Lately I been experiencing a burning pain in what feels like my right lung back side, however, it dosent hurt when I breath. My first thought was mussel pain but there is no sensitivity to the touch and very little relief when stretching. There is a slight relief when I belch which seems to be more frequent the last couple of months, but the relief dosent last. Sometimes I can feel a slight discomfort in the area below my right arm pit behind the rib cage. I tried tums and pepto but to no avail. What can this be?