[Marina Kits]

I've been on NBE a little longer than you - slightly different routine but I've never had pain in my chest that made me want to take pain relievers. As long as the pain is where you want the gain, I wouldn't worry about it - it's a pretty common result of what you're doing. Maybe drop the PM a notch and see if the pain lessens. There's no evidence that more pain = more growth or for that matter, absence of pain = absence of growth.