First, the vast majority of the hearing loss is dominated by high-frequency hearing loss, marked by the patient’s difficulty hearing high-frequency consonants such as c, s, i, sh, etc. Conversations are often interrupted with jokes. In severe cases, speech comprehension becomes poor, and patients often find others’ speech ambiguous. Secondly, most of them are accompanied by the phenomenon of reverberation. They may not be able to hear moderate intensity sounds, but they find it unbearable when the intensity of the sound increases. These patients often say that the louder the speech, the less they can hear clearly, and that it is better to speak more slowly at a normal volume. When choosing a hearing aid, it is important not to unilaterally seek to amplify a large amount of sound, but to be able to effectively control the loudness and over-amplification of the sound, as far as clarity can be improved by the hearing aid’s own speech reinforcement and noise reduction. The last symptom is tinnitus. Tinnitus is often a high-frequency sound, unilateral, and sometimes only the more severe side is noted, although both sides are present. As the hearing loss progresses, the tinnitus becomes more pronounced. Some patients may find that the tinnitus is more pronounced in a quiet room, but once they come out into the noisy street, the tinnitus becomes weaker or even disappears. These patients can use hearing aids to improve their hearing level while masking the tinnitus, just like coming from indoors to outdoors, the ear hears sounds loud enough to cover up the tinnitus, shifting the attention from only hearing the tinnitus to hearing the normal rich sounds.