Yellow fluid from the nose, the first thing you need to do is to go to the hospital to check the sinus CT, because there are two causes: the first is maxillary sinus cyst, which is the occurrence of cysts due to blockage of the mucous membrane of the sinuses, which can cause the patient to have intermittent yellow fluid in the nose, in the form of egg white, and the sinus CT can make a clear diagnosis. If the yellow fluid is occasional, it indicates a ruptured cyst, a condition that does not require surgical treatment. However, in case of recurrent cyst rupture, surgical treatment is required. Surgery requires complete removal of the cystic membrane as well as the cystic skin, often using maxillary sinus radical surgery. The second is the symptoms associated with chronic rhinitis attacks. As the inflammatory infection invades the mucosa of the sinuses, causing congestion, edema, and inflammatory exudation of the sinus mucosa, the patient will experience symptoms related to yellow nasal discharge, nasal congestion, and headache. Sinusitis requires surgical treatment, which can be performed by nasal endoscopic sinus mucosal clearance as well as open surgery, which requires hospitalization and can be cured in about a week.