Loss of sense of smell, which is categorized into sensory and obstructive, needs to be treated according to the cause, such as olfactory nerve atrophy can be restored to the olfactory nerve, nasal polyps as well as deviated septum can be restored to the sense of smell through surgical treatment. 1. Sensory olfactory loss: olfactory neuritis, atrophic rhinitis, upper respiratory tract viral infection, olfactory center atrophy, anterior skull base occupying lesions. According to different diseases, anti-inflammatory, anti-infectious, nutritive nerve’, tumor resection and other treatments can be given. 2. Obstructive hyperosmia or loss of sense of smell: nasal polyps and deviated nasal septum: deviated nasal septum can affect the gas to reach the olfactory region, causing olfactory obstruction, which can be corrected by nasal septum mucosal correction under nasal endoscopy to improve the sense of smell. Nasal polyps, a space-occupying lesion in the nasal cavity, can also affect the gas to reach the olfactory region. Surgical removal of nasal polyps can be performed to promote the recovery of the nasal mucosa in order to restore the sense of smell. Loss of sense of smell may also be due to other reasons, you should go to the hospital to clarify the cause of the disease, under the guidance of professional doctors for treatment.