My boyfriend has been complaining that he has pain in the middle right side of his back. (He s not one to complain about pain ever) I was going to rub his back and I feel a big lump where he says his pain is coming from. It s more like a hard knot but it feels really big in size to me. He doesn t seem real concerned but I am. I m not sure if any of the following will be of help or not...... He s 57 yrs old, overweight, 220 lbs and had quadruple bypass surgery last year, after having his life saved a couple years ago when he had a cardiac arrest. All his follow up appts. have been just fine as far as his surgery goes.