hi!;) have you heard of Irritable bowel syndrome this is a common disorder that affects the large intestine. Irritable bowel syndrome commonly causes cramping, abdominal pain, bloating, gas, diarrhea and constipation. it is a chronic condition that you will need to manage long term. the cause is not known, but a variety of factors play a role like stress, foods, hormones and other illness. The walls of the intestines are lined with layers of muscle that contract and relax in a coordinated rhythm as they move food from your stomach through your intestinal tract to your rectum. If you have irritable bowel syndrome, the contractions may be stronger and last longer than normal, causing gas, bloating and diarrhea. Or the opposite may occur, with weak intestinal contractions slowing food passage and leading to hard, dry stools.