Gas is caused by swallowing air and the breakdown of food in your digestive tract. The consequences are usually burping, feeling bloated, or passing gas. On average, most people pass gas at least 14 times per day. Some people have more gas than others, which may be uncomfortable or embarrassing.
The primary symptoms of IBS are abdominal pain or discomfort in association with frequent diarrhea or constipation and a change in bowel habits. There may also be urgency for bowel movements, a feeling of incomplete evacuation (tenesmus), bloating, or abdominal distension.
While there are several things known to trigger IBS symptoms, experts don't know what causes the condition. Studies suggest that the colon gets hypersensitive, overreacting to mild stimulation. Instead of slow, rhythmic muscle movements, the bowel muscles spasm. That can cause diarrhea or constipation.