The rectum is located at the end of the large intestine and is connected to the anal canal. Rectal cancer refers to the cancer between the dentate line and the junction of rectosigmoid colon, which is one of the most common malignant tumors in the gastrointestinal tract. With the continuous improvement of rectal cancer treatment methods, the treatment effect of rectal cancer has been greatly improved, and the prognosis of rectal cancer is more satisfactory if it can be detected early and treated early. However, early symptoms of rectal cancer are hidden and not specific, which can easily lead to misdiagnosis and omission. Some patients often consult the doctor only when the symptoms are very serious in the late stage due to the taboo to consult the doctor, which delays the diagnosis and treatment. Therefore, identifying the early symptoms of rectal cancer plays a very important role in the final treatment effect. Although the early symptoms of rectal cancer are relatively hidden and not very specific, if we can pay attention to some symptoms in the anorectal area, we can still achieve early detection. 1.Change of bowel habit. The frequency of stool changes from once a day to two or three times a day, and there is a feeling of incomplete stool after each stool; the shape of stool starts to change, such as from coarse to fine; stool becomes black or dark red, stool becomes thin and mucus; the number of bowel movements increases, but no stool can be excreted. 2.Mucus stool and pus and blood stool. When the cancer ruptures, the stool often contains bright red or dark red blood and mucus, and the stool is mixed with blood; there is pus and blood or mucus and blood in the stool, frequent stools or diarrhea and constipation alternately; the shape of the stool changes, becomes thin, flattened or with grooves. 3, anemia and wasting. As the disease progresses, patients with long-term blood in the stool and chronic wasting will develop anemia. Anemia often has its own causes, and rectal cancer is one of them. Patients with anemia tend to be pale, unable to work physically for a long time, and have palpitations after activity and other manifestations. 4.Abdominal pain and bloating. Patients with bowel cancer will have abdominal distension and abdominal pain due to intestinal obstruction, among which the incidence of abdominal pain is higher than the incidence of abdominal distension. The pain is mostly in the middle and lower abdomen, with different degrees of severity, mostly hidden pain or distension; 5. Alternating diarrhea or constipation. If there are symptoms such as alternating diarrhea and constipation, it may be because the growth of cancerous tumor affects the normal physiological function of the intestine, and then the possibility of cancerous transformation should be considered. 6. Repeated hemorrhoids that do not heal, unexplained anemia and weight loss, unexplained stomach distention and pain, persistent anal ulcers and anal pain. Once the above listed early symptoms of rectal cancer appear, you should go to hospital for examination as soon as possible.