What Causes Belching?

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Belching usually occurs after one has taken meals. Every time we swallow food, we take in some air with it. The stomach has a kind of valve that lets in whatever we eat and then quickly shuts up. This helps in keeping the stomach juices inside and not throwing up in the mouth. When too much air and gas collects in the stomach, the brain sends a message to it. The muscles of the stomach tighten up opening the valve. The noise is produced by the escaping air vibrating in the food pipe. This is known as belching.

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