Irritable bowel syndrome, or IBS, is a colon disorder that typically manifests in symptoms such as abdominal pain, cramping, constipation, diarrhea and gas, according to Mayo Clinic. It may also cause serious symptoms, such as weight loss and rectal bleeding.
Although the exact cause of IRS is unclear, factors that contribute to the occurrence of IRS include gastrointestinal nervous system disorders and abnormal intestinal contractions, which may be excessively strong or excessively weak, notes Mayo Clinic. Because the cause of IRS is unknown, its treatment involves addressing the symptoms to ensure a healthy lifestyle. Treatment options that alleviate IRS symptoms include change of diet and use of medications such as lubiprostone and alosetron.