what causes blocked bowels
Tumors, scar tissue (adhesions), or twisting or narrowing of the intestines can cause a bowel obstruction. These are called mechanical obstructions. In the small intestine, scar tissue is most often the cause.ymptoms include: 1  Cramping and belly pain that comes and goes. 2  The pain can occur around or below the belly button. 3  Vomiting. 4  Bloating and a large, hard belly. 5  Constipation and a lack of gas, if the intestine is completely blocked. 6  Diarrhea, if the intestine is partly blocked.