Nursing care
Radiation Therapy: the nurse's role, start to finish
Written and reviewed by Dana Whitfield, RN, MSN · 5 min read · Updated September 2026
Short answer
Radiation therapy nursing means protecting the treatment field, managing predictable side effects, and teaching patients what is normal versus what needs reporting. Skin markings that guide the beam must never be washed off, no lotions or powders go on the treatment field unless the radiation oncologist approves them, and fatigue is a near-universal effect of treatment rather than a sign something has gone wrong.
What the procedure achieves
External beam radiation therapy delivers ionising radiation to a targeted tissue volume to destroy cancer cells by damaging their DNA beyond the point of repair. Healthy cells sit in the field too, but they generally recover faster than malignant ones, which is the basis for fractionating treatment into many small daily doses over several weeks rather than one large dose.
The nurse's role is not to deliver the beam. Radiation therapists and the oncology team handle dosimetry and delivery. The nurse's job is everything around it: preparing the patient for what treatment involves, protecting the skin and the marked field between sessions, catching early complications, and managing the cumulative effects that build across a course of treatment rather than appearing after a single session.
Pre-procedure nursing responsibilities
Before the first treatment, the patient undergoes a simulation session where the treatment field is mapped and marked, either with semi-permanent ink or small tattoo dots. Explain to the patient in advance that these marks are not decorative and not optional cosmetics; they are the coordinates the entire course of treatment depends on.
Assess baseline skin integrity over the planned field, baseline nutritional status, and baseline energy level, since all three will be tracked against this starting point as treatment progresses. Address anxiety directly. Many patients find the size of the machine and the isolation of the treatment room more distressing than the treatment itself, and a clear walkthrough of what happens in the room reduces that fear more than reassurance alone.
Equipment and positioning
Positioning devices, immobilisation moulds, and sometimes custom body casts hold the patient in the exact posture used during simulation, because even a few millimetres of shift can move the beam off target and into healthy tissue. The nurse's responsibility is reinforcing why stillness matters and helping the patient tolerate the position, not adjusting the equipment itself.
The treatment field markings sit at the centre of every equipment check. They must never be washed off, scrubbed, or allowed to fade before the treating team has re-marked them, because they are the reference points therapists align to before every fraction. If a mark starts to fade, that goes to the radiation therapy team to re-mark, not to the patient with a pen at home.
Complications and early signs
Skin reactions over the treatment field progress in a predictable sequence: mild erythema and dryness in the early weeks, followed by increasing redness, itching, and eventually moist desquamation in some patients as cumulative dose builds. Nurses assess the field at each visit and grade the reaction so changes in care can be escalated before the skin breaks down further.
Radiation to the head and neck brings mucositis and altered taste; pelvic and abdominal fields bring diarrhoea and cystitis symptoms; chest fields carry a risk of radiation pneumonitis that can present weeks after treatment ends. Site-specific effects need to be anticipated by field location, not treated as a uniform side-effect profile that applies everywhere the same way.
Post-procedure care
Fatigue accumulates across the treatment course and is expected in nearly every patient receiving radiation therapy. This needs to be framed to the patient as a universal effect of treatment, not a sign that something is going wrong or that the cancer is worsening. Encourage pacing activity and rest rather than pushing through it or panicking about it.
Skin care over the field is gentle and specific: wash with lukewarm water and mild soap, pat rather than rub dry, and avoid sun exposure on the treated area. No lotions, creams, powders, or deodorants go on the field unless the radiation oncology team has specifically approved that product, since many contain metals or ingredients that alter how the skin absorbs the dose.
What to teach before discharge
Teach the patient to protect the skin markings between sessions: no scrubbing, no exfoliating soaps, no hot water directly on the field, and loose clothing over the area to reduce friction. If a mark fades before the course finishes, the instruction is to contact the treatment team for re-marking rather than attempting to touch it up.
Set expectations for the shape of side effects over time. Fatigue and skin changes build gradually and often peak toward the end of treatment or shortly after, rather than appearing immediately. Give clear criteria for when to call: fever, skin breakdown with drainage, shortness of breath, or pain that is not controlled by the plan already in place, so the patient knows the difference between an expected effect and one that needs attention.
The next step on this is the same as on everything else here: answer questions and read the rationales. Our med-surg practice questions are the closest set to what this page covers.
One question from the med-surg set
A client with chronic obstructive pulmonary disease has an oxygen saturation of 88% on 2 L/min via nasal cannula and is alert with no distress. What should the nurse do first?
Rationale
In COPD a saturation of 88–92% is the therapeutic target, not an emergency, and this client is alert with no distress. The first action is the independent nursing intervention that is least invasive and most likely to help: sit them up and reassess. Turning the oxygen up to 6 L/min risks blunting the hypoxic drive, and calling rapid response or drawing an ABG escalates ahead of an assessment you have not finished.
Answer: B
Common questions
Why can't patients wash off their radiation markings?
The markings are the exact reference points therapists use to align the machine to the treatment field at every session. Washing them off risks the beam missing its target or hitting healthy tissue, so patients are taught to protect them and report fading rather than reapplying anything themselves.
Is fatigue during radiation therapy a sign of a complication?
No, fatigue is one of the most consistent effects of radiation therapy and builds cumulatively across the treatment course in nearly every patient. It should be managed with pacing and rest, and only investigated further if it is severe, sudden, or accompanied by other new symptoms.
What lotions are safe on a radiation field?
None without approval from the radiation oncology team first. Many common lotions, powders, and deodorants contain metallic or occlusive ingredients that can change how the skin absorbs radiation dose, so only products the treating team has specifically cleared should touch the field.
When does skin breakdown from radiation typically appear?
Mild erythema and dryness usually appear within the first couple of weeks of a fractionated course, with more significant reactions and possible moist desquamation developing later as cumulative dose increases. The pattern depends on total dose, fractionation schedule, and the specific body site being treated.
What symptoms after radiation therapy need urgent reporting?
Fever, skin breakdown with drainage or increasing pain over the field, new shortness of breath, or any symptom outside what the treatment team described as expected all warrant a call rather than watching and waiting. Site-specific effects such as respiratory symptoms after chest radiation deserve particular attention since some, like pneumonitis, can appear weeks after treatment ends.
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