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Hearing loss isn't just for older people anymore. Along with increases in the popularity of portable music devices, such as popular MP3 players, and modern conveniences like leaf blowers, it's becoming more common to find younger people who are experiencing hearing loss.

Loud noises cause hearing loss through damage done to the nerve cells and hairs of the cochlea, the part of the inner ear that transmits sound information to the brain. Some damage is temporary, but very loud noises or exposure to noise over long periods of time can cause permanent hearing loss. The National Institute for Occupational Safety and Health estimates that nearly 30 million Americans are exposed to high levels of noise on their jobs.

"Noise-induced hearing loss is very common," says audiologist Heather Wilson of Hearing Ear & Audiology Resources. "It can often be accompanied by annoying tinnitus (ringing in the ears). So, in addition to the frustration of not clearly hearing or understanding speech, people with this form of hearing loss may also be struggling with ringing sounds that don't go away."

In addition, factors other than noise can contribute to hearing impairment: ageing, heredity, side effects of certain medications, and illnesses that result in high fevers.

Signs and symptoms of hearing loss include:

• Muffled conversational sounds
• Difficulty distinguishing words through background noise or in a crowd
• Feeling the need to increase the volume of televisions, radios or music
• Constantly asking people to speak more slowly or loudly, or asking them to repeat what they just said

To determine the extent of hearing loss or assess the ability to hear clearly, a doctor or audiologist-a specialist who diagnoses and treats hearing problems- performs a series of tests that present a range of tones at different volumes. Based on the results of the tests, treatments may include the removal of earwax, the use of hearing aids or cochlear implants-electronic sound-amplifying devices that are inserted into the ear-for the most severe loss.

"Most hearing losses are treatable either medically or through the use of hearing instruments," says Wilson. "The audiologist's expertise is crucial in this process-we can determine who needs to be treated by a physician, as well as identify those whose hearing loss can benefit from amplification. Successful intervention, whether medical or through use of hearing instruments, tremendously improves the person's daily communications and overall quality of life."

There are ways to avoid the hazards that cause noise-induced hearing loss.

• Use ear plugs. Disposable ear plugs are one of the easiest ways to help prevent damage from excessive noise around machinery or at sporting events and concerts with amplified sound.
• Turn the volume down. If you listen to music through earphones, make sure the volume is low enough that you can still hear conversations and background noise.
• Have your hearing checked. If you work in a noisy environment, regular hearing tests can detect loss and help you know when to take preventative measures to safeguard your hearing.