It is normal to have some intestinal gas. But too much gas is definitely a reason for worry. Excessive gas causes distention of abdomen, pain in abdomen, excessive burping, pressure on chest and heart, elevation of blood pressure, headaches, pain in back and many other health issues. When the gas moves from the intestine to the blood, and get excreted through the lungs and pores of the skin it causes bad breath and malodorous sweat or body odour.