It is not possible to generalize about how many days it takes to recover the sense of smell in neocoronavirus pneumonia. Some patients may recover in 1~2 weeks, while others may take 1~2 months to recover, and a few patients may not be able to recover their sense of smell permanently, and the effect of neocoronavirus pneumonia on the sense of smell function has yet to be further observed. One of the symptoms of Pneumocystis carinii pneumonia is loss of or loss of sense of smell. For some mild cases, the symptoms of Pneumocystis carinii pneumonia may gradually improve after 1 to 2 weeks as the disease improves, while others may take 1 to 2 months to recover, and some may experience permanent loss of the sense of smell. Decreased or loss of smell may be related to obstruction and inflammation of the nasal cavity leading to decreased sensitivity of the olfactory receptor area to external stimuli, damage to the sensory epithelium in the olfactory region, and damage to the olfactory conduction pathway, thus rhinitis, influenza, upper respiratory tract infections, nasal polyps, and sinusitis can all lead to decreased or loss of the sense of smell. If you are diagnosed with novel coronavirus pneumonia and have symptoms of decreased or loss of smell, please follow your doctor’s instructions for treatment. Note: In this article, the terms “new coronavirus pneumonia” and “new coronavirus pneumonia” were renamed to “new coronavirus infection” on December 26, 2022, as announced by the National Health Commission.