The treatment of a deviated septum to the left depends first on whether the degree of deviation is causing clinical symptoms. Because almost everyone’s septum is somewhat deviated, only the degree of severity is different. If the clinical symptoms related to nasal congestion, headache and rhinorrhea have already appeared in general, the first thing that needs to be treated conservatively with medication is to apply the nasal spray medication Nesuna and Renolcort; oral rhinitis medication Canglizi Rhinitis Drops and Nasal Yuanshu Oral Liquid. When the clinical symptoms disappear after improving nasal congestion, it can be treated conservatively, but if the symptoms of oral medication do not improve significantly, endoscopic surgery can be considered.