Unformed stools for 10 years are not necessarily malignant. The occurrence of intestinal tumors is related to factors such as heredity, diet, disease and disease course. 1. Heredity: for some people with family history of intestinal tumor, the probability of intestinal tumor is higher than the general population. 2. Diet: Long-term consumption of irritating foods such as frying, deep-frying and spicy food can easily trigger the occurrence of intestinal diseases, and certain diseases can further develop into tumors. 3. Diseases: such as intestinal polyps, ulcerative colitis and other diseases are likely to develop into intestinal tumors. 4. Disease duration: for diseases with longer disease duration, the possibility of malignant changes will increase. It is recommended that patients with irregular bowel movements should go to the hospital in time to improve the relevant examinations, make a clear diagnosis, and take active treatment.