Hi,
About a month or two ago, I believe I had strained some muscles while working out. The pain didn't happen right away maybe one or two weeks afterwards. At first it stemmed from my neck, shoulders, and upper back. Soon after I started to feel pain in my chest, both sides right by my armpits, lower back, and abdomen area especially on my right side. The pain is usually sharp. When I do sit for a long period of time, both my right and left sides hurt but more on my right.