Constipation

IBS can cause both diarrhea and constipation. Because the main bowel habit might alter with time, as a result, even if constipation is your main symptom, you might sometimes experience diarrhea. Constipation-predominant IBS is the most common type, affecting nearly 50% of people with IBS.

Stool transit times may be accelerated or slowed down by altered communication between the brain and bowel. As transit time increases, the gut takes in more water from the stool, making it harder to pass. Less than three bowel movements each week is considered constipation. “Functional” constipation describes chronic constipation not explained by another disease. It is very common and has nothing related to IBS. Functional constipation is distinct from IBS in that it typically doesn't hurt. Conversely, IBS constipation also includes abdominal pain that resolves with bowel movements.