It really isn't anything like throwing up. It is more like a burping up but there is saliva that comes up too. It doesn't have stomach acid, there is no wretching, it just kind of comes up. I look for restrooms at restaurants just in case I will need it. When the food comes up the pain in your chest stops and it is over. You will know when it happens, but don't worry about it. Some people never experience it. I have had alot of problems with it, even with a loose band. Tracy