The Efficacy of Modified Olfactory Training Method for Patients With Post-viral Olfactory Dysfunction

Inclusion Criteria: 1. Age 18-80 years old, gender not limited. 2. Patients diagnosed with olfactory dysfunction following infections of the upper respiratory tract, as determined by Sniffin' Sticks test (including TDI value test). 3. Voluntarily signs the informed consent form. Exclusion Criteria: 1. Patients with post-traumatic olfactory dysfunction, rhinosinusitis-related dysfunction and olfactory dysfunction caused by other reasons. 2. Patients with concomitant sinonasal disease. 3. Patients with chronic diseases, such as hypertension, diabetes, bronchopneumonia, chronic obstructive pulmonary disease, etc. 4. Patients with serious coexisting diseases: such as malignant tumors, etc., with a life expectancy of less than 2 years. 5. Patients who cannot tolerate olfactory function testing and treatment. 6. Patients who have taken oral glucocorticoids, antibacterial drugs, anti-leukotrienes, antihistamines, or received olfactory training within four weeks will be excluded. 7. Patients who are receiving treatment that affects olfactory recovery. 8. Patients with smoking habits. 9. Patients who are already or plan to be pregnant. 10. According to the judgment of the researchers, the patient cannot complete this study or cannot comply with the requirements of this study (such as memory or behavior abnormalities, depression, heavy drinking, previous breach of contract). 11. Patients who did not consent for participating in the study.