Bleeding in the stool after cardiac stenting is considered to be due to a decrease in the coagulation function of the body due to anticoagulant drugs used after cardiac surgery, as well as some underlying diseases in the intestines, including hemorrhoids, anal fissures, colorectal tumors, colorectal diverticula and colorectal ulcers. The bleeding in the stool after heart surgery should be examined by a specialist for a preliminary determination, and a colonoscopy is also needed to get a comprehensive understanding of the intestinal tract. Reduce the use of anticoagulant drugs, adjust the dose, and provide timely treatment for colorectal cancer and other underlying diseases, which is the only way to get patients through, otherwise the bleeding may continue and cause anemia, which may be life-threatening in severe cases.