A normal rib break is usually but not always accompanied by bruising on the chest. The chest wall however has no changes in shape except for swelling or bruising. Pressing on the outside of the chest...
You should go to the doctors and get them x-rayed. It might mean that you broke a rib, or if not you might have damaged it. It is better safe then sorry. If you didn't do something to your actual rib...
If this happens all the time it could be anything from an ulcer to an irritated colon from drinking. If it's just happened it could be pure gas. People who have a poor diet or eat greasy fast foods...
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