A puffing up of the abdomen, usually caused by excess gas that has accumulated in the small and/or large intestines. Lactose intolerance, IBS, and other intestinal disorders may increase one's likelihood of experiencing bloating. Gassy foods such as beans, peanuts, cabbage, cauliflower, broccoli, kale and related foods may lead to bloating from fermentation of a certain carbohydrate that is high in these foods. Also, improper digestion of other nutrients (fats, carbohydrates, proteins) may cause bloating.