1, bloody stool is common, and it is the earliest symptom, and some people may only show a small amount of bleeding. The stool is bloody, and some patients may have mucus with bloody stool, feeling that there will be purulent secretions in the stool, which can sometimes be confused with enteritis;

2. Abdominal pain: Some patients have persistent dull pain with unclear positioning, and the stomach also has dull pain or feels a little bloated, which is related to the increase of gastrointestinal peristalsis and spasm. In severe cases, it can be manifested as abdominal cramps. In more serious cases, some patients may have typical incomplete intestinal obstruction, such as nausea and vomiting. This situation is more common in the elderly, so we should be alert to the possibility of colorectal cancer;

3. Changes in defecation habits: Generally, normal people defecate 1-2 times a day. If the frequency of defecation increases or personality changes, for example, once a day/kloc-0 times, now I don't know why it suddenly becomes 3-4 times; Sometimes constipation can't discharge stool, and sometimes it will suddenly have diarrhea. Be vigilant when this happens;

4, severe patients may have anemia, patients should go to the hospital in time to further make a clear diagnosis, especially pay attention to exclude the possibility of intestinal cancer.