Basically i woke today with my lower side hurting. Not my ribs. Just my lower side not my entire side just a part of it. It hurts like its bruised. Like i was punched but there's no actual visible bruise. I know my daughter jumps on me alot (shes 19 months old) but i dont know if it could've been her. Its been hurt all day. I can literally massage where the pain is and touch it like a bruise. What could cause this?