Signs or symptoms of gas or gas pains include: 
Burping
Passing gas
Pain, cramps or a knotted feeling in your abdomen
A feeling of fullness or pressure in your abdomen (bloating)
An observable increase in the size of your abdomen (distention)
 Burping is normal, particularly during or right after a meal. Most people pass gas up to 20 times a day. Therefore, while having gas may be inconvenient or embarrassing, burping and passing gas are rarely by themselves a sign of a medical problem.