Precautions after nasal endoscopy [during hospitalization and after surgery]: 1. Fasting and drinking for 6 hours after general anesthesia surgery to prevent asphyxia caused by vomiting. 2.After local anesthesia and 6 hours after general anesthesia, semi-liquid diet (such as thin rice, milk, milk powder, noodle soup, etc.) and semi-sitting position are recommended. 3.After the removal of nasal gauze, change to normal diet, but avoid stimulating food (such as fried, deep-fried, spicy and hot food). 4, 1 to 2 days after surgery to remove the nasal blockage gauze, the nasal cavity is filled with gauze during the dry mouth, it is appropriate to drink a small amount of warm water several times. 5.Do not spit hard after surgery, avoid coughing and sneezing, if you have coughing or sneezing aura, please open your mouth and breathe deeply or hold the tip of your tongue against your palate, meanwhile, do not remove the nasal stuffing gauze by yourself to prevent active bleeding in the nasal cavity. 6.Ice packs on the forehead for 6 hours will help to reduce headache and bleeding. 7.After local anesthesia and 6 hours after general anesthesia, rinse the mouth with Dopey’s liquid before and after eating and pay attention to oral hygiene. 8, a few days after surgery, there may be a little blood oozing from the nasal cavity and a little blood in the sputum; during the period of nasal gauze filling (24-48 hours), there may be mild headache, nasal distension and tearing. These are normal phenomena, but if there is eye pain, visual acuity down. However, if you have eye pain, decreased vision, eye movement disorder, etc., you should tell the doctor and nurse in time. [Precautions after discharge]: 1. Rinse your own nasal passages for at least three months. No rinsing is required on the day of follow-up examination to prevent bleeding. 2.Post-discharge follow-up a. Review at the ENT department of the outpatient building once a week for 3~4 times after discharge; b. Change to once every 2 weeks for 1 month after discharge according to the condition of the operated cavity; c. Change to once every 3~4 weeks for 2 months after discharge according to the condition of the operated cavity; d. General routine follow-up for more than 3 months. 3.Application of corticosteroid nasal spray after discharge, such as Cochlear, Endosulfan, Rayocort and other drugs, helps to prevent recurrence of sinusitis nasal polyps, at least 3 months. Nasal application of oils, such as compound peppermint oil, etc., can soften the crusts and facilitate their discharge.