What Causes Radiating Pain In Right Chest And Shoulder Blade After Exercise?

Hi I think I pulled my pectoral is muscle at the gym the other day. I had been bench pressing then did some butterfly sit ups and when I pulled my arms above my head I felt a cramping under my arm pit. Now I have pain that radiates to a particular spot on the top of my right chest and the back of my right shoulder blade and it makes my right arm feel kind of numb. It hurts to bend, twist, sneeze, cough, and breathe deeply and I feel it mostly in my back around the bottom medial side of my right shoulder blade toward the spine. Is this all from a pulled pectoral is muscle or did I do something else as well? The only thing that hurt was right under my arm going down toward my chest a few inches. A few days later my shoulder, top of my chest, and arm started to bother me.