Gastroenterologists are medical specialists who treat bowel disorders and other diseases concerning the digestive tract, liver, pancreas and gallbladder, according to American Gastroenterological Association. A gastroenterologist completes years of medical school, an internal medicine residency and fellowship to be qualified to diagnose and treat gastrointestinal disorders.
Gastroenterologists generally require procedures such as abdominal X-ray and CT scan of the belly to diagnose obstructions in the small and large intestines. Causes of mechanical obstructions of the small intestine include tumors, scar tissue and narrowing of the intestines, states WebMD. Intussusception, which occurs when a portion of the intestine folds inward into itself like a telescope, also causes bowel obstruction. Common causes of large bowel obstruction are cancers of the colon, stomach, ovary, lung and breast, states the Cleveland Clinic.