The most important reason for nose inaccessibility and smell is poor nasal ventilation due to chronic rhinitis, sinusitis or deviated nasal septum, nasal polyps, etc. The olfactory area is at the upper end of the nasal dorsum. When the air is not well ventilated, the smell will be impaired due to the lack of exposure to the smell. At this time, if we can find a way to open the airway, the air can reach the olfactory zone and improve the symptoms of diminished sense of smell. For rhinitis and sinusitis, you can consider taking oral rhinitis medications first, such as rhinitis capsules and nasal sprays, including coleus or rhinocort. If treatment is not effective, surgical treatment may be considered. Symptoms of nasal septal deviation and nasal polyps may also be considered under endoscopic surgery to improve nasal ventilation. The symptoms of nasal non-ventilation can be relieved by improving the symptoms of smelling.