it definitely sounds like it could be an abdominal hernia. this most commonly happens around the belly button or in a previous site of surgery. while most hernias are harmless some can be dangerous. it's best to get your doctor to check it out to make sure it's nothing that needs treatment right now.
lying down flat and lifting up my head my stomach bulges in the center from my chest to my navel and is very soft. my ab muscles are hard on either side but the center is bulging and soft. is this normal or is this some kind of hernia?