A little pain in the tummy from the force of the stool is associated with constipation, rectal polyps, rectal tumors and other diseases. When constipation occurs, the stool is too dry because it stays in the intestine for a long time. During defecation, excessive force is needed to help the feces pass, and during the process of defecation, dry feces also causes irritation to the intestinal wall, resulting in pain in the small stomach. Some people have polyps in the rectum, which can cause irritation to the muscles when straining to defecate. In this case, not only bleeding will occur, but also pain in the rectal area, which is mainly in the small stomach because the rectum is located in the small stomach area. Rectal tumor is a malignant disease, which will not only cause relative narrowing of the rectum, but also affect the function of the rectum, and will cause damage to the tumor and induce pain in the tumor area when you force to defecate.