If sputum is found to gradually change from yellow sputum to white foamy sputum, in most cases it indicates that the condition will gradually improve, indicating that the inflammation is under control and that other symptoms will often be reduced. For example, if there is a fever, the fever will go down, the cough will be reduced, and the amount of sputum coughed up will decrease. At this time, you can continue to take oral cough and phlegm medicines and effective antibacterial drugs, mainly to consolidate the disease for a few days to prevent recurrence. It is also necessary to pay attention to diet and rest. In this case, the resistance is still weak, and the digestive function of the stomach is also poor, and it has not fully recovered. You need to pay attention to a light diet, try to eat easily digestible food, do not overwork, and try not to stay up too late, if you do not pay attention to the case may also be a relapse.