I have been working with hearing aids for almost 20 years. One of the things that has struck me most is the issue of hearing aids after hearing loss in both ears. It seems that in principle, the hearing aid should be fitted to the lesser hearing loss and the ear with good speech discrimination, or to both ears at the same time. Here, I would like to remind you of the following phenomena: for example, one ear has been suffering from otitis media for a long time, but the other ear has recently suffered from a sudden loss of hearing and comes to the clinic; one ear is less deaf, but the other ear has recently suffered from a sudden loss of hearing that is even more severe than the original bad ear; one ear has a hearing loss that causes recurrent The hearing loss in one ear has caused recurrent vertigo, which is not relieved by medication. What is the cause? Have we clinicians ever considered this problem? Because many patients present with unilateral deafness followed by recent deafness on the other side to a lesser degree and for a shorter period of time, gave me the opportunity to try something bold: aggressive treatment of the recently deafened ear and, at the same time, hearing aids for the previously bad ear!!! Because such an ear tends to hear below 70 decibels, the prominent manifestation is extremely poor discrimination, even with reverberation. Therefore, I don’t choose machines for my patients that are very high end, especially for very severe deafness! Of course, there are still a lot of skills and experience in adjusting the gain of the machine! Over the past 10 years, more than 90% of my patients’ experiences have shown me the indisputable fact that both ears are functionally synergistic, mutually supportive and integrated. Thus, it is extremely important to establish a functional balance in both ears!!! As I said above, if there is a recent hearing loss in the better ear, it is important to wear a hearing aid in the heavier ear in a timely manner, so that the better ear can be helped to regain its hearing and the treatment can be twice as effective! If the hearing loss in that side of the ear is very severe, it is also necessary to wear a hearing aid after 1 to 3 months of treatment. If a hearing aid is given to a later deaf ear according to conventional principles, the result will be more and more deafness. I hope that colleagues and patients will treat this with caution. I have published papers on this issue in the audiology journals in 2001 and 2004, which I welcome you to read and correct.