People with IBS-C actually have two conditions. They suffer from both constipation and diarrhea. Well-not at the same time. They swing back and forth often in the same day.
Irritable Bowel Syndrome with Constipation is quite common. The most common is the version featuring diarrhea. The bowel’s response to inflammation is to draw a lot of water into the colon to dilute the stomach acid and to push everything out to try to limit the damage to the tissue.