Your ability to hear depends on the hairs on the cochlea (a circular structure in your ear containing tiny hairs called cilia). When these hair cells die, that's what causes hearing loss. It's thought that repeated exposure to loud noises or diminished blood supply cause these hairs to die.
Of course, hearing loss can occur for other reasons as well. An excess of earwax can cause you to lose hearing sensitivity. Also. A relatively simple and treatable infection can develop if water gets trapped inside your ear (a common occurrence in children). Without quick treatment, it can lead to hearing loss.
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