Hearing loss from noise does not announce itself. There is no pain, no single moment of damage in most cases, and no day on which a man notices he is hearing less. What happens instead is that the television creeps louder over several years, conversations in a busy room become work, and a wife starts pointing out that everything has to be repeated. By the time the pattern is obvious to the man himself, a considerable amount has already gone.
The particular cruelty of noise-induced hearing loss is that it is entirely preventable and entirely permanent. The hair cells in the inner ear that convert sound into nerve signals do not regenerate in humans. Hearing aids amplify what remains; they do not restore what was lost. Everything useful about this subject therefore sits on the prevention side.
How Noise Causes Damage
Damage depends on both loudness and duration. Sound is measured on a logarithmic scale, so each ten-decibel increase represents roughly a doubling in perceived loudness and a much larger increase in energy. As a rough guide, exposure becomes a concern around eighty-five decibels over an eight-hour shift, and safe exposure time halves with every few decibels above that. A chainsaw, an impact wrench, a grinder, heavy equipment cabs, drilling rigs and firearms all sit well above that threshold. Loud enough impulse noise — a gunshot, an explosive blow — can cause damage instantly.
The high frequencies go first, which is why the loss is so easy to miss. Consonants like s, f, th and t carry high-frequency information and are what make speech intelligible. Vowels are low-frequency and survive longer. The subjective experience is not that things are quieter but that people are mumbling, and it becomes markedly worse where there is background noise — a truck cab, a shop floor, a crowded bar.
Tinnitus — ringing, buzzing or hissing that persists after the noise stops — is often the first sign of damage. Ringing after a shift that fades by morning is not harmless; it indicates the ear has been overloaded. When it stops fading, it tends to become permanent. Tinnitus is also linked with poorer sleep, difficulty concentrating and low mood, which is worth taking seriously rather than accepting as an inevitable cost of the work.
Protection That Actually Works
Hearing protection is only as good as its consistent use. Earplugs inserted incorrectly, or removed for the ten minutes of the loudest task because someone needs to be heard, provide considerably less protection than their rating suggests. Foam plugs need to be rolled thin, inserted deep, and held while they expand. Earmuffs need an unbroken seal, which safety glasses arms and hard hat straps can compromise. Doubling up — plugs under muffs — is appropriate for the loudest environments.
Custom-moulded plugs are more comfortable and consequently worn more often, which matters more than the rating on the packet. For men who need to hear speech and equipment cues, electronic protection that amplifies quiet sound and cuts loud sound is available and removes the main reason protection gets taken off.
Noise off the job counts toward the same total: recreational shooting, snowmobiles, dirt bikes, power tools at home and loud music through headphones. The ear does not distinguish between work noise and leisure noise.
Testing and What Follows
An audiogram measures hearing across frequencies and detects noise-induced loss long before it is noticeable in daily life. Noise-exposed workers in Alberta are generally entitled to periodic testing, and where a workplace programme exists, using it is worthwhile — an early result showing a high-frequency notch is a warning that protection needs improving while there is still something to protect.
Some hearing problems are not noise-related and are worth distinguishing: earwax obstruction, infection, medication effects, and hearing loss affecting only one ear, which always warrants assessment. Sudden hearing loss in one ear is a medical urgency, because treatment given quickly can sometimes recover it.
Untreated hearing loss carries knock-on effects — social withdrawal, strain on relationships, and an association with cognitive decline in later life — and hearing aids address those far better than waiting does.
Dr. Raymond Nash provides family medicine care at Grande Prairie Men’s Medical Clinic, including assessment of hearing concerns and referral where testing is required. Appointments can be booked at gpmm.clinic or on (587) 416-8296. This article is general information and does not replace an individual medical assessment.