Patient stops passing flatus and motion, abdomen is distended. Endogenously produced intestinal gases make up 74 percent of flatus in normal subjects. In addition, anal stretching can increase the rate of flatus incontinence. Some humans produce flatus that contains methane. "Gas incontinence" could be defined as loss of voluntary control over the passage of flatus. When this loss includes flatus (gas) it is referred to as anal incontinence. Not all humans produce flatus that contains methane. Over 99% of the volume of flatus is composed of non-smelly gases. This article suggests focusing on other indicators (flatus, pain, nausea) instead. Once continence to flatus is lost, it is rarely restored. The composition of flatus varies dramatically among individuals. This is, however, considered a rare cause of increased flatus volume. Enough entertainers performed with their flatus that the term flatulist was coined. Flatus incontinence may be the first sign of FI. Normal flatus volume is 476 to 1491 mL per 24 hours.