Many studies have shown that women with high bone density have a higher risk of breast cancer than women with low bone density [47-52]. A meta-analysis that combined the results of 10 studies found that women with high bone density had about a 60 to 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 higher levels of estrogen 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 appear to have a higher risk of breast cancer, they have a lower risk of osteoporosis .