Many studies have shown women with high bone density have an increased risk of breast cancer [70-75].
A meta-analysis that combined the results of 10 studies found women with high bone density had about a 60-80 percent higher risk of breast cancer compared to women with low bone density .
Having strong bones does not increase breast cancer risk.
Rather, high bone density is a marker for estrogen levels in the body (the more estrogen a woman produces in her lifetime, the more bone mass she has). These higher estrogen levels are linked to an increased breast cancer risk .
Learn more about estrogen and breast cancer risk.
Although women with higher bone density may have a higher risk of breast cancer compared to other women, they have a lower risk of osteoporosis .