What should you know about HDR radiotherapy?

HDR stands for high-dose-rate. Unlike external radiotherapy, which directs radiation from a machine outside the body, HDR uses an applicator to bring a radioactive source to a planned position. The source is removed after delivery. The applicator and treatment area depend on the cancer: examples include the cervix, womb, breast, skin, head and neck, bowel or brain. Imaging and careful positioning help the team shape treatment around nearby healthy tissue.

HDR may be used on its own, after surgery or alongside another form of radiotherapy. Expected effects depend on the treated body area and can include soreness, swelling, tiredness, skin change or irritation of a nearby organ.

Ask how the applicator will be placed, whether sedation or anaesthesia is needed, and whether you can eat, drink or take medicines beforehand. Wear comfortable clothing and arrange support for travel if medication may make you drowsy. Follow wound, skin or local-care instructions exactly. Keep a written list of symptoms and bring it to review, especially if the treated area is difficult to inspect yourself.

Contact your radiotherapy team promptly for severe pain, increasing swelling, fever, unusual bleeding, discharge, worsening skin breakdown or difficulty using a nearby organ. Emergency care is appropriate for sudden breathing difficulty, collapse, confusion or uncontrolled bleeding. The team can tell you which local reactions are expected for your treatment site and which require examination.

Where will the applicator be placed? How many visits are planned? Which organs are close to the treatment area? What care is needed between visits, and when should late effects be reported?