Early stage of bowel cancer may not have blood in stool, and the performance of patients varies according to their physique. Early stage of bowel cancer may not have obvious symptoms or may have blood in stool, mainly because the cancer cells divide and proliferate and invade the patient’s intestinal blood vessels, causing damage or rupture of intestinal blood vessels causing intestinal bleeding. Symptoms may vary depending on the patient’s condition. As the disease progresses, patients may also have adverse conditions such as mucus stool, abdominal distension and pain, loss of appetite and rapid weight loss. If the patient has blood in the stool, it may also be caused by peptic ulcer, hemorrhoids, anal fissure and other factors. It is necessary to seek medical treatment in time to improve the relevant examination, to clarify the cause of the disease and then actively carry out treatment to avoid aggravation of the condition.