The pain that I have is always on the right side and I've been having them since I was a child. It feels like my chest is tightening up and it's a sharp stabbing pain. It felt like I was having a heart attack. It mostly happens while I was riding horses, I think the bouncing or jarring from the horse sparked the pain. But it has also happened while I've been running. I usually double over and wait for it to pass. It doesn't happen as much as it used too though, which I'm glad of.