Diagnosing Irritable Bowel Syndrome (IBS) is done by a medical doctor based on the symptoms you experience. The more common IBS symptoms are cramping, bloating, diarrhea and constipation. The normal causes of IBS are eating a bad diet, taking prolonged antibiotics, food poisoning or an operation in the pelvic area. The doctor will perform an examination of the stomach area checking for tenderness in the large intestine area.  Next, the doctor will refer you to a Maryland gastroenterologist for further examination. The gastroenterologist performs a rectal examination in which a tube with a light is inserted inside the rectum. This allows the doctor to see the bowel wall lining as…