing impairment in children in China. Chemicals: some industrial preparations such as lead and mercury damage the hearing organs, carbon monoxide poisoning leads to hemoglobin oxygen-carrying disorder, and nerve hypoxia will affect the hearing system, especially children.
4. Noise deafness
Adults are more common than children. Bilateral or unilateral high frequency hearing loss.
Baidu encyclopedia-hearing impairment