Bone metastasis occurs when cancer cells break away from the original tumor and spread to the bones, where they begin to multiply.

Doctors aren't sure what causes some cancers to spread. And it's not clear why some cancers travel to the bones rather than to other common sites for metastasis, such as the liver.

April 10, 2015

You Are ... The Campaign for Mayo Clinic

Mayo Clinic is a not-for-profit organization. Make a difference today.