What does it mean when you can see and feel a heartbeat in your stomach and when you touch it it hurts and feels like there's a lump there?

Heartburn: Heartburn and gastritis will irritate the lining of the stomach in the lower part of the esophagus and can often times present with tenderness in the upper abdominal region. The lump you are feeling there is probably your xiphoid bone that has recently come to your attention. This is a small bone right at the bottom of the breastplate.