Nasal septum deviation washing is ineffective because the deviation is bony. Generally, nasal septum deviation occurs due to abnormal development of the nasal septum during the embryonic stage, or it is caused by trauma to the nasal septum or pressure from nasal cavity tumors later in life, resulting in deviation to one or both sides. After the deviation of the nasal septum, it primarily causes the patient to experience bilateral nasal congestion that progressively worsens. It is also accompanied by facial swelling, headaches, and the deviation itself can potentially trigger the onset of nasal polyps and sinusitis. First, it is necessary to go to the hospital for a detailed inspection using an electronic nasal endoscope and sinus CT to make a diagnosis. If patients with nasal septum deviation do not exhibit any clinical symptoms, generally no treatment is needed. However, if the patient's nasal congestion symptoms persist and worsen, accompanied by headaches, then corrective surgery for the nasal septum deviation is required to completely cure the condition.