Slight pain in the abdomen and thin stools are commonly caused by the following reasons: constipation, intestinal stenosis and so on. 1. Constipation: After constipation occurs, the water in the stool will be absorbed by the intestines, and the stool will be very dry and thin, often accompanied by abdominal distension, and even a slight pain in the abdomen. 2. Bowel stenosis: If anal stenosis, rectal cancer, colorectal polyps and other diseases occur, it will lead to the narrowing of the bowel lumen, the stool will become thin, and due to the obstruction of defecation, it may lead to abdominal pain. It is recommended that patients go to the hospital, you can improve the relevant tests, such as routine stool, colonoscopy, etc., usually can be a clear diagnosis, and then you can carry out the appropriate treatment, do not blindly take drugs.