Whether surgery is required for a deviated septum primarily depends on the clinical symptoms of the patient. Deviated septum is a common condition in otolaryngology, with over 90% of people having some form of septal deviation. It is mainly caused by abnormal development of the nasal septum during the embryonic stage or by later traumatic injuries, fractures, or pressure from nasal tumors causing the septum to deviate to one or both sides. After the septum deviates, it can lead to persistent nasal congestion and is also associated with pain in the eyes and face, and headaches. A deviated septum can also lead to complications such as sinusitis and nasal polyps. A detailed examination at a hospital, typically using an endoscope, can confirm the diagnosis. If a patient with a deviated septum experiences no symptoms, no treatment may be necessary. However, if the patient suffers from persistent nasal congestion accompanied by headaches, then localized corrective surgery may be required.