Noise-induced deafness

Noise-induced deafness: Any loud noise such as that from woodworking equipment, chain saws, internal combustion engines, heavy machinery, gunshots, or airplane engines can damage the inner ear. Activities like shooting, motor skiing, flying, and diamond mining are often associated with noise-induced deafness. Exposure to loud noises leads to the destruction of hair cells in the inner ear’s cochlea. Although there is a great variation in individuals’ sensitivity to noise-induced deafness, almost everyone will experience hearing loss if exposed to loud noises for long enough. Any noise above 85 dB is harmful. High-frequency tinnitus is usually accompanied by deafness. Hearing loss first appears at 4 kHz; if exposure to noise continues, it gradually spreads to lower and higher frequencies. Unlike most sensorineural deafnesses, less damage occurs at 8 kHz compared to 4 kHz. Explosive injuries (acoustic trauma) can cause similar types of sensorineural deafness. Prevention involves limiting exposure to noise, reducing the intensity of the noise source, and isolating people from those sources. If the noise intensity increases, the exposure time must be reduced to protect the inner ear from damage. Wearing protective gear such as plastic earplugs inserted into the ear canal or earmuffs filled with glycerin can reduce the amount of noise that reaches the ear. When noise-induced deafness affects communication, hearing aids can be helpful. Causes: Noise with an intensity of 85–90 dB or more can cause damage to the cochlea. The extent of this damage depends on the following factors: 1. Noise intensity: The incidence of noise-induced deafness increases as noise intensity rises. 2. Noise spectral characteristics: Under the same intensity, high-frequency noise causes greater hearing damage than low-frequency noise ； Narrow-band noise or tones cause greater damage to hearing than wide-band noise. 3. Noise type: Pulse noise is more harmful than steady-state noise. 4. Contact time and method: Continuous contact causes greater damage than intermittent contact ； The longer the exposure to noise, the more severe the hearing damage ； The closer to the noise source, the more susceptible hearing is to damage. 5. Individual susceptibility: Older and weaker individuals, as well as those who have previously suffered from sensorineural hearing loss, are more susceptible to noise-induced damage ； As for the impact on those with middle ear diseases, there are differing opinions; some believe that in cases of tympanic membrane perforation and disruption of the ossicular chain, noise-induced damage is relatively mild. Symptoms: The main manifestations of noise-induced deafness are progressive hearing loss and tinnitus. Regarding the early symptoms of noise-induced deafness, they have little impact on hearing; they can only be detected with the help of an audiometer. If the symptoms of noise-induced deafness become severe, patients may experience hearing difficulties, and in more extreme cases, it can even lead to total deafness. In fact, deafness and tinnitus occur simultaneously, but they can also appear separately; this is what people refer to as high-pitched tinnitus, which causes distress day and night. Prolonged exposure to high-level noise can also lead to functional disorders in various tissues and organs such as the cerebral cortex, the sympathetic nervous system, the heart, the endocrine system, and the digestive system. Experts point out that noise-induced hearing loss should not be ignored; delayed or improper treatment can severely affect hearing and even lead to systemic health complications. Additionally, the following situations also indicate that you may suffer from noise-induced hearing loss. 1. During face-to-face conversations, I often feel that I can’t hear clearly and ask the other person to repeat themselves ； 2. When making or receiving calls, I always feel that the environment is too noisy and the volume of the speaker’s voice is low, so I have to ask the other party to speak louder ； 3. When watching TV, listening to the radio, or attending meetings, sounds that seem normal to others sound difficult for me to hear ； 4. I’m not originally a person with a loud voice, but I keep unconsciously raising my volume when speaking. Therapeutic editing: Auditory nerve regeneration and restoration therapy. It possesses effects such as opening orifices, unblocking meridians, strengthening the kidneys, detoxifying, promoting blood circulation, and improving hearing. Traditional Chinese medicine formulas are used in a targeted manner to unblock meridians and remove toxins, nourish blood and resolve stasis, replenish yin and qi, and enhance fragrance to open orifices; this approach enables symptomatic treatment of deafness and tinnitus. 2. It helps to regulate qi flow and open orifices, improves blood supply to the inner ear, enhances metabolic activity in the ear, and increases the excitability of hair cells. It resolves blood circulation disorders, nourishes and repairs ear cells, activates the cochlear nerves, thereby enabling the repair and regeneration of ear cells. 3. It has the effects of promoting blood circulation to remove stasis, eliminating free radicals, repairing damaged cells, and relieving ear pain; it can promote the repair and regeneration of degenerated, atrophied, or necrotic auditory nerve cells in a short period of time. Through comprehensive and standardized treatment, tinnitus can be eliminated and normal hearing restored within a short time. 4. Local light wave therapy can regulate vascular function, accelerate blood flow, and improve the blood and lymphatic circulation in the inner ear; it enhances tissue metabolism, corrects hypoxia in the inner ear, and helps to eliminate harmful substances, thereby promoting the improvement and recovery of cochlear function and hearing ability. 