Like the ultraviolet rays of the sun damaging the lens of the eye, environmental factors can damage the ear: Noise-induced hearing loss, from prolonged exposure to sudden loud sounds in the workplace or at rock concerts, can damage the hair cells of the ear irreversibly. The best preventative is to wear earplugs when you’re going to be around loud noises. High blood pressure, diabetes, and chemotherapy can also irreparably damage the hair cells.
