You’ve heard that colon cancer can cause ribbon stools, but IBS can also do this.

For this article I consulted with Michael Blume, MD, a gastroenterologist at MedStar Good Samaritan Hospital, Baltimore.

“Ribbon stools are not uncommonly seen with IBS, although excluding other causes, such as anatomic problems, inflammatory disease, etc., would be prudent,” says Dr. Blume.

The exclusion process should also include colon cancer, even if you’ve had irritable bowel syndrome for years. IBS does not protect against colon cancer.

How does IBS lead to poops that are shaped like ribbons?

Dr. Blume says, “This usually occurs because if there is spasm in the colon, it may give one the sensation that there may be some obstruction and cause a change in the caliber of the stool.

“When one’s colon goes into spasm, as often occurs in IBS, the muscles in your large intestine constrict.

“Remember that you have muscles in your intestines, also, although they are somewhat different than the ones in your arms and legs that you voluntarily control.”

The type of muscle in your GI tract is called smooth muscle, and the muscle that enables you to bench press a barbell or comb your hair is called skeletal.

Dr. Blume says that when the intestinal muscles constrict, “they cause the diameter of your large intestine to become narrow, and when this occurs, one’s stools may appear narrow.”

In practice for 20+ years, Dr. Blume treats over 65 conditions including abdominal pain, appetite loss, blood in stool, celiac disease, colon cancer, esophageal and liver disease, gas and IBS.
Lorra Garrick has been covering medical, fitness and cybersecurity topics for many years, having written thousands of articles for print magazines and websites, including as a ghostwriter. She’s also a former ACE-certified personal trainer.