IBS can be divided into four subcategories:
• IBS-D. Primarily diarrhea (more than 25% of stools are loose) and abdominal discomfort
• IBS-C. Primarily constipation (more than 25% of stools are constipated) and abdominal discomfort
• IBS-mixed. Alternating between loose stools and diarrhea (more than 25% of stools are loose and more than 25% of stools are constipated) with abdominal discomfort
• IBS-U. Undefined and stools are varied (no stool consistency hits the minimum threshold of 25% of all stools)