As we age, we become acquainted with the common risk factors for osteoporosis: a thin frame, a family history, growing older. We also may learn about less-common risk factors: insufficient vitamin D and calcium, a lack of weight-bearing exercise, and excessive alcohol use. But who ever tells the breast cancer survivor that those hormone drugs she’s taking to prevent a cancer recurrence are also damaging her bones? Bone loss from hormone therapy – and what you can do about it.

I’m a breast...