The noise you hear in the stomach during digestion is related to the movement of food, liquid, digestive juice, and when there is air in the intestine. Abdominal sounds are made within the small and large intestine.
Abdominal sounds are normal, but frequent and loud sounds may indicate a condition in the digestive system. Some symptoms accompany bowel sounds that indicate that it is an underlying condition this includes: vomiting, fever, bloody stool, constipation, excess gas, sudden weight loss, and nausea, etc.
Sometimes you experience abdominal sounds even not during digestion. Some other causes of abdominal sounds include hunger, infection in the digestive system, a tumor, food allergies, laxative use, perforated ulcers, abdominal surgery. It is advisable that when you have unusual abdominal sound it is necessary to see your doctor.