People under a lot of stress often swallow large amounts of air. Some people swallow air frequently because they have post-nasal drip, chew gum, or smoke. Rapid eating or poorly fitting dentures also may cause too much air to be swallowed. Also, drinking beverages that contain carbonated water may increase gas in the digestive tract. These drinks contain carbon dioxide, which can produce large amounts of gas when warmed in the stomach.
Some people experience frequent belching.
This might occur after a person has swallowed air without realizing it. To clear material from the esophagus, a person may swallow frequently, which leads to more intake of air and further belching. There are many causes of acute or chronic gastritis, but the most common cause is infection with a bacterium called Helicobacter pylori . When this organism gets into the stomach, it can produce bloating. The doctor may detect the infection with a breath test or a blood test.