Children wake up coughing phlegm caused by diet and disease, should improve the symptoms by improving diet and medication. 1. Dietary factors: spicy, stimulating, sweet and greasy food can easily lead to coughing up phlegm, so you need to improve your diet and eat less stimulating food. 2. Disease factors (1) Bacterial, viral and mycoplasma infections can cause respiratory diseases. For common cold, drink more water and do not use antiviral drugs. When the combination of bacterial infection can be used with antibacterial drugs such as cephalosporins, macrolides, etc., and macrolides are also more sensitive to mycoplasma infections. Tuberculosis often requires drugs such as isoniazid. (2) Other diseases: pleural tumor and pleurisy in pleural diseases. Cardiovascular disease in the left heart failure caused by pulmonary stasis. At this time, it is necessary to treat its original disease. Among the above factors, respiratory tract infection is common, which can be combined with drinking more water and parents patting the back to help expectorate sputum. In case of excessive phlegm, the combination of Ambroxol can be used to facilitate the expulsion of phlegm. Doctor’s advice is needed when taking the above medicines. If the symptoms of waking up with phlegm are present, the cause of the illness should be identified and the treatment should be standardized.