When a five-year-old child has a cough with phlegm that is not good for a long time, parents are advised to take the child to the hospital for a detailed examination to clarify the cause of the cough, whether it is due to pathogenic bacterial infection without targeted treatment or due to a decline in the immune function of the child, and the specific treatment is as follows: a. If the cough is due to a specific pathogenic bacterial infection and no targeted treatment is given, it is necessary to improve the relevant auxiliary examinations and, if necessary If necessary, X-ray examination, or combined with drug sensitivity test, to clarify the specific pathogenic bacteria, so that under the guidance of doctors to give targeted treatment. If a decrease in immune function is considered, immune-boosting drugs should be applied to treat the condition if necessary. When you always have a bad cough, you should pay attention to whether the diet structure is reasonable, pay attention to a light diet, drink more water, feed regularly, avoid oral intake of spicy, stimulating and greasy food, and also do not take oral intake of hairy items such as fish, shrimp, eggs, beef and mutton, which can easily lead to aggravation of cough symptoms.