Flatulence is the passing of gas from the digestive tract out of the anus. It is a normal bodily function that can be caused by certain foods, beverages, or medications. Symptoms can range from mild to severe and can be accompanied by abdominal pain, bloating, and discomfort. Symptoms can develop gradually or rapidly, and can range from mild to severe. Manifestations of flatulence can include belching, abdominal rumbling, and passing of gas.