Most of them may be caused by external factors such as bacteria, viruses or fungi, causing swelling of nasal mucosa. In addition, it is also related to anatomical factors. If the nasal sinus ostium complex of the nasal cavity is structurally blocked or has nasal polyps and other new organisms blocked, it will also cause sinusitis. At this time, surgery is needed. In addition, it may also be related to the surrounding environment, genetics, immune system and other factors. Therefore, if there is frequent discharge of pus and mucus, it is still necessary to go to the hospital to find out the cause. The above health science knowledge is for reference only.