Hi Joleystub, I had a lumpectomy, sentinel nodes removed, chemo and radiation. I've had some issues with my shoulder and tightness under my right arm and across my chest. I had an ultrasound and was diagnosed with inflamed muscles around the shoulder. I've had some fairly painful sessions with a physio, but it helped free up a lot of movement. I have exercises to do, but my range of movement still isn't 100% and I still feel some stiffness under my arm and across my chest, but not anywhere as painful and restricted as it was. I was a bit slack with my exercises recently, so I need to get back to those. I think the Letrozole and abemaciclib/versenzo also cause stiff muscles, particularly if I've been sitting for a while.