Watermelon is rich in vitamins and water, cold cough phlegm can eat watermelon, take to moderate, try to avoid eating refrigerated watermelon. However, watermelon does not have the function of treating colds and coughing phlegm. Watermelon is rich in vitamins, amino acids, glucose and water, cool and quench thirst, cold cough phlegm can eat watermelon during. Watermelon sugar is high, patients with diabetes or abnormal glucose tolerance to avoid excessive, refrigerated watermelon should also be placed at room temperature after taking, to avoid too cold food to stimulate the mucosa of the airway caused by coughing, coughing and phlegm aggravation. But watermelon is just a food, no treatment of disease efficacy, cold cough phlegm symptoms serious need to identify the cause of the disease, give oral phlegm drugs such as aminobromine, anti-infective drugs such as cephalosporin, penicillin treatment. The cold cough sputum is recommended to consult a doctor in a timely manner, under the guidance of a specialist physician to the cause of the treatment.