Radiotherapy to the breast and/or under the arm can cause hardening of the tissue and may explain why you have noticed that your breast is shrinking even after all this time. If the breast becomes hard this is known as fibrosis and is caused by a build-up of scar tissue. If the fibrosis becomes severe, the breast can become noticeably smaller as well as firmer.
As you have noticed a change you may want to contact your breast care nurse, if you have one, your hospital team or your GP so that they can assess the area further.
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Breast Cancer Care Nurse
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I had adenoid cystic carcinoma of the left breast nearly seven years ago. I had a lumpectomy and six weeks of radiation. I have recently noticed that my left breast appears to be shrinking. Do I need to get this checked?