Left maxillary sinus cyst can be treated with regular follow-up, medication and surgery according to the condition. 1. Regular follow-up: If the left maxillary sinus cyst is relatively small and has no abnormal manifestations, it can be followed up regularly without any special treatment, and is usually reviewed once every 6-12 months. 2. Medication: If the left maxillary sinus cyst is combined with infection, it can be treated with antibiotics first, such as cephalosporin antibiotics, azithromycin, etc. The left maxillary sinus cyst can be treated with antibiotics first. Suffering from maxillary sinus cyst can also take vitamin C, can enhance the body’s immunity, can be to a certain extent to slow down the development of the disease. 3. Surgery: The main treatment for left maxillary sinus cyst is surgery. Commonly used surgical methods include traditional surgery, simple nasal endoscopic surgery, nasal endoscopy combined with the lower nasal passages open window surgery and so on. When suffering from left maxillary sinus cyst, you need to go to the hospital in time for examination and follow the doctor’s instructions to standardize the medication and treatment, so as not to delay the condition.