When i over eat my chest hurts why?

Heartburn: This is likely heartburn that you are experiencing. Overeating over time will stretch the gate (sphincter) between the esophagus and stomach that keeps food down and lead to reflux (heartburn). Try eating small frequent meals throughout the day. Good health.

Non cardiac pain : You are probably experiencing indigestion and excessive acid production . You may also have a hiatal hernia where part of your stomach slides into your chest thru a defect in the diaphragm . A rare situation is AchalAsia with tightness at the bottom part of your esophagus and the food does not go down into the stomach , esophagus street hes , genes the pain . Need upper GI studies to diagnose .