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Causes of Noise-Induced Hearing Loss
How Does a Loud Noise Cause Hearing Loss?
Loud noises can cause damage to the hair cells in the inner ear and to the hearing nerve, called sensorineural hearing loss or nerve deafness. (Sensorineural hearing loss also can be caused by infection, head injury, aging, certain medications, birth defects, tumors, problems with blood circulation or high blood pressure, and stroke.)
Damage can occur from a brief, intense noise such as an explosion, or from continuous loud noises such as noises in a loud work environment. Hearing loss from loud noises may be immediate or occur slowly over years of continuous exposure.
Immediate hearing loss is often accompanied by tinnitus, or ringing in the ears or head. Immediate hearing loss can occur in one or both ears and often involves severe damage to the inner ear structure.
Prolonged exposure to noise can actually change the structure of the hair cells in the inner ear, resulting in hearing loss. Tinnitus, which is the sound of ringing, roaring, buzzing, or clicking inside the head, often occurs with prolonged noise exposure damage, as well.
Hearing loss from noise can be permanent or temporary. If the hearing loss is temporary, hearing usually recovers within 16 hours of loud noise exposure.
Gradual hearing loss may occur after prolonged exposure to 90 decibels or above. Exposure to 100 decibels for more than 15 minutes can cause hearing loss. Exposure to 110 decibels for more than a minute can cause permanent hearing loss.