My 12 year old is a cancer patient who is having a difficult time the digestive system. After the episode he had in a hospital where, I think, contrast dye form CT scan has caused further weakened already weakened digestive system. The kid got weaker after the last CT scan, because he is unable to eat. He eats smaller and smaller potion.Now, when he sleeps, we can see the violent movement of the Stomach and Intestine. What is the cause of the rumbling of the Stomach and intestine?