I have had the exact same chest pain described above for about 8 years now. It started early in Highschool when I started growing, and I still have it(I am now 24). My main concern is that I used to crack my chest once every few months, and now I seem to be doing it 5-10 times a day. I have tried to leave it alone, but the pressure just seems to build up and I feel I have to crack my chest to releive it.
I feel bad for those people who havn't figured out how to crack it yet, I know how much that sucks. Heres what I do: I take a deep breath and fill my upper chest with air, then arch my back(while standing) and try to push my shoulders as far back as possible, while sticking my chest out foreward as far as possible. Then I give a little down on my lower ribcage with my hands, and CRACK!
Hope it works. I'm also curious to see if thats what other people do, or if all of us "Chest Crackers" have our own styles. Let me know.
By the way, I think we should all say a little about ourselves so we can find a common denominator. I am also sort of tall and fit(someone above mentioned that), but not overly so. I also tend to slouch forward when sitting, especially while typing, and I think that makes it worse. I think the most important trait to mention is that I have a concave chest. You know... it kind of looks like a cereal bowl where the middle of my chest should be flat. I am not a smoker, never have, but I typed in "crack my chest" and found this blog.
Let's get to the bottom of this!
Kevin