There is no obvious harm in deviated septum surgery, but there is a possibility of septal perforation, hematoma and abscess, nasal collapse and other complications, but the probability of occurrence is low. 1. Nasal septum perforation: if the deviation is heavy, when separating the mucous membrane during the operation, excessive separation will cause unilateral or bilateral mucous membrane tear, and the more serious ones will have poor postoperative recovery, and there will be infections and so on, which can lead to nasal septum perforation. 2. Nasal septum hematoma: the blood is not completely stopped during the operation, and the filler is not taken out in time for review after the operation, which results in the accumulation of blood under the cartilage or mucous membrane, and forms the nasal septum hematoma; when the hematoma is secondary to serious infection, the pus accumulates repeatedly and forms the nasal septum abscess. 3. Nasal collapse: If the nasal septum is severely deviated and too much bone needs to be removed during the surgery, or if the nose is blown hard after the surgery, or if the stuffing is taken out earlier, it can cause deformity and collapse of the external nose. In conclusion, if a deviated septum surgery is needed, it should be evaluated by a professional doctor.