Welcome to Just Answer and thanks for your question. Osseous metastatic disease is cancer that has spread (metastasized) from some other site to the bone(s).
It often comes from breast, lung, or prostate cancer that has metastasized. You can read more about it in the link below.
Symptoms depend on where in the bone the cancer has spread to and what changes it is causing. In the spine it can cause the vertebra to crumble and place pressure on the spinal cord leading to pain and paralysis. It can cause headaches if it is in the skull, broken bones if it is in an arm or leg as the bone deteriorates. The most frequent symptom though is pain.