Cochlear entrapment actually refers to the entrapment of the eardrum. The entrapment of the eardrum is mainly due to the fact that the duct between the nose and the ear (i.e., the eustachian tube) is not open, and the atmospheric pressure outside is higher than the atmospheric pressure in the middle ear cavity, which will press the eardrum toward the middle ear cavity, and the situation of entrapment of the eardrum will occur. In this case, it is usually used some drugs that promote the patency of the eustachian tube, such as Chenault or Genotone, which can promote the discharge of secretions in the eustachian tube, thus promoting the patency of the eustachian tube. In addition, sometimes it is necessary to use some nasal spray, because the eustachian tube mouth is at the back end of the nasal cavity, using nasal spray can reduce the edema of the eustachian tube mouth, the eustachian tube is open, this kind of tympanic membrane invagination situation is relieved. Sometimes, the eustachian tube is not accessible due to the nasopharyngeal swelling compressing the eustachian tube, and further examination of the nasal endoscope is needed to see if there are new organisms in the nasopharynx.