After i laugh hard or do sit ups an area in my stomach will knot up and cramp. i have to physically push it back into place. it cramps ?

Hernia: This is consistent with an abdominal wall hernia. These are common, but should be evaluated by a physician soon. If you are unable to "push it back into place" or have pain in the area, go to the emergency room immediately.

Lump: more than likely it is a hernia------have your physician evaluate this for you----he/she can then direct you to the right treatment