You may experience sharp pain triggered due to the build-up of abdominal gas. The pain is usually short-lived and will subside within a few hours. However, abdominal pain is also a sign of appendicitis. The pain will be mild and occasional initially and intensifies over the next few days, making it unbearable. Pain for flatulence is localized in the middle of the tummy. In the case of appendicitis, it moves towards the lower right side of the abdomen.