Hi Passing gas or burps are common post colon surgery The first thing suggested are to try to avoid foods that are known to produce more gas in the intestines (beans, cruciferous vegetables, citrus, nuts, mushrooms) Other, sometimes overlooked culprits are carbonated beverages, chewing gum, rapid eating, and medications or foods containing sugar alcohols (sorbitol, xylitol, mannitol). Also, many people lose their ability to digest lactose, both as they age and after bowel surgery, so avoiding dairy foods containing lactose may help this problem the foul smell and gas will decrease in few days Staying hydrated is important following surgery. Stick to fruit and vegetable juices without pulp, water, and Gatorade. Avoid caffeinated beverages, prune juice, and other drinks with dietary fiber Wish You Good Health Regards Dr Sridhar K