Chest pain when moving going toward the left side of my chest and towards my left shoulder. I also have fairly bad heartburn from time to time. Why?

Probable esophageal . The problem of heartburn and chest pain are closely related. Heartburn, a symptom of gastro-esophageal reflux (gerd), can occasionally result in spasm of the lower part of the esophagus. This is perceived in your brain as left sided chest, shoulder, and arm pain. It is a great mimic to cardiac pain. The underlying problem is likely gerd as consequence of abnormalities such as a hiatal hernia.