Hearing is the bridge and link for human beings to listen to the beautiful world, integrate into social life, and communicate with people. Hearing fatigue is a temporary hearing threshold shift that occurs after a period of exposure to strong noise. If you go to a quiet place for a period of time, you still cannot gradually recover the original state, and then you need to go to the hospital for relevant examinations. Patients can do bitonal auditory nerve examination and pure tone audiometer examination, and the following are the examination precautions. A bit of auditory nerve examination precautions: before the examination contraindications: before the examination to do a good job of knee and wrist and other parts of the protection and to choose a smooth ground to prevent falls and sprains or bruises when doing vestibular hypofunction examination. Examination requirements: 1, hearing tuning fork test is, the tuning fork sound should be appropriate, not too large. 2, vestibular function examination to prevent injuries from falls. Note for pure tone audiometry: Taboo before examination: Clean your ears well. Requirements during the examination: 1. Quiet environment. 2. Care should be taken to use intermittent tones during the examination to avoid auditory fatigue. The operation of the bone conduction test is the same as that of the air conduction test. 3. If the air conduction threshold of the two ears is more than 40dB, noise should be added to the better ear for masking when measuring the worse ear, so that the patient will not mistake the sound coming from the better ear through the skull as the sound heard in the worse ear. If the bone conduction thresholds of the two ears are different, noise masking should be added to the better ear when checking the bone conduction threshold of the worse ear.