Ever since I've had IBS my gut has made all kinds of weird and rather loud noises. To me it usually sounds like a gurgling liquid, but sometimes it sounds like gas whooshing through. It has been so loud that other people can hear it from across the room sometimes. A couple times I've had to walk out of a theater since it's been so embarrassing. Every doctor I've told about it seems to dismiss it completely. I don't know exactly what causes it. I think maybe it's something we all have but in IBS it's just much more amplified since our guts are more active or something.