Breast Cancer Surgery—Remove one or both breasts? — Mayo Clinic

Why are surgeons advising me to remove my other breast?
Some women who have breast cancer may be at an increased risk for developing breast cancer in the unaffected breast. They may choose to undergo another surgery rather than increased surveillance with mammograms, magnetic resonance imaging, or thermography.
When breast cancer survivors undergo prophylactic mastectomy (removal of the unaffected breast tissue) and reconstruction after breast removal (sometimes with saline/water or silicone implants), sometimes the new breast may not be acceptable. Poor cosmetic results, including scarring and changes in how the breasts look and feel, may affect sexual enjoyment and self-image.
Surgical scarring may interfere with mobility, especially with arm movement. In fact, even putting an arm around their partner is painful because of lymphedema and decreased range of motion. Also, finding a comfortable sexual position may be challenging. Discuss the pros and cons about prophylactic surgery with your surgeon, your partner, your oncological team, and your sexual healthcare provider. Do not feel rushed when making a huge decision regarding a major surgical intervention.
Terms:
Thermography – Diagnostic technique using a thermograph to record the heat produced by different parts of the body; used to study blood flow and to detect tumors.
Prophylactic mastectomy – Removal of the unaffected breast tissue.