The sigmoid colon is the last section of the bowel — the part that attaches to the rectum. It's about a foot and a half long (around 40 centimeters) and is shaped like the letter “s.” Its job is to hold feces until you're ready to go to the bathroom. The sigmoid contains a lot of muscle tissue.

What is the main function of sigmoid colon?

The sigmoid colon contracts to increase the pressure inside the colon, causing the stool to move into the rectum. The rectum holds the feces awaiting elimination by defecation.

What happens if the sigmoid colon is removed?

However, because part of your colon was removed, you may experience loose stools for several days or even months. This is normal and will resolve after the remaining colon does the job of absorbing water. Being up and about after surgery is also helpful in regulating bowel function.