Generally speaking, it is better to cough up yellow phlegm. Yellow sputum often indicates the presence of bacterial infection, when bacteria infect the mucous membranes of the respiratory tract, the body’s neutrophils gathered in the inflamed area, phagocytosis of foreign bacteria, cells phagocytosis of pathogens after the death of the formation of yellow sputum. Therefore, yellow phlegm coughing out is conducive to the removal of bacteria and cellular tissue necrosis, to avoid further aggravation of infection and inflammatory reaction. Coughing up yellow sputum patients need to supplement the body’s nutritional needs, to high protein, high vitamin, light and easy to digest diet is appropriate, try to avoid eating stimulating food. Avoid excessive fatigue, moderate exercise, enhance physical fitness, develop good habits, do not smoke and do not drink alcohol. Keep a good mood, avoid excessive worry, tension and other bad emotions. Cough yellow sputum and other discomforts, it is recommended to go to the hospital in time to identify the cause of the disease, and follow the doctor’s instructions to standardize the treatment.