Olfactory disorders can be caused by rhinitis, neoplastic organisms, and damage to the olfactory nerve. It can be treated by medication, surgery, etc. 1. Rhinitis: Some patients with rhinitis are suffering from middle and lower turbinate hypertrophy and swelling of nasal mucosa, which leads to narrowing of the nasal cavity and severe nasal congestion, making it difficult for external odors to enter the olfactory region, resulting in decreased or loss of sense of smell. At this time, patients can choose to be treated with decongestants under doctor’s guidance, such as furosemide nasal drops and seroquel hydrochloride nasal drops. 2. Proliferative organisms: If patients are found to have nasal polyps, nasal papillomas and other proliferative organisms that block the olfactory region and cause symptoms, functional endoscopic nasal surgery is generally used to remove the proliferative organisms. 3. Damage to the olfactory nerve: the olfactory nerve is the sensory nerve of smell. When the brain is damaged in an accident, the small olfactory nerve fibers may be partially or completely torn off, resulting in decreased or loss of the sense of smell. Medications that nourish the nerve, such as methylcobalamin, may be taken. If the sense of smell is completely lost and you are unable to smell any odors, this condition may not be recoverable and the olfactory nerve may be completely damaged. The occurrence of smell disorder may also be caused by the lesion of the olfactory center, you should go to the regular hospital in time to identify the cause of the disease, under the guidance of professional doctors, standardized medication and treatment.