Coughing up yellow sputum usually does not mean that the disease is about to be cured, on the contrary, it usually means that there is a combination of bacterial infection, which needs active treatment. 1. Clinically, infectious diseases are very common, including bacterial infections, viral infections, fungal infections, etc. For the respiratory system, yellow sputum usually means the presence of bacterial infections, which can be secondary, or aggravation of the original bacterial infections. 2. Coughing up yellow sputum usually means that the disease has not been effectively controlled, and requires active anti-infective treatment, often supplemented by a series of treatments such as sputum expectoration, sputum, and if necessary, sputum culture can be carried out to clarify the type of infectious strains, so as to choose the targeted antibiotics. When yellow sputum is coughed up, it is recommended to consult a specialist for regular treatment.