Bowel sounds are noises produced by the movement of gas and fluid in the intestines. These sounds occur as the digestive system processes food and can vary in frequency and intensity. They are typically classified as normal, increased, or decreased, depending on the activity level of the intestines. Healthcare professionals often listen for bowel sounds using a stethoscope during a physical examination. The presence or absence of these sounds can provide important information about the health of the digestive system and may indicate conditions such as ileus or bowel obstruction.