March 3 marks World Hearing Day, an initiative of the World Health Organization to raise awareness of deafness prevention and promote access to hearing care. The facts are alarming: according to the WHO, 1.5 billion people worldwide live with some form of hearing loss, and this figure is expected to rise to 2.5 billion by 2050. Yet the vast majority of cases of hearing loss could be prevented or effectively treated if action were taken in good time.
In Quebec, it is estimated that nearly one adult in five suffers from a significant hearing loss, and the average wait before consulting a professional exceeds seven years after the first signs appear. This delay has a significant impact not only on quality of life, but also on cognitive and mental health.
How hearing works and why it deteriorates
The human ear is an organ of extraordinary precision. Sound travels in the form of waves that vibrate the eardrum, transmit energy to the three ossicles of the middle ear - hammer, anvil and stirrup - and then generate movement in the fluid-filled cochlea. Thousands of hair cells transform these vibrations into electrical signals that are sent to the brain via the auditory nerve. These hair cells are the most vulnerable part of the auditory system: unlike other cells in the body, they do not regenerate once damaged.
Hearing loss can be conductive - linked to a problem in the outer or middle ear, often medically treatable - or sensorineural, linked to damage to the hair cells of the cochlea or the auditory nerve. The latter form, called sensorineural deafness, is generally permanent, but can be effectively compensated for by hearing aids or cochlear implants, depending on severity.
The main causes of hearing loss
Aging is the most common cause of hearing loss. Presbycusis - age-related hearing loss - progressively affects the high frequencies, and affects the majority of people over 65 to varying degrees. Exposure to noise is the second main cause: noise at work, concerts, high-volume headphones, or noisy urban environments damage hair cells in a cumulative and irreversible way. According to the WHO, over a billion young adults are at risk due to their listening habits.
Other causes include repeated or poorly treated middle ear infections, certain ototoxic drugs such as aminoglycoside antibiotics or certain diuretics, head trauma, autoimmune diseases, Meniere's disease, and benign tumors of the auditory nerve called vestibular schwannomas or acoustic neuromas.
Warning signs not to be ignored
Hearing loss often sets in gradually, making it difficult to perceive for oneself. Those close to the person concerned often notice the signs before they do. Signs that warrant consultation include: having to ask callers to repeat themselves or speak louder, having difficulty following a conversation in a noisy environment such as a restaurant, turning up the volume on the TV to a level that is uncomfortable for others, having difficulty understanding telephone conversations, or perceiving sounds in a distorted or muffled way.
Tinnitus - that ringing, buzzing or hissing in the ears without an external sound source - can also be an early sign of hearing damage or excessive stress on the auditory system. Although often benign, persistent tinnitus merits medical evaluation, particularly to rule out treatable causes.
Hearing loss and cognitive health: an underestimated link
Research in recent years has demonstrated a significant link between untreated hearing loss and cognitive decline. A study published in The Lancet identified hearing loss as the most important modifiable risk factor for dementia, ahead of smoking, depression and hypertension. The main hypothesis is twofold: on the one hand, sensory deprivation reduces brain stimulation and accelerates the atrophy of certain regions such as the auditory cortex; on the other, the constant cognitive effort required to decipher sounds in a context of poor hearing depletes the mental resources available for other functions.
Several studies suggest that wearing hearing aids can significantly reduce the risk of cognitive decline. This link reinforces the importance of early detection and management, well beyond mere communication comfort.
Hearing screening and assessment: where to start
First-line hearing screening can be performed during a medical consultation. The doctor performs an otoscopic examination of the ears to detect earwax obstruction, infection or eardrum abnormality. A simple screening test can be carried out in the office to assess sound perception. If hearing loss is suspected, referral to an audiologist for a full audiometric assessment is recommended. This accurately measures hearing thresholds for different frequencies, and helps to qualify and quantify hearing loss.
A common and easily treated cause of hearing loss is excessive wax build-up in the ear canal. Professional wax removal - by irrigation or suction - can quickly restore normal hearing, and is available at many of our Quebec locations.
Frequently asked questions about hearing and hearing screening in Quebec
At what age should you have your hearing assessed for the first time?
There is no universal age for a first hearing assessment in symptom-free adults. However, from the age of 50, a basic assessment is generally recommended to establish a baseline. In the event of symptoms - difficulty in hearing, tinnitus, blocked ear sensation - it is advisable to consult a specialist without delay, whatever your age. For people with professional exposure to noise, regular audiological monitoring is recommended from the outset of exposure.
Can earwax really cause hearing loss?
Yes, an earwax plug obstructing the ear canal can reduce sound perception by 40 decibels - the equivalent of a mild to moderate hearing loss. This is a common occurrence, and is entirely reversible with professional cleaning. However, it is not advisable to use cotton buds to clean your ears: they tend to pack earwax deeper into the canal rather than removing it. In the event of a blocked ear sensation or sudden hearing loss, medical advice is recommended before using drops or other home remedies.
Are hearing aids reimbursed in Quebec?
In Quebec, the Régie de l'assurance maladie du Québec (RAMQ) Hearing Aid Program covers part of the cost of hearing aids for eligible individuals - including children, adults under 55 with significant hearing loss, and certain specific clienteles. For adults over 55, partial subsidies may be available, depending on the situation. Some group insurance plans also cover part of the cost. An audiologist can direct you to the assistance programs available to suit your profile.
Can tinnitus be treated?
There is no universal treatment that makes tinnitus disappear, but several approaches can reduce its impact on quality of life. Sound therapy - which involves masking tinnitus with a pleasant background sound - can reduce its perception. Cognitive-behavioral therapy helps modify the emotional response to tinnitus, and is the best-documented approach to improving quality of life. When tinnitus is associated with hearing loss, hearing aids often reduce its perceived intensity by enriching the sound environment. An initial medical consultation can rule out treatable causes and direct you to the appropriate resources.
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