Radiotherapy for lung cancer symptoms | Cancer Research UK
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Radiotherapy for lung cancer symptoms

Nurse and patients talking about cancer

This page is about radiotherapy for symptoms of cancer that has spread to the lungs. There is information about


Why radiotherapy is used

Cancer that has spread to the lungs can cause symptoms such as

  • Chest pain
  • A cough
  • Breathlessness
  • Coughing up blood

The treatment helps to shrink the cancer and reduce the symptoms. It might help to keep your cancer under control for longer and make you comfortable, but it can't cure the cancer.

Radiotherapy can work very well for tumours in the lungs. It works whether they are from a cancer that started in the lungs or one that has spread there from somewhere else in the body.


How you have radiotherapy for lung symptoms

You are most likely to have external beam radiotherapy. 

External beam radiotherapy

You will probably have a course of treatment sessions called fractions. You have treatment once a day, from Monday to Friday. The exact length of the course depends on your particular situation but is generally about 2 weeks.

First, you have a specialised CT planning scan so the treatment team can plan exactly where to give the radiotherapy. You might also need to have a plastic mould made to keep you still during the treatment sessions.

To have the treatment you lie on a radiotherapy couch. The radiographers help you to get into the right position.

A photo of a linear accelerator, which gives radiotherapy

The staff then leave the room. This is so they are not exposed to the radiation. You will be alone for a few minutes. The radiographers watch you carefully on a closed circuit television screen.

You can't feel the radiotherapy. It doesn’t hurt but you might find it uncomfortable to lie in position during the treatment. The radiotherapy couch can be quite hard. You can ask your doctor or specialist nurse if you can take a painkiller half an hour beforehand if you think it might help.

Internal radiotherapy (brachytherapy)

Some people have treatment with internal radiotherapy from inside the airway. You might need this if your tumour is blocking or partly blocking the airway. Giving radiotherapy treatment in this way is called brachytherapy or endobronchial therapy. Your doctor puts a tube called a bronchoscope into your airway, either through your mouth or nose.


You have a local anaesthetic sprayed into your throat beforehand. The doctor puts a thin tube called a catheter inside the bronchoscope and into your lung. You have a CT scan to make sure the tube has gone to the right area.

The radiographers then connect the catheter to the brachytherapy machine. They leave the room and watch you from outside on a closed circuit television screen. The brachytherapy machine contains a small radioactive metal ball that leaves the machine and travels into the tube. Once it has reached the tumour it releases radiation for a few minutes.

During the treatment you feel nothing and it is painless. When the treatment ends the radioactive metal goes back into the machine. The radiographers come back into the room and remove the tube. You usually have this type of radiotherapy in 1 or 2 sessions.


Results of the treatment

Radiotherapy usually works very well and quickly for lung cancer symptoms. Your symptoms should start to improve within a couple of weeks of starting the treatment.


Side effects

The side effects are usually mild. They tend to come on as you go through your treatment course and may last for a week or two after the treatment has finished.

  • You may feel more tired than before the treatment started
  • Your skin may go red in the treatment area if you have external radiotherapy
  • You might feel sick, because the lungs are quite close to the stomach – you can have anti sickness medicines (anti emetics) and it may help to take them 20 minutes before your treatment

More information about radiotherapy

Find out about

External radiotherapy

Internal radiotherapy

Side effects of radiotherapy to the chest

Radiotherapy moulds and masks

Anti sickness medicine

For general information and support 

Contact the Cancer Research UK nurses on freephone 0808 800 4040 (Open 9am to 5pm, Monday to Friday)

Share experiences on our online forum – Cancer Chat

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Updated: 14 March 2016