Why would my stomach hurt when i lay on it?

Pain is a language: If you do something that hurts - whether it's laying on your stomach, twisting backwards or jumping off a high step -- your body 'speaks' to you in a language of pain. Usually it gets your attention and you STOP doing what causes it! Your stomach can't tell you 'why' your positioning is not a good thing - but you could be putting 2 much pressure on a vital organ. The abdomen has a lot inside it.