I have a feeling youre asking this because of rotator cuff pain. Its likely rotator cuff tendonitis. If your having pain in your rotator cuff, don't play around with this! You can't work your chest without working your rotator cuff. If you mess your rotator cuff up its bad bad. If I'm right, take some time off from upper body until it feels normal and then give it another week. Tendons take A LONG TIME to strengthen/build up/repair, compared to muscles. Train everything else outside of arms chest back delts tris and bis in the meantime.