Irritable Bowel Syndrome May Be the No. 1 Health Problem No One Talks About

— -- Irritable bowel syndrome affects between 25 and 45 million people in the U.S., according to the International Foundation for Functional Gastrointestinal Disorders. Symptoms of IBS include gas, abdominal pain, diarrhea and constipation.

It's such a sensitive issue, some doctors say it's the No. 1 health problem people don't want to talk about.

Besser held an ABC News health tweet chat with doctors and patients from all over the country earlier today to talk about IBS. In case you missed it, here are the best tweets.