cancer. >> pancreatic cancer. >> pancreatic cancer. these are really red flag. you want to make sure you really do all the studies, maybe get a cat scan to find out what's going on. you're right, unfortunately a lot of teenagers are using laxatives to lose weight. and that's quite dangerous. so that's a question in the history of physical we do. hyperthyroid, too much thyroid it increases your metabolism, you could lose a lot of weight, you could lose hair and start panicking, et cetera. and medications mark talked about. for example, diuretics, somebody has high blood pressure, go on diuretics, lose a lot of salt and water quickly. be careful. and crohn's and constipation, diarrh diarrhea, back and forth, et cetera. but as a surgeon we see a lot of lap bands.