The appearance of a very yellow nasal discharge indicates that a serious bacterial infection has occurred in the nasal cavity. When the infection occurs, the nasal cavity will secrete a lot of inflammatory exudate, and the neutrophils and phagocytes in the body will gather at the inflammation site to engulf the foreign bacteria, and then the neutrophils and phagocytes will undergo lysis and necrosis, and mix with the inflammatory exudate to form the yellow nasal mucus. It is often a characteristic manifestation of bacterial infection, so it must be treated with antibiotics for better results. The nasal infection belongs to the upper respiratory tract infection, if there is no penicillin allergy, you can take oral amoxicillin or amoxicillin clavulanic acid potassium for treatment, the effect is relatively good. If there is allergy to penicillin, you can use cephalosporin antibiotics, the effect is also relatively good, such as cefixime, cefaclor, cefradine, cefadroxil, cefadroxil, cefadroxil, cefadroxil are effective anti-inflammatory drugs. If there are also allergies, it is recommended to use levofloxacin or azithromycin to carry out treatment.