What are the symptoms of a bad intestine? The common symptoms of poor intestinal tract can be abdominal pain, diarrhea, bloating, constipation, depending on what intestinal pathology: 1. If it is an inflammatory disease of the intestine, it can be caused by pathogenic bacteria, such as viruses, bacteria, can be mainly diarrhea, in addition to diarrhea there is abdominal pain, can also be accompanied by mucus pus blood. 2. If the intestinal disease like colitis, mainly diarrhea and mucus pus blood stool. 3. It is an intestinal disease caused by Mycobacterium tuberculosis, which can alternate between diarrhea and constipation, and often when these symptoms appear, positive signs can be found through physical examination. 3. Tumors can also appear in the intestinal tract, and early stage of tumors, such as intestinal cancer and colorectal cancer, can have no symptoms in the early stage, and sometimes positive OB of stool can be found when doing routine stool.