Backaches following single side mastectomy

I will say i had a single then 20 months an expander was replaced, and both were done. I found in hindsight that i "tightened up". Frozen shoulder and trigger finger were two painful joint issues. I went to the Occupational therapy who was the one who told me the initial exercises i was given after breast surgery, were to be added to and kept up into the future.
One month out, I would contact my care team!!! Do you have a portal at the hospital? Your body is healing. Asking for help to relieve the lower back pain is good. For me it came down to stretching and exercise.