The eardrum is the diaphragm between the middle ear and the external ear canal (as shown on the right). As the name implies, the eardrum is like the drum skin of a musical instrument. When the human eardrum is broken, hearing is affected, and the larger the perforation, the worse the hearing. In addition, the tympanic membrane isolates the external germs and plays the role of a gateway. If the tympanic membrane is broken, external germs can easily infect the middle ear, and if there is a slight cold or flu, there will be pus, or headaches and stuffy ears, which doctors call recurrent middle ear infections. In middle and old age, it is obvious that the hearing of the affected ear is very poor, but the tissue healing ability of the elderly is poor, and the success rate of surgical repair is not as good as that of the young. Therefore, tympanic membrane perforation should not be left unattended and should be treated with active surgery.