Perennial loose stools may be caused by colorectal tumor, enteritis or irritable bowel syndrome. 1. Colorectal tumor: patients suffering from colorectal tumors, intestinal cavity occupying lesions, causing absorption abnormalities, causing the symptoms of perennial diarrhea and unshaped stools. 2. Enteritis: when the intestinal tract is infected by bacteria or viruses and other microorganisms, it can cause inflammatory diseases, prompting abnormal peristaltic movement of the intestines and stomach, which makes the stools not shaped, and there is the situation of perennial diarrhea. 3. Irritable bowel syndrome: the cause of irritable bowel syndrome is not yet clear, and may be related to immune and genetic factors. After suffering from this disease, the intestinal tract has high sensitivity, abnormal peristalsis, and diarrhea can occur when it is slightly stimulated by the outside world, causing perennial diarrhea and unformed stool symptoms. There may also be other causes, and the patient should go to the hospital in time for medical treatment.