Nasal septum deviation is a relatively common otolaryngologic condition, which may present clinical symptoms. The extent of these symptoms largely depends on the degree of the deviation and the individual's personal sensitivity. If the deviation is mild and not severe, it might not show any obvious symptoms and is usually discovered during physical examinations or nasopharyngoscope evaluations. Additionally, it may be accompanied by related clinical symptoms such as nasal congestion, nosebleeds, headaches, dizziness, and a decrease in the sense of smell. If these clinical symptoms occur, it is necessary to undergo nasopharyngoscopy and sinus CT scans to assess the specific degree of nasal septum deviation. Some patients may require surgical treatment.