The thickening of intestinal wall after colon cancer surgery may be formed after local edema, or it may be the recurrence of tumor. It is usually caused by edema at the anastomosis or edema around the anastomosis, including local edema and thickening, and there may even be exudate and effusion around the anastomosis, etc. This is a normal phenomenon, and the local edema can gradually subside after the disease recovers, the nutritional status recovers, and the albumin basically recovers to normal level. At the same time, it may also be formed after tumor recurrence or metastasis, especially in the process of regular follow-up after surgery, if local intestinal wall thickening can be found in abdominal CT or intestinal wall thickening is found in colonoscopy, it should be considered as possible recurrence and further pathological examination is needed.