Stool rotting means that the stool is not shaped. Common causes include acute gastroenteritis, pancreatitis and irritable bowel syndrome. 1. Acute gastroenteritis: mostly caused by unclean diet, bacterial or viral infection of the intestinal tract leading to acute gastroenteritis, mainly manifested as abdominal pain, diarrhea, with the increase in the number of diarrhea, the change in stool properties, the appearance of unshaped stools. 2. Pancreatitis: Pancreatitis patients due to insufficient secretion of lipase, resulting in a large amount of fat can not be digested and absorbed into the stool, which can be manifested as unshaped stool. 3. Irritable Bowel Syndrome (IBS): mostly related to psychiatric factors such as depression and anxiety, and mostly diarrhea type, mainly manifested as abdominal pain, relieved after the stool, with the increase of the number of bowel movements, the shape of the stool gradually changed from lumpy to dilute watery stools, and therefore there will be a manifestation of the stools are not shaped. There are many other reasons for unformed stools, so it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or therapy.