Health encyclopaedia - Alphabetical Topic List健康百科全书-按字母顺序排列的主题清单

| A | | 1 | | B | | b | | C | | 人才招聘 | | D | | | | E | | 电子 | | F | | f | | G | | 克 | | H | | h | | I | | 我 | | J | | j | | K | | k | | L | | 升 | | M | | 米 |
| N | | n | | O | | o | | P | | p | | Q | |常见问题 | | R | | 研究 | | S | | | | T | | 吨 | | U | | u | | V | | v | | W | | 瓦特 | | X | | x | | Y | | y |

Causes of Hearing impairment原因听觉受损

There are a great many causes of deafness and hearing impairment.有许多的原因，耳聋和听力损伤。 The biggest single cause is age, called age-related hearing loss (presbyacusis).最大的单一原因是年龄，所谓的年龄相关性听力损失（ presbyacusis ） 。 Most people begin to lose a small amount of their hearing between the ages of 30 and 40 years old.大多数人开始失去一个小数目，他们的听力年龄介于30至40岁。 This hearing loss increases with age and by 80 years old most people experience a significant loss of hearing.这听力损失的增加与年龄由80岁的大多数人的经验，重大损失的听证会。

Age-related hearing loss occurs because the hair cells that line the sound pathway in the ear begin to die.年龄相关性听力损失的发生是因为毛细胞线的声音通路在耳朵开始死亡。 Commonly, high frequency sounds such as female or children’s voices become difficult to hear, and it is harder to hear consonants like the letters s, t, k, p, and f.常见的，高频率的声音，如女性或childrenâ € ™ s的声音变得难以听到，这是难以听到辅音字母一样， s ，吨，钾，磷，和F 。

Another common cause of hearing loss is damage to the ear from loud noises (acoustic trauma ) , when part of the inner structure of the ear is injured.另一个常见的原因是听力损失的损害耳朵从噪音（声损伤） ，当部分的内在结构的耳朵受伤。 People who are exposed to loud noises over long periods are more likely to develop acoustic trauma.人谁是暴露在高噪音超过长时间更有可能发展声损伤。 This may include people working close to loud music (such as night club staff), people who work with noisy equipment (such as pneumatic drills/compressed air hammers) and people who listen to high volume music through headphones.这可能包括工作的人，接近嘈杂的音乐（如夜总会工作人员） ，人谁的工作与高噪音设备（如风钻/压缩气动锤）和人民谁听高音量的音乐，通过耳机。

After listening to very high noise levels your hearing will shift it’s threshold, causing you to experience muffled hearing or ringing sounds in your ears.听了后非常高的噪音水平，您的听力将转向itâ € ™ s门槛，导致您的经验， muffled听觉或响铃的声音在您的耳朵。 This is temporary and your usual hearing should return within a few hours.这是暂时的和你惯常的听证会应该返回了数小时。 However, prolonged or intense exposure to very high noise levels can result in a permanent threshold shift or tinnitus.然而，长时间或激烈的接触非常高的噪音水平，可能会导致出现一个永久性阈移或耳鸣。