Yep, mine hurts too. Don't know what it is but no matter how much grain-fed, hormone laced, low quality, ground and COOKED meat I eat, I don't get any symptoms other than if it's beef then I feel alive and well. But if I consume even an ounce of best quality, fresh, grass-fed, organic beef, I get nothing but a stomachache. It pretty much sits in me undigested along with the raw fat. Go figure...