The stool appears yellow and yellow-green are normal colors, but if it is not formed, the following three causes should be considered: 1, acute and chronic gastrointestinal diseases: such as acute gastroenteritis, ulcerative colitis, intestinal tuberculosis, intestinal tumors, Crohn’s disease, etc. 2, extraintestinal factors: such as chronic hepatitis, cirrhosis, fatty liver, cholecystitis, pancreatitis, pancreatic tumors, diabetes, hyperthyroidism, etc., can cause rapid intestinal motility. 3, psychological and mental factors: such as gastrointestinal neurosis, mental stress, environmental changes, etc. can cause irritable bowel syndrome. When there is a change in the nature, color and bowel habits of the stool, it is important to pay attention to further relevant examinations, including colonoscopy, to clarify the cause and give comprehensive treatment to avoid delaying the disease.