The 45-year-old Mr. Zhang suffered from otitis media as a child, leaving a legacy of tympanic membrane perforation. A few days ago, he went swimming in the pool because of the heat, and the next day he had pus in his ear. Mr. Zhang went to the Department of Otolaryngology at the Chinese Hospital and was examined by Dr. Chen Zhaoyuan, who found that the water from the pool had entered his middle ear with bacteria through the perforation of the eardrum, causing otitis media. Chen reminds people who have had otitis media and have a perforated tympanic membrane to avoid swimming as much as possible, and to pay attention to preventing water from entering the ear when bathing. Ear wax and ear check before swimming 7-year-old Jun Jun went to learn swimming in the summer, but after just one session of learning in the water, he went to the hospital with ear pain. The doctor found that the cerumen (i.e. earwax) had grown large after being soaked in the pool water, completely blocking the outer ear canal and causing a bacterial infection, medically known as cerumen embolism and otitis externa. Chen Zhaoren recommends that parents take their children to the hospital to have their ears checked before they learn to swim and clean up the cerumen in time, but don’t clean it up too much. The 25-year-old Mr. Cai choked on water when swimming a few days ago and blew his nose hard, instantly feeling a rush of air from the nasal cavity to the heart of the ear, and the next day there was earache and tinnitus. The next day, he had ear pain and tinnitus. When he went to the ear department for an examination, it turned out that improper nose blowing had triggered otitis media. Chen Zhaoyuan reminded that the human nasal cavity and the ear have a connected cavity called the eustachian tube, nasal choking after forceful nose blowing will lead to bacteria from the eustachian tube into the middle ear cavity causing otitis media. Therefore, the correct practice after choking should be to hold one nostril, gently blow the water outward (do not pinch two nostrils at the same time to blow hard), or backward suction to the mouth and then spit out. Experts remind a. Patients who have recently undergone ear surgery such as tympanic tube placement and tympanotomy should not swim; b. Patients suffering from cold, sinusitis, chronic otitis media and tympanic membrane perforation should not swim temporarily; c. Try not to do diving and other actions to avoid choking; use ear plugs for swimming to prevent water in the ear canal; use nose clips to prevent choking; d. If you find nasal or ear discomfort while swimming, you should temporarily If you do not get relief, seek medical attention promptly; v. After going ashore, bend your head sideways and jump on one foot to exclude the water in your ear and keep it dry.