—— wrote in the 2015 National “Ear Care Day” In China, the problem of youth’s eyesight is more important to the parents of students – because the loss of eyesight can seriously affect their children’s learning; however, the hearing problem, which is as important as eyesight and affects the learning, communication, physical and mental health of young people, is easily ignored. In fact, China is the country with the largest number of hearing disabilities in the world. In recent years, along with the popularity of cell phones, tablet computers and other electronic products and the increase in the number of entertainment venues such as concert halls and bars, the public, especially teenagers, are at increasing risk of noise hearing damage due to improper ear use. Teenagers have become the most widespread victims of recreational noise. From the perspective of environmental protection, any unwanted or harmful sound that affects people’s normal study, life, rest and work, and makes people feel bored, can be called noise. Among them, recreational noise is the most closely related to our life, causing hearing loss is the most common and most easily ignored a noise. Recreational noise, specifically, refers to the sound that may cause hearing loss due to various recreational activities, such as: 1, various players: such as MP3, MP4, repeater, tablet PC, TV, etc.; 2, the sound of various musical instruments; 3, various children’s toys such as electric toy cars, guns, etc. 4, the sound of leisure and entertainment places: discos, KTV, amusement parks, etc. KTV, amusement parks, etc.; 5, various events: shooting, soccer matches, horse racing, etc.; 6, the sound from various celebrations: firecrackers, party reunions, chorus ????? From the above, it can be seen that in addition to occupational factors (actors, KTV staff), teenagers are the ones who are exposed to more recreational noise. The use of repeaters, MP3 and MP4 in study; the use of computers and video games in leisure time, and the willingness to participate in lively and noisy group activities, etc., are all important reasons that currently exacerbate hearing loss in adolescents. Of course, unlike other diseases, hearing loss is not easy to detect and pay attention to. Research has proved that the initial hearing loss of noise deafness is in the frequency of 4000HZ (high frequency), the hearing loss of this frequency has little impact on our daily life and is not easy to be noticed; with the continuous damage of noise, hearing loss of other frequencies will occur and eventually lead to “noise deafness” and need to wear hearing aids to solve. So, why can noise, especially recreational noise, cause so much harm to our hearing? Our inner ear has 18,000 auditory cells, which are ciliated cells with a diameter of about 0.01 mm that are easily affected by noise and cannot be regenerated after damage. The pathology of noise-induced hearing loss is that long-term noise stimulation causes blood circulation disorders in the vascular pattern of the cochlea, damage and loss of hair cells in the spiral apparatus, and in severe cases, damage to the inner hair cells, followed by degenerative lesions in the spiral ganglia, with the most severe and obvious lesions in the end of the cochlear basal circle and the second circle. This is where the cochlear basal ring is responsible for receiving mainly 4,000 Hz sound stimuli, which is the reason why noise deafness is initially seen in the high frequency region! The mechanical damage theory suggests that this is a result of the mechanical impact of sound waves, which causes damage to the auditory organ, including the following four points of view: (1) a strong vortex of fluid impacts the cochlear canal, causing the vestibular membrane to rupture, and the mixing of internal and external lymphatic fluid leads to changes in the ionic composition and damage to the cells of the spiral apparatus, followed by vascular striae atrophy and nerve fiber degeneration; (2) a strong vibration of the basilar membrane leads to microporosity of the reticular layer, and endolymphatic infiltration around the hair cells. It is worth mentioning that noise-induced hearing loss can be divided into temporary hearing threshold shift and permanent hearing threshold shift, commonly explained: temporary threshold shift, also known as auditory fatigue, is a temporary hearing loss, which can be removed from the noise environment within minutes, hours, days or months. hours, days, or months. Permanent threshold shift is a hearing loss that cannot be recovered from the effects of noise. Both blast (acute) and noise (chronic) sound damage can occur. It can be seen that minor hearing loss caused by noise in the early, short-term period can be recovered by removing the ear from the noisy environment and giving it a rest; long-term, chronic noise stimulation is the culprit of permanent upward hearing threshold shift. Recognizing this, learning to use our ears scientifically, rationally and safely can prevent noise from causing damage to our hearing. Here’s what doctors recommend: 1. Reduce exposure: Using headphones on commonly used output devices for 3 consecutive hours can cause a temporary hearing threshold shift of greater than 10dB; therefore, not wearing headphones for long periods of time is an important measure to isolate noise damage. Often wear headphones, especially like to wear built-in headphones to listen to CD enthusiasts should master 60 ~ 60 ~ 60 principle, that is, when listening to music, the volume does not exceed over 60% of the maximum volume, continuous listening time of no more than 60 minutes, the best external sound does not exceed 60 dB;. Wear built-in headphones to listen to MP3 enthusiasts to follow the 80 ~ 90 principle, that is, the volume does not exceed 80% of the maximum volume, continuous listening time of no more than 90 minutes. 2, individual protection: for those who participate in noise activities, use ear plugs, earmuffs and anti-sound caps when necessary. Actors and staff can choose suitable earplugs for protection according to their working environment, and sound entertainment preferences also try to wear earplugs when attending concerts and other large entertainment activities. 3. Good habits: Developing good ear habits is essential for hearing protection. How to use your ears properly includes: (1) not digging your ears too often; (2) keeping your ear canal dry; (3) blowing your nose properly; and (4) treating ear diseases promptly. In addition, we would like to remind you that (1) it is better not to listen to music with headphones in noisy places such as buses or streets, because people often unconsciously increase the volume in order to cover the noise, which will do more harm to the ears. (2) Do not listen to headphones while sleeping, as earplugs caught between the pillow and the ear can cause damage to the eardrum; if you fall asleep while listening to music, the damage will be more obvious when the ear is in a dormant state. (3) Always raise awareness of self-protection and have regular hearing exams for people at risk. As the saying goes, “Deaf people are three times deaf”. If we have good hearing, we can hear even the sound of bees wandering through the flowers – this is the hearing sensitivity; if the hearing sensitivity is impaired and further causes hearing loss, then it brings more effects than just hearing loss, hearing allergy, tinnitus, reduced speech acceptance and speech signal discrimination, but also headache, dizziness, insomnia, mood There are also neurological symptoms such as headache, dizziness, insomnia, depression, unresponsiveness and agitation; digestive symptoms such as gastritis and dyspepsia due to dysfunction of gastrointestinal motility and gastric secretion; and cardiovascular symptoms such as increased heart rate, increased blood pressure, arrhythmia, conduction block and changes in peripheral blood flow. All of these will cause great harm to our health. Teenagers are one of the groups most exposed to recreational noise, but only 8% of them are aware of and concerned about hearing loss. We hope that through the promotion of “Ear Care Day 2015”, we can make children and other people who are exposed to noise environment and at risk of hearing loss realize the importance of safe ear use, master scientific and effective methods to protect hearing, reduce the incidence of noise hearing loss, and make more people enjoy the beauty of sound for a longer time.