Painful or Mild-Pain Constipation? A Clinically Useful Alternative to Classification as Irritable Bowel Syndrome with Constipation Versus Functional Constipation

Purpose Abdominal pain is not used to characterize constipated patients. This study aimed to compare clinical, psychological, and physiological features in patients with IBS-constipation (IBS-C) with those in patients with functional constipation (FC) according to the intensity of abdominal pain.