I recently started on Humira and noticed about the same time I received my first injection, I had, what seems like a pinched nerve in my upper back close to my clavicle. I'm not sure if I worked in the yard or something at about the same time which could have caused this, but I do know that this feels like a pulled muscle or pinched nerve. Has anyone else experienced this? Would really like to know if this medicine is affecting some part of my body that it shouldn't be.