Effusion in the ear is a symptom of secretory otitis media, mainly due to cold, flu, rhinitis and other reasons that cause the eustachian tube to be incompetent, resulting in an increase in negative pressure inside the tympanic chamber, which causes the mucous membrane to continuously exude, thus producing effusion. The treatment methods are as follows: 1. You can repeatedly swallow saliva or open your mouth wide similar to yawning to promote the opening of the eustachian tube. 2. Pinch your nose and puff to open the eustachian tube with air pressure, thus relieving the symptoms. 3. You can press the ear screen and perform tympanic membrane massage to promote the opening of the eustachian tube and discharge the fluid. 4. You can take oral glucocorticoids such as prednisone to reduce mucosal edema and reduce intra-drum exudation. 5. Amoxicillin and other antibiotics to treat infection, and nasal spray of fluticasone propionate and other nasal glucocorticoids to reduce mucosal edema in the nasal cavity, which can open the eustachian tube. If the above methods are ineffective, it is recommended to perform tympanocentesis in a timely manner, and tympanic tube placement is feasible for those who do not recover after a long time.