Bone metastases: common patterns and care

Cancer cells in bone can disturb the normal balance between bone removal and rebuilding. The affected area may become painful or structurally weak, and a weakened bone can fracture with ordinary activity. Metastases in the spine can press on nerves or the spinal cord. Increased bone breakdown can also release calcium into the blood, causing thirst, constipation, drowsiness, or confusion.

Breast, prostate, and lung cancers are among the cancers that may spread to bone. Bone metastasis retains the identity of the original cancer; for example, breast cancer in a rib remains breast cancer rather than becoming primary bone cancer. Scans and sometimes a biopsy help distinguish these possibilities.

Tell the cancer team where pain occurs, whether it is worse with movement or at night, and whether it limits walking or sleep. Imaging can assess a painful site and show whether a bone needs protection from fracture. Until it is assessed, avoid loading a suddenly painful limb or attempting strenuous exercise.

Care can combine treatment of the original cancer with pain medicines, palliative radiotherapy, or bone-strengthening therapy. Surgery may stabilize a bone that is fractured or at high risk of breaking. Rehabilitation and mobility aids can support safer movement, while blood tests can identify raised calcium or other treatment concerns.

Get emergency help for new leg weakness, numbness, trouble walking, loss of bladder or bowel control, or numbness around the buttocks or genitals, particularly with back pain. These may indicate spinal cord compression. Sudden severe bone pain, inability to bear weight, or a visibly changed limb may signal a fracture. Marked confusion, repeated vomiting, or profound drowsiness also needs urgent assessment.

Ask which bones are affected, whether any area is at risk of fracture, and what activities are safe now. Clarify the cause of each treatment, how pain medicines should be adjusted, whether a surgical or radiation opinion is needed, and which new neurological symptoms require emergency care.