Between 3 percent and 20 percent of Americans experience irritable bowel syndrome (IBS) symptoms. The condition affects more women than men. Some people with IBS have minor symptoms. However, for others the symptoms are significant and disrupt daily life.Irritable bowel syndrome (IBS) is a common disorder that affects the large intestine. Signs and symptoms include cramping, abdominal pain, bloating, gas, and diarrhea or constipation, or both. IBS is a chronic condition that you'll need to manage long term.Only a small number of people with IBS have severe signs and symptoms. Some people can control their symptoms by managing diet, lifestyle and stress. More-severe symptoms can be treated with medication and counseling.IBS doesn't cause changes in bowel tissue or increase your risk of colorectal cancer.