Whether or not you can eat watermelon after surgery depends mainly on the site of surgery as well as the recovery. Clinical surgery mainly includes two major categories: First, surface surgery, such as thyroid surgery, breast surgery, inguinal hernia surgery, varicose vein surgery and other non-gastrointestinal surgery, post-operative anesthesia awakening, usually six hours to eat, so the patient can eat watermelon; Second, intra-abdominal gastrointestinal surgery, such as the gastrointestinal tract, especially gastrointestinal tumors in the tumor radical resection, gastrointestinal reconstruction, etc., after surgery, 3-5 days to recover defecation, defecation, can eat a liquid, semi-liquid diet, at this time can eat a small amount of watermelon. 5 days before resumption of defecation, exhaust, in order to eat a liquid, semi-liquid diet, at this time a small amount of watermelon, need to pay attention to the combination of diabetes underlying disease patients try not to eat watermelon, because watermelon contains high sugar, easy to affect the healing of the operation.