I admit it, I often had gas in my body, feeling bloated and it's really uncomfortable. It's quite embarrassing as well when you're in public if suddenly farting and burping happen. Sometimes it does give some body and muscle pain on my body, which irritate me most of the time. So, I did some research.
Apparently, gas usually caused by swallowed by air or the breakdown of food through digestion. Some Food and Beverage might cause the body to produce more gas as well.