Sigmoid volvulus is rare in the U.S., accounting for 10% of intestinal obstruction cases, researchers note. Risk factors include older age and chronic constipation. It’s not a condition the average ...

The sigmoid colon — the part of the large intestine nearest to the rectum — tends to be more “free floating” than other parts of the colon, says Dr. Alyson Cunningham, a colorectal surgeon ...