Rectal cancer refers to cancer between the dentate line and the junction of rectosigmoid colon, which is one of the most common malignant tumors of the gastrointestinal tract. The median age of incidence of rectal cancer in China is around 45 years old, and the incidence rate of young people has been on the rise in recent years. Nowadays, many people pay more attention to the early symptoms of rectal cancer, because many rectal cancers are in the middle and late stages when they are discovered. The main incidence age of rectal cancer lies in middle-aged men above 40, and in the early stage, there are often an increase in the number of stools, mucus and pus-blood stools (as the only early symptom about 85%), but these cases are often misdiagnosed as dysentery and enteritis, leading to further development of the disease and worsening of the symptoms of blood in stool, and when the diagnosis of rectal cancer is late, the best treatment is missed. When the symptoms of rectal cancer are diagnosed, the best time for treatment has been missed. After a lot of clinical observation, doctors have summarized 5 symptoms, which can be regarded as danger signals of rectal cancer: 1. mucus stool and pus stool When cancer ruptures, the stool often contains bright red or dark red blood and mucus, and the stool is mixed with blood. 2. 2.Changes in bowel habits The number of bowel movements changes from once a day to two or three times a day, and there is a feeling of incomplete bowel movements after each bowel movement. 3. Alternating diarrhea or constipation If there are symptoms such as alternating diarrhea and constipation, it may be because the growth of cancer tumor affects the normal physiological function of the intestine, and the possibility of cancer should be considered. 4.Abdominal pain and distension Patients with intestinal cancer will have abdominal distension and abdominal pain due to intestinal obstruction, among which the incidence of abdominal pain is higher than that of abdominal distension. The location of pain is mostly in the middle and lower abdomen, and the degree of pain varies, mostly hidden pain or distension. 5. Anemia and wasting As the disease progresses, patients may develop chronic wasting symptoms, such as anemia, wasting, weakness and fever, and even cachexia, often accompanied by fatigue and unexplained sudden weight loss, associated with blood in stool, insufficient intake and excessive consumption. If you have the above symptoms, you should go to hospital for the following examinations in time: 1.rectal finger examination is the necessary examination step to diagnose rectal cancer, about 80% of rectal cancer patients can be found to have hard and bumpy masses through natural rectal finger examination; in advanced stage, the narrowed intestinal lumen masses can be palpated and the fixed finger sleeve can be seen to contain fecal filthy pus and blood. 2.Proctoscopy can see the size and shape of the tumor and can directly take the intervening tissue for pathological examination. Note: Rectal cancer mostly occurs in middle-aged and elderly people, and its incidence in young people has increased significantly in recent years, so you should be alert to colon and rectal cancer when you have a change in stool habit, increased stools or unexplained mucus, pus and blood stools, unexplained low fever, night sweats, anemia or chronic intestinal obstruction. If relevant symptoms appear, you should go to hospital for examination in time. Before a clear diagnosis is made, you should not treat the disease as enteritis or dysentery for a long time to avoid delaying the diagnosis.