Stomach gas is a very uncomfortable problem in which there is bloating. The stomach gets swollen. The main cause of gas formation is swallowing air while eating or drinking some foods and drinks. Digestion problems and intolerance also causes gas. We will tell you about some foods that cause gas. Vegetables like onion, cabbage and asparagus produce gas due to the sugar present in them. Fruits that produce gas are prunes and apples. Starchy foods like corn, potato, wheat bread and pasta causes gas. You should avoid these foods. You should also avoid dairy foods like milk and cheese. Following are the 8 surprising foods that cause gas.