The presence of an itchy throat and yellow phlegm indicates a purulent infection of the throat, which is an infection caused by bacteria. When bacteria infect the throat, there will be congestion and edema, along with inflammation, and also secrete a lot of inflammatory exudate, and the neutrophils and phagocytes in the body will gather in the throat to devour foreign bacteria, and then these cells will undergo lysis and necrosis, and mixed with inflammatory exudate, forming yellow sputum, and generally bacterial infection is the phenomenon of yellow sputum. The use of antibiotics for anti-inflammatory treatment is more effective, such as cephalosporin antibiotics if there is no allergy, it is recommended to take oral cefixime, cefaclor, cefradine for treatment, if there is also no allergy to penicillin, you can also use amoxicillin, amoxicillin clavulanic acid potassium for anti-inflammatory treatment, the effect is better. If there is a serious case of septicemia and a particularly high body temperature, it is best to treat with intravenous drip antibiotics.