Coughing up yellow sputum is definitely good for the recovery of the respiratory system. Yellow sputum is often a bacterial infection that has occurred. When bacteria infect the mucous membrane in the respiratory tract, neutrophils or phagocytes in the body gather at the site of inflammation and engulf foreign viruses or bacteria, and as these cells undergo lysis and necrosis, yellow sputum is formed. If yellow sputum is actively coughed out, it is beneficial for the recovery of the infection; otherwise, these bacteria remain in the respiratory tract and can easily cause secondary infections, which is very detrimental to the recovery of the cough. In addition, if the amount of yellow sputum does not decrease, it is still necessary to use antibiotics for anti-infection treatment, such as oral cefradine or cefixime, and in the case of children, it is best to take pediatric cefixime granules. If there is a cephalosporin allergy, you can use roxithromycin or azithromycin for anti-inflammatory treatment, the effect is also better. In case of bronchiectasis, the amount of yellow sputum is high and treatment with postural sputum removal is needed every morning and evening.