Sudden pain in both ribs and blood in stool may be caused by Crohn’s disease, intercostal neuritis, hemorrhoids, bowel cancer and other diseases. 1. Crohn’s disease, the cause of which is unknown, may be related to immune factors, genetic factors, infectious factors, symptoms, abdominal pain and diarrhea, bloody stools, weight loss, low-grade fever, malaise and so on. Sudden pain in both ribs and blood in the stool may be caused by Crohn’s disease. 2. Intercostal neuritis, hemorrhoids, bowel cancer, etc.: Intercostal neuritis may cause sudden pain in the ribs, but will not cause blood in the stool, if accompanied by hemorrhoids, bowel cancer and other diseases, there may be two symptoms at the same time. Sudden pain in both ribs and blood in the stool need to go to the hospital in time for examination in order to clarify the cause of the disease and actively treat the cause.