A patient with a hearing loss of 30dB or more, i.e. a 30dB increase in the hearing threshold for that frequency, can be diagnosed as deaf. A very strong noise with a large change in the top of the spectrum, jumping up and down, and other noise damage to the ear can cause a rise in the hearing threshold. So, how should a patient’s hearing threshold rise be diagnosed? The following is a brief introduction: instant exposure to burst waves in response to immediate auditory fatigue and hearing threshold rise, good temporary threshold shift, reversible lesions, rest 1 to 2 hours to be able to return to normal, sometimes it takes several days or weeks to fully recover. Due to the different locations of exposure to sound sources, there can be a 20dB difference in hearing damage between the two ears, with the damage area first appearing at 6kHz as a valley, twice as much as at 4kHz. If repeatedly exposed to blasts, it becomes irreversible and permanent threshold shift, i.e. permanent deafness. According to Wang Boti (1982) in the self-defense counter-attack against Vietnam, 59.9% of people with sensorineural deafness, 8.9% with mixed deafness, and 0.5% with psychogenic deafness occurred. Most of the acute injuries complained of severe ear pain and tinnitus, and half of them had headache and vertigo. The vertigo sometimes resembles Meniere’s disease and sometimes positional vertigo due to stripping and degeneration of the vestibular membrane and can last for months to years. Moderate deafness is defined as a hearing level loss of 40-70 decibels, severe deafness as a hearing level loss of 70-90 decibels, and profound deafness as a hearing level loss of more than 90 decibels. Of course, regardless of the degree of deafness, medical testing and medical treatment are required. Observing hearing defects in very young babies is not an easy task. Despite hearing deficits, babies can smile, stir, and respond to sounds. Because the sound is accompanied by a stream of air that the baby feels and turns his head, it is difficult for parents to detect the hearing deficit. Because of this, it is essential and important to have your baby’s hearing checked regularly after birth. Conductive deafness is related to the outer and middle ears. The main cause of disability is a severe chronic otitis caused by recurrent severe otitis. The main characteristic of conduction deafness is that the hearing loss is usually mild to moderate. It must therefore be treated as soon as possible. The statistics are alarming:1/3 of babies suffer from this ear disease during a period of two consecutive months before the age of 3. However, we do not yet have figures on how many babies develop conductive deafness. The disease can be cured with antibiotics and tympanic cannulae. But if these methods don’t improve your baby’s hearing, he may have sensory deafness that just isn’t being detected. Blast injuries mostly occur in war, so weapons should be improved to reduce the strength of the blast sound, fortification buildings should be strengthened, warriors should be educated to pay attention to protective body positions during combat, and when firing guns and blasting gunpowder, attention should be paid to open-mouth breathing and swallowing movements to facilitate the opening of the eustachian tube. The use of protective earplugs and helmets, domestic has a variety of models of protective earmuffs and helmets, such as injury V-51R earplugs and JW-2 type earplugs.