5. Electroacupuncture for treating deafness and tinnitus involves the direct application of pulsed electromagnetic fields to the patient’s middle and inner ears; these electrical waves improve local blood circulation, enhance tissue permeability, and boost blood supply to the cochlea, thereby aiding in the restoration of its normal physiological functions. What is deafness? Editor: The concept of deafness: hearing impairment or reduced hearing resulting from abnormalities in the conductive and sensory functions of the auditory system. The concept of deafness: hearing impairment or reduced hearing caused by abnormalities in the conductive and sensory functions of the auditory system. It is generally referred to as deafness. Under normal circumstances, it is possible to hear the other person speaking more loudly; such a condition is not called deafness, but rather \"hearing loss.\" Deafness occurs when it is impossible to hear external sounds clearly or at all. The degree of hearing loss can vary. In young children, deafness occurs due to underdeveloped ears or certain diseases; the location and nature of the ear abnormalities vary. Inability to learn a language can lead to deafness and muteness. Deafness can be divided into conductive deafness and sensorineural deafness. Conductive deafness is caused by lesions in the outer and middle ear, which hinder the transmission of sound waves; it depends on the location of the damage in the ear. This is known as conductive deafness. If there are problems with the inner ear that receives sound waves, or along the auditory nerve pathway from the inner ear, it affects the perception of sound; this is referred to as sensorineural deafness. Deafness that results from lesions in all three parts – the outer ear, middle ear, and inner ear – is called mixed deafness. Damage to the inner ear caused by noise: (1) Mechanical damage – When sound waves reach the inner ear, the intense fluid movements create vortices that strike the cochlear duct, leading to the rupture of the vestibular membrane. This causes the mixing of endolymph and perilymph, resulting in necrosis and degeneration of hair cells. When the basilar membrane is vibrated, microholes form in the reticular layer, allowing endolymph to infiltrate; this can also lead to an excess of potassium ions, resulting in the necrosis of hair cells. (2) Vasoconstriction: Noise stimulation causes vasoconstriction in the cochlear blood vessels, leading to tissue ischemia and necrosis. (3) Metabolic disorders: Anaerobic metabolism occurs in cells, preventing the breakdown and synthesis of proteins, lipids, and glycogen. Prevention of noise-induced hearing loss: Noise-induced hearing loss is generally caused by noise, so preventive measures are particularly important. Preventing hearing loss is a key focus of occupational health and safety efforts; noise levels in noisy workplaces should be monitored, and workers’ hearing should be checked regularly. Those who are already deaf should not work in noisy environments. Noise protection standards should be established; countries such as the UK and the US have set them at 85dB to 100dB, while China has set them at 85dB to 90dB. Any factory or mine whose noise level exceeds this limit must renovate its facilities by installing isolation and sound-damping equipment ； Modify the machine to reduce noise ； Individuals can wear protective earplugs and helmets, or reduce the time spent exposed to noise. Standard protective earplugs should be able to reduce noise by more than 40 dB. In daily life, one should try to stay away from noise sources in order to avoid being harmed by noise. Precautions for deafness Edit 1: If young people experience occasional brief episodes of tinnitus that resolve quickly, it is likely due to sudden exposure to noise, or factors such as work stress, high pressure, and insomnia. Paying attention to daily habits and ear usage practices can help alleviate these symptoms ； If tinnitus persists for 1-2 days, it is necessary to go to the hospital for a check-up. 2. Don’t assume that just because it’s tinnitus and hearing isn’t affected, it’s not a serious issue; some cases of high-frequency hearing loss start with only tinnitus without any impact on hearing, but over time hearing loss may suddenly occur. During a flight, as the airplane takes off the air pressure drops rapidly, which can cause a feeling of fullness in the ears; in some people this may also lead to temporary hearing loss and ear pain. 3. This is because when an airplane is ascending or descending, changes in air pressure cause abnormal pressure levels in the middle ear cavity, which leads to compression and blockage of the eustachian tube. As a result, the middle ear cavity ends up under negative pressure, and symptoms such as blocked ear canals, tinnitus, a feeling of fullness in the ears, and hearing loss occur. Therefore, it is possible to chew gum during takeoff and landing; as one chews and swallows, the eustachian tube opens and closes continuously, allowing air to flow freely in and out of the middle ear. This helps maintain a normal balance between the pressure inside the middle ear and the external atmospheric pressure, thereby reducing or eliminating ear discomfort. 4. Young parents should be aware that children, especially infants, are prone to ear inflammation and hearing loss as a result of upper respiratory tract infections. Especially for newborns, do not let them lie flat while feeding; hold them at an angle as much as possible, as this helps prevent choking. If milk gets into the ears and cannot be expelled, bacteria can grow, leading to ear infections.