As we all know, we call the ability of the auditory organ to perceive sound as hearing, and the clinical evaluation of good or bad hearing is to find a standard that can be regulated by a number, and this is the role of “hearing threshold”. The patient’s hearing loss is more than 30dB, that is, the hearing threshold of the frequency has increased by 30dB, can be diagnosed as deaf. If the noise is very strong and the peak of the spectrum changes a lot, jumping up and down, etc., the hearing threshold will rise. So, what tests are needed to confirm the diagnosis of rising hearing threshold? Here is a brief introduction: 1. Endoscopic examination: There are more causes of deafness, including conductive, inductive, and mixed. Different etiologies are treated differently. Endoscopy is an optical instrument with good illumination and high definition, which can clearly see the narrow area that cannot be seen by the naked eye, frontal mirror, and is used to examine the lesion in the ear well. 2.Acoustic impedance electromyography: Acoustic impedance electromyography is used to check the patient’s hearing damage, and can initially determine the type of hearing damage and lesion site. 3.Laboratory examination: including blood picture, blood sedimentation, platelet count, prothrombin time, trace element quantity and so on. Anemia or micronutrient deficiency can easily cause hearing loss. 4, vestibular function examination: vestibular function examination, also known as balance function examination, is a method to infer the degree and location of vestibular lesions by observing the spontaneous signs caused by vestibular system lesions.