If there is phlegm all the time after the flu is over, it may be a combination of respiratory diseases, such as acute bronchitis and pneumonia. It is recommended to pay attention to the care of life and diet, and give medication if necessary. 1… Pay attention to the care of life and diet: if you keep having phlegm after getting well from cold, it is recommended to pay attention to the diet in general and reduce the intake of stimulating food to avoid the worsening of coughing symptoms. Improve bad habits, such as smoking, drinking and staying up late. It is recommended to increase the amount of drinking water, pay attention to the supplement of fresh fruits and vegetables, maintain indoor air circulation, increase exercise to improve the body’s immunity, conducive to recovery. 2. Targeted treatment: It is recommended to make a clear diagnosis, combined with the doctor’s advice, when there is evidence of bacterial infection, cefaclor, amoxicillin, levofloxacin and other active anti-infective treatment, but allergic to the drug is prohibited. For phlegm is thick and not easy to cough out can be used Ambroxol oral solution, can help reduce symptoms. There may be other causes for the phlegm after the cold has subsided, and prolonged coughing requires further investigation of other possible causes to avoid missing the diagnosis, and if it fails to recover over a long period of time, it is recommended that it be adjusted under the guidance of a doctor. The above medications should be used under the supervision of a physician.