I am having too much gas in lower left side of stomach in afternoon but if I have a bowel movement in afternoon then the gas doesn't occur but if have not a good bowel movement or no bowel movement in afternoon then there is too much gas and discomfort. Why this cause and what's the treatment. What is reason that after good BM in afternoon not cause gas but no BM in afternoon cause too much gas and discomfort in afternoon and evening. Full day it feels like there's something on lower left stomach. Please tell me which disease is this and why this happens and how it cures.