Low back pain with diarrhea can have the following diseases: 1. The most common diseases are digestive system diseases, common digestive system diseases accompanied by low back pain and diarrhea, and acute gastritis, accompanied by severe intestinal disease, acute peritonitis, cholecystitis, pancreatitis and appendicitis, etc. will have clinical manifestations of abdominal pain accompanied by diarrhea. In particular, acute gastroenteritis with severe infection will involve pain in the retroperitoneum, and at this time there will be conscious back pain.2. Urinary system infection, urinary system obstruction, such as kidney, ureteral stones or acute cystitis, will also have clinical manifestations of back pain accompanied by diarrhea.3. Some general system diseases, such as acute intestinal obstruction and acute peritonitis, will also have the above symptoms.4. Common diseases in women, such as pelvic inflammatory disease or ectopic pregnancy, will also have back pain accompanied by diarrhea.5. The clinical manifestation of lumbago with diarrhea can also be seen in common female diseases, such as pelvic inflammatory disease or ectopic pregnancy.