It takes about 2-3 days for rice particles to enter the nasal cavity and start to deteriorate and decay. Because there are a large number of bacteria in the nasal cavity, bacteria can decay and multiply on top of the rice grains, and the bacteria will produce local inflammation after multiplying continuously. Patients with rice grains stuck in the nasal cavity may experience local discomfort, and if secondary infection occurs, symptoms similar to sinusitis may occur. If a rice grain enters the nasal cavity, the patient should go to a quinturology clinic as soon as possible and have the foreign body removed under the guidance of a quinturology doctor. Patients with sinusitis should pay attention to avoid colds and cold, and avoid repeated upper respiratory infections, such as pharyngitis, bronchitis, pneumonia and other related diseases. Usually, you should pay attention to minimize swimming to avoid swimming water into the sinuses and induce sinusitis aggravation.