First of all, it is certain that a deviated septum is not cancerous. Deviated septum is a relatively common sign and most people have deviated septum, but not all deviated septum needs to be treated. Generally speaking, if the septal deviation is not very obvious and the patient does not experience any discomfort, no treatment is needed at this time. If the septal deviation is obvious, the nasal cavity on the side of the deviation will have repeated long-term nasal congestion, sometimes with nasal bleeding and migraine headaches, etc. In the long run, the inferior turbinate of the nasal cavity on the opposite side will have compensatory hypertrophy, which will lead to long-term nasal congestion on both sides. Long-term nasal congestion and open-mouth breathing are prone to colds and upper respiratory tract infections, and serious snoring can occur during sleep. In case of high septal deviation, it will obstruct the ventilation and drainage of the sinuses and may induce purulent sinusitis or fungal infection. If the deviated septum interferes with the ventilation and drainage of the eustachian tube, it may produce symptoms such as tinnitus and ear closure. If the above symptoms occur, only surgical correction of the deviated septum can make the symptoms relieved, and if there is an associated nasal polyp or turbinate enlargement, nasal polyp and turbinate surgery will be performed at the same time. There is no need to worry that the deviated septum will lead to cancer, because this situation does not exist.