Yellow runny nose is caused by viral or bacterial infection of the nasopharynx. The action of bacteria and viruses causes the mucous membrane of the blood vessels in the nasopharynx to dilate, resulting in extravasation of fluid from the blood vessels. In this case, we should actively use anti-cold drugs and anti-inflammatory drugs, such as cold and fever granules, Banlangen granules, and penicillin or cephalosporin antibiotics. During the treatment period, you must pay attention to drink more water, eat more green vegetables and fruits so as to promote faster metabolism and recovery from the cold, and avoid staying up late.