How effective is radiotherapy for multiple myeloma?

Multiple myeloma affects plasma cells and can weaken bones. A carefully aimed radiation field may be used for a painful bone lesion, a mass pressing on nerves or the spinal cord, or another local problem. It can reduce tumour activity in that area and help symptoms, but medicines are generally needed to address myeloma in other parts of the body.

The team balances the target against nearby organs and the strength of the affected bone. Relief may build over days or longer, and pain can briefly change during treatment. Follow-up may include pain and movement review, blood tests, and imaging chosen for your condition. Radiotherapy does not by itself repair a weakened bone, so fracture risk may need separate assessment.

Tell your team where pain travels, whether you have numbness or weakness, and which movements are difficult. Ask whether the bone needs support, activity limits, or input from orthopaedics or physiotherapy. Take pain medicines as directed, protect the treated area from strain, and report new symptoms rather than increasing activity because pain improves.

Seek urgent medical help for new leg weakness, numbness, loss of bladder or bowel control, severe back pain, or inability to bear weight. These can indicate pressure on the spinal cord or a fracture. Contact your oncology team for pain that is worsening, fever, confusion, or reduced urine, as myeloma and its treatment can affect more than the radiated site.

Ask what local problem radiation is addressing, when pain relief may begin, whether the bone is at risk of fracture, how radiation fits with myeloma medicines, and which symptoms need emergency assessment.