hi, thank you for your query. Belching is generally caused by swallowing air when eating or drinking and subsequently expelling (or inhaling) it, so in this case the expelled gas is mainly a mixture of nitrogen and oxygen. Belching combined with other symptoms such as dyspepsia, nausea and heartburn may be a sign of an ulcer or hiatal hernia, and should be reviewed by a physician. Other causes of belching: food allergy, gallbladder problems, acid reflux disease, H. pylori, and gastritis. some home remedies include- -Avoid the foods that affect you most.If dairy products are a problem, try low-lactose or lactose-free varieties. -Eat fewer fatty foods. Fat slows digestion, giving food more time to ferment. Temporarily cut back on high-fiber foods. Fiber aids digestion, but many high-fiber foods are also great gas producers. -Eat slowly. Try to make meals relaxed occasions. Eating when you re stressed or on the run can interfere with digestion. -Get moving. It may help to take a short walk after eating. -Try an over-the-counter remedy. Products such as Lactaid or Dairy Ease can help digest lactose. thank you, wishing you good health