Hey everyone. I am 22 years old and I am an avid weightlifter and last week I pulled my upper back muscle. I waited 4 days and it felt almost 100% so I went right back into lifting. A few days later it seems like a different pain now. It hurts my left side/middle of my upper back to breathe in and earlier it felt like my chest was experiencing acid reflux or something because it was burning. For the last week my chest has been hurting on and off and it hurts to twist my upper torso, arch, and it hurts to press on the muscle in my back. Also for the last 3 months I feel a little sharp pain (minor) by my ribs when I swallow but that is on and off. Overall I think this may be a strain or pull.