Dear friend, welcome and thanks for entrusting your query here at HCM!
I am Dr. Prasad Akole (Critical Care Expert- http://bit.ly/Dr-Prasad-Akole) and am glad to address to your query here.
Since you say it is different than heartburn
of reflux disease, the possibility is gall bladder inflammation
if on the right side.
Bowel, stomach, spleen can be other organs of origin of pain.
Sometimes early lower lung pathology can cause pain.
Could you describe all the symptoms in details? Like what brings it on, how long does it last? What is it like? Increasing in any position? Relation to food?
Did you have fever, nausea
Would be glad to advise more precisely after you tell us these details.
If the pain persists or worsens, please see your doctor soon. If it points to gall bladder etc. a sonography
I hope you are fully satisfied with the guidance I gave.
I would be glad to answer any further queries. Please ask for any clarifications before closing and rating this answer.
Thank you and Good luck!