The human auditory-verbal system is a complex system that requires the joint participation of the outer ear, middle ear, inner ear, auditory nerve, auditory center, and speech center. Damage to any one of these components can cause hearing impairment, which in turn affects speech function and thus has an impact on social interaction and quality of life. Hearing aids can compensate for hearing impairment to a certain extent. Broadly speaking, hearing aids should be worn as early as possible when hearing loss in both ears reaches a certain level. Before choosing the right hearing aid, we must understand the following facts: 1. Hearing aids are actually ultra-small amplifiers that have no therapeutic effect on the diseases that cause hearing loss. Most people with irreversible hearing loss after treatment can be fitted with hearing aids, regardless of whether the hearing loss is sensorineural, mixed or conductive. However, for certain diseases, such as auditory neuropathy, hearing neuroma with progressive hearing loss, hearing abnormalities caused by certain central brain diseases, the effect of hearing aids can be very poor or ineffective. 2, according to the WHO standard hearing loss degree is divided into mild 26-40 decibels; moderate 41-60 decibels; severe 61-80 decibels; very severe 80 decibels or more. Simply put, once the hearing loss affects the ability of speech communication (such as answering the phone, face-to-face communication in noisy environment, etc.), you should choose hearing aids as soon as possible. For people with special needs, such as professional requirements, frequent participation in important negotiations, major social events, etc., hearing aids can be used for mild hearing loss. It should be understood that for severe sensorineural deafness, hearing aids cannot fully compensate for the hearing loss, but must rely on lip reading, expression, association and other ways to help. The purpose of hearing aids is to maintain a sound environment and to prevent or delay the deterioration of the hearing and speech centers. For people who are totally deaf, there is basically nothing to help them. 3. According to the International Organization for Standardization (ISO), the likelihood of deafness after 30 years of working in an environment with noise levels of 85 and 90 decibels is 8% and 18% respectively. Therefore, hearing aids that amplify noise and speech indiscriminately can be detrimental to hearing in some cases. Therefore, a good hearing aid should be able to: automatically adapt to the environment, effectively reduce noise, improve speech frequency recognition, and protect residual hearing; naturally reproduce sound, optimize the patient’s perception of their own voice, and improve the naturalness, realism and comfort of the sound; automatically eliminate feedback (whistling); the parameters of the hearing aid can be adjusted with the changes in the wearer’s hearing; the functions of the hearing aid can be enhanced with the The functions of hearing aids can be enhanced with the upgrade of hearing aid matching software. 4. Hearing aids are not a simple commodity that can be purchased and used at will, but must undergo strict fitting before they can be worn. The fitting personnel must be professionally trained, and the fitting process also requires hearing test, hearing aid trial and effect evaluation. The consequences of improper fitting can be very serious. After the initial fitting is completed, the fitter will make regular visits (7 days, 30 days, 180 days, etc.) and can make appointments for re-commissioning at any time if you are not satisfied. Hearing aid commissioning includes: hearing aid gain adjustment, output adjustment and adjustment of various functions. The first 1-2 months are the adaptation period, and the patients need different adjustment times as they adapt to the progress, usually 1-2 times for fine-tuning. 5.After wearing hearing aid for a period of time, if you feel that the effect is reduced or even invalid, you should differentiate different situations. If it is the early stage of wearing, you need to contact with your audiologist or dispenser to determine whether it is the normal adaptation process or the lack of mastery of wearing matters. The audiologist or dispenser will be more conservative in adjusting the gain of the hearing aid at the beginning of the hearing aid wearing period, and the patient will need to adjust various adjustment items after a period of adaptation. However, if there are other conditions, such as sudden decline and exclusion of hearing aid problems, or tinnitus, vertigo, headache, etc., you should seek the help of an otologist in time, except for the aggravation of the original disease or new diseases. 6, once the hearing aid is selected, it is recommended to use it for life, but the daily wearing time should be different from person to person. For people with mild hearing loss, you can choose to wear them when you need them, and for those with moderate loss or above, you can wear them frequently in daily life. For children with prelingual deafness, it is necessary to wear them all the time except for sleep, bathing and outdoor work on rainy days to ensure the compensation of hearing and speech learning.