Abnormal stool is often the first clinical symptom of some intestinal tumors, so it is important to pay attention if it occurs. The most common ones are change in bowel habit and nature of stool. For example, frequent constipation, anal pain, unclean stool, mucus stool, blood in stool, etc. The above changes caused by intestinal tumor usually worsen as the primary tumor continues to progress. In severe cases, the bowel movement can be more than 10 times a day, or accompanied by persistent post-poo incompletion, or even anal incontinence with mucus and foul-smelling pus and blood. When the tumor invades the intestinal canal and circumferential, it will cause incomplete intestinal obstruction. At the initial stage, it will show that the frequency of bowel movement increases, but the volume of each bowel movement decreases, or the shape of formed stool changes, becomes thin or irregular, with blood and mucus at the same time, and blood and stool are mixed, and the color is dark, accompanied by purulent mucus, and complete intestinal obstruction may appear when the stenosis is heavy at the later stage. The most common one is hemorrhoid, which is caused by the bleeding of the veins around the anus, and the blood dripping down with the stool is mostly fresh blood, and the blood is not mixed with the stool, and most of them do not have mucus adhesion. The blood in the stool caused by rectal polyps is also mostly fresh blood, which is covered on the surface of the stool and does not mix with it. When polyps are combined with ulcer infection, there may be mucus and blood in the stool and a feeling of urgency.