Tumors in the intestines are more serious and require timely consultation to determine the nature of the tumor and actively cooperate with the treatment. Intestines are divided into duodenum, small intestine, large intestine and rectum, no matter which section of intestines have tumors, if not treated in time, the consequences will be more serious. Duodenal papillary tumor is common in clinic, and the consequences are very serious, such as intestinal obstruction, jaundice, malnutrition, etc. Small intestinal tumors are less common, which often cause intestinal obstruction, gastrointestinal bleeding and other symptoms; colorectal tumors and rectal tumors are very common in clinic, which are often accompanied by bleeding in the stool, pus and blood stools, intestinal obstruction, difficulty in defecation, metastasis of tumors, wasting, malnutrition and other symptoms. No matter which section of the intestine has a tumor, it should be taken seriously, and it is recommended to consult a doctor in time for early diagnosis and treatment to improve the prognosis.