The underlying cause of bone tumors is not known, but in general, tumors occur when cells in a part of the body grow rapidly and out of control. Factors such as genetics, radiation therapy and bone damage play a role in the development of bone tumors.
Most bone tumors are benign in the sense that they are not cancerous and do not spread. But they still cause bone loss, fractures and other problems.
Malignant types of bone tumors (bone cancer) destroy normal bone tissue and may spread to other parts of the body.