Specific Differences Between Costcochondritis And Reflux Symptoms? I Have Sternum

Specific differences between Costcochondritis and reflux symptoms?
I have sternum ache/pain, worse when touched. Also soreness/ache under left pectoral. I can actually feel where it hurts. I've had heartburn before, that deeper "burning" sensation, and this doesn't feel like that. But I do have mild reflux issues in the throat. The ache/pain in sternum and left part of ribs is not constant, it will hurt for about 10 seconds, then go away. Come back, then go away.