Some patients present with cough with pale yellow sputum, which can achieve self-healing. Coughing up yellowish sputum is mainly common in mild purulent bacterial infection, causing inflammation of the respiratory tract, including acute upper respiratory tract infection, bronchitis, etc. At this time, patients pay attention to proper bed rest and have a light diet, can gargle with saline and rinse their throats, and when they have stronger resistance and do not have any other chronic diseases, they can heal completely on their own within 3-5 days and the yellow sputum will disappear. However, some patients have some underlying diseases due to poor resistance, such as chronic bronchitis, chronic bronchial asthma, or even bronchiectasis in themselves. After this time, due to the decrease of resistance and infection by septic bacteria, the symptoms may continue to worsen and require standardized medical interventions, such as suppressing cough, resolving sputum and giving antibiotics to achieve healing.