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Radiotherapy for brain cancer symptoms

Radiotherapy can help relieve symptoms caused by cancer that has spread to the brain.These symptoms can include headaches and sickness. Find out about how you have treatment. 

How radiotherapy can help

When cancer has spread to the brain from elsewhere in the body, it is called a secondary brain tumour or a brain metastasis.

Cancer growing inside the brain increases pressure inside the skull. This can cause symptoms such as:

  • a bad headache
  • sickness
  • increasing drowsiness

Radiotherapy is a common treatment for secondary brain tumours. It aims to shrink the cancer, relieve the pressure inside your skull, and reduce your symptoms. 

Your doctor might suggest that you have radiotherapy to the whole of your brain. This is because it's likely that there might be cancer elsewhere in the brain that is too small to show up on a scan. 

How you have treatment

You have radiotherapy to the brain as a course of daily treatment sessions called fractions. It is likely to be 1 to 2 weeks of daily treatments. But this can vary. 

You have a specialised CT planning scan so the treatment team can plan exactly where to give the radiotherapy. 

To have the treatment you lie on a radiotherapy couch. The radiographers (sometimes called radiotherapists) help you to get into the right position. It is very important that you keep perfectly still. You have a plastic mould or mask to wear to help with this.

While you are lying down, the plastic mould will be put over your face and head and onto the radiotherapy couch. It makes sure that you don’t move in the middle of your treatment.

Photograph of a stereotactic radiotherapy mask for treating brain, head and neck cancers
A plastic mould

Your radiographers then leave the room. This is so they are not exposed to the radiation. You will be alone for a few minutes, but they can see and hear you the whole time.

You won't feel anything during the radiotherapy. But the radiotherapy couch is usually quite hard, which can be uncomfortable.

Some people with secondary brain cancers have stereotactic radiotherapy. This gives radiotherapy from many different positions around the body, with the radiation beams meeting at the tumour.

Treatment results

Radiotherapy treatment to control symptoms of brain cancer might take a few days or weeks to work. The radiotherapy might cause swelling at first, which might make your symptoms seem as though they are getting worse.

Your doctor will usually prescribe steroids during your radiotherapy to help with the swelling. 

The radiotherapy might also help to stop new areas of cancer developing in the brain. So although you won't notice it, the treatment may be stopping the situation from getting worse. 

Side effects of brain radiotherapy

Side effects include: 

  • hair loss in the treatment area - it usually will grow back
  • sickness - but you will take anti sickness medicine during treatment to help
  • drowsiness
  • fits (seizures)
  • headaches

You can talk to your doctor or radiographers about any side effects you are experiencing and they can help you to manage them. 

Last reviewed: 
23 Jan 2019
  • External Beam Therapy (2nd edition) 
    Peter Hoskin
    Oxford University Press, 2012

  • Devita, Hellman and Rosenberg's Cancer Principles and Practice of Oncology (10th edition)
    VT Devita, TS Lawrence and SA Rosenberg
    Wolters Kluwer Health, 2015

  • Radiotherapy in practice - Brachytherapy (2nd edition)
    P Hoskin, C Coyle
    Oxford University Press, 2011

  • Practical Radiotherapy Planning
    A Barrett and others, 
    Hodder Arnold, 2009

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