Spitting up yellow sputum is not a sign of getting better, it may be a sign of aggravation of the condition, or a sign that the condition has not been effectively controlled. Coughing up yellow sputum mostly suggests that the patient’s respiratory tract has a bacterial infection, at this time to determine the degree of infection, for example, some patients with colds, acute bronchitis, before coughing up a little white mucus sputum, when it coughed up yellow sputum, more suggesting that the degree of respiratory infection is further aggravated. In addition, patients with bacterial pneumonia can still cough up yellow sputum or increase the amount of sputum when the inflammation in their lungs is not effectively controlled. Usually, when patients with respiratory infections do not cough up yellow sputum, or cough up yellow sputum to cough up a small amount of white mucus sputum, it is possible that the condition is improving, and such patients need to be combined with other clinical symptoms, blood tests, and chest X-ray in order to better and accurately determine whether the condition is improving or aggravating. Patients who cough up yellow sputum need to continue to be treated with anti-infective and expectorant therapy according to their condition.