It could be many things. It could be from slouching or sitting in a way that is causing the diaphragm to be compressed. Do not try to over straighten, just think of relaxing the muscles and allowing yourself to fall into a natural position. It could be injury from working out and doing crunches or other movements. It could be a stomach ulcer.
Another option is to blanch green beans quickly. Blanch your green beans by boiling them for 3 or 4 minutes. This removes the skin of your green beans. You want your beans to be somewhat tender, yet have a little bit of crispness to them. Determine the crispness, by how long you boil them.
Step 2. Fill a large pot with water and bring it to a boil. Place ice and cold water in a large bowl and set it to the side. Add the green beans to the boiling water for three minutes. Quickly put the green beans in the ice water to cool, for 3 minutes, and then thoroughly drain. Step 3.