Patients with long-term diarrhea and unformed stools, consider the existence of chronic intestinal inflammation, functional changes in the intestinal tract, intestinal organic changes, which may be caused by a variety of reasons, commonly caused by ulcerative colitis, irritable bowel syndrome, intestinal tumors, etc. It is recommended that patients promptly go to the hospital to clarify the cause and carry out targeted treatment: 1. The typical manifestation of ulcerative colitis is a change in the nature of the stool, and as a chronic organic lesion, if patients do not actively treat, or do not care will appear long-term diarrhea stool is not shaped, stool characterized by mucus-purulent stool, some patients can also be accompanied by abdominal pain, fever, malnutrition and other symptoms, it is recommended that patients promptly seek medical attention to avoid affecting daily life; 2, irritable bowel syndrome: usually caused by gastrointestinal dysfunction. It is a common functional bowel disease characterized by abdominal pain with changes in bowel habits without organic lesions. As the typical performance of irritable bowel syndrome patients receive external stimuli (such as unclean diet, cold, mood swings, etc.), there will be diarrhea, abdominal pain and unformed stools, if the recent diet is more irregular, or long-term mental stress, patients with irritable bowel syndrome may appear long-term diarrhea and unformed stools; 3, intestinal tumors: if the patient suffers from colorectal cancer, colonic adenoma, small intestine malignant tumors, and so on. 3, intestinal tumor: If patients suffer from colon cancer, colon adenoma, small intestine malignant lymphoma and other intestinal tumors, in addition to long-term diarrhea and unformed stool, they may also have fever, blood in stool and other symptoms.