A little late in the day but I myself was looking for an answer to this a few days back. So want to spread whatever little wisdom I have gained in the few days. In my case, it was nothing but simple indigestion. It got me worried a lot initially and whomever I'd ask, would tell me to get a proper checkup done.
I then researched up a bit and found out that it can be because of a variety of reasons, some of them not being harmful at all. But in some cases, if the pain persists, it might actually be pointing to something as serious as liver inflammation, bronchitis or infection in your gallbladder.
Checking out this should help you understand your condition. Chest Pain on Right Side
