My mom used to have breast cancer few years ago she had surgery, chemo, radio, and now hormonal. she is now feeling itchy inside her arm and swelling?

CA vs lymphedema: Likely lymphedema. Could be breast cancer recurrence. See oncologist for imaging and physical examination. If lymphedema see a lymphedema specialist.

Could be lymphedema: Is this the arm on the side of the surgery and radiation? Were the lymph nodes removed? Swelling of the arm (lymphedema) can occur years after treatment and can be managed with physical therapy and a sleeve. However, a recurrence of the cancer in the axilla (under the arm) should be ruled out in any patient who develops lymphedema years after treatment.