I got upper back pain after lifting at work. Why does it hurt when food passes that area?

Indigestion in the stomach (acid reflux) is felt between the bottom of the shoulder blades, so this may be an explanation.

If you experience a feeling of excessive fullness after eating or that food sits heavily, please consider a bitter remedy called Centaurium. It is bitter to taste of course but when held in the mouth for 30 seconds or so 10 minutes before meals, it certainly helps normalise stomach function.

Best wishes

Earle