The phenomenon of recurrent deafness is a symptom of sudden deafness. Sudden deafness (hereinafter referred to as sudden deafness) is a sudden onset of sensory nerve deafness of unknown cause, also known as violent deafness. The main clinical manifestation is unilateral hearing loss, which may be accompanied by tinnitus, ear blockage, vertigo, nausea and vomiting. Its onset is rapid, its progression is fast, and the treatment effect is directly related to the time of consultation, so it should be regarded as an otologic emergency. The deafness phenomenon is a reduction or disappearance of hearing loss due to an increase in the sound intensity of the stimulus; the strong sound tolerance is reduced, and the patient feels pain in the ear before reaching the strong sound tolerance of a normal person (105-110 dB). Prevention methods for the phenomenon of deafness: 1. Strengthen exercise, enhance physical fitness, avoid colds and prevent viral infections. 2. Do not overexert yourself, pay attention to the combination of work and rest, and keep your body and mind happy. 3, maintain a balanced diet, eat more fresh fruits and vegetables. Reduce the stimulation brought by smoking, alcohol, coffee, etc. 4.Control hypertension, hyperlipidemia, diabetes and other chronic diseases. 5.For patients who have already suffered from sudden deafness and still do not have a functional hearing level in the affected ear after treatment, in addition to the above recommendations, it is also recommended that the healthy side of the ear should be especially protected: ① Avoid exposure to noise; ② Avoid ototoxic drugs; ③ Avoid ear trauma and ear infections.