Colon cancer is a common malignant tumor in the digestive system. Generally speaking, it is a normal phenomenon that the stool becomes thin after colon cancer surgery, and this symptom usually disappears in about two weeks, and the stool will return to normal. It may also be related to doctor’s operation, intestinal adhesion and other conditions. In most cases, thinning of stool is a normal phenomenon because the digestive system is rebuilt and the organism needs to adapt before the intestinal function is restored. In diet, pay attention to light diet, choose more easy-to-digest food, and don’t eat spicy and stimulating food, etc. Stool thinning after surgery of colon cancer patients may be related to doctor’s operation, some patients have larger wounds and slow healing. If the patient’s stool becomes thin and even has abdominal pain and bloating, it may be related to intestinal adhesion, go to the hospital for colonoscopy in time and use anti-inflammatory drugs, such as amoxicillin capsule, etc. as instructed by doctor.