Maxillary sinus cysts are benign cysts caused by obstruction of the sinus orifice, which are usually not malignant and do not affect the patient’s life expectancy. Maxillary sinus cysts are caused by poor drainage from the sinus opening and are generally classified as mucosal cysts and mucinous cysts. If a patient unintentionally finds a maxillary sinus cyst without any symptoms and the cyst is small in size, it can be temporarily observed without special treatment. If the cyst is large and compresses the surrounding tissues and the patient develops headache and other symptoms, then puncture and drainage treatment is feasible. If the result is not good, transnasal endoscopic sinus surgery or maxillary sinus radical surgery is feasible. At present, nasal endoscopic surgery is often chosen, which is less invasive and can achieve the purpose of drainage. Usually the patient is cured after surgical treatment and the life expectancy is not affected and the patient is no different from the normal person. In addition, patients need to take medication as prescribed by the doctor after surgery, and should avoid spicy and stimulating food in their diet. If the affected area becomes swollen and painful or red and itchy, the patient should go to the ENT department of the hospital for examination as soon as possible.