After gallbladder removal, colon cancer can be prevented by improving dietary habits and regular checkups, and when abnormalities in the digestive tract are detected, one should consult a doctor in time. In terms of dietary habits, one should avoid eating too much high-fat food, and eat more fiber-rich vegetables, which can accelerate the peristaltic movement of intestines to speed up defecation, avoiding the accumulation of stools in the colon for too long, thus resulting in constipation, which can further induce colon cancer. Bleeding caused by ruptured colon cancer tumor will be mixed into feces and lead to positive fecal occult blood. Once the examination is positive for fecal occult blood, patients should consult doctor for colonoscopy in time. It can not only observe whether there are lesions in intestinal tubes, but also take biopsy of suspected intestinal tubes and carry out pathological test for clear diagnosis. Early diagnosis and treatment can greatly improve the prognosis of the disease. After the operation, patients should maintain regular dietary habits, quit smoking and drinking, exercise appropriately, and if any discomfort is found, consult a doctor in time to avoid delaying the condition.