A plain-English guide to how external-beam radiotherapy works, how a course is planned in daily fractions, what it costs abroad, and how to keep care joined up with home.
Written by our medical board, reviewed quarterlyUpdated 21 January 197010 min read
What radiotherapy is and who it is for
Radiotherapy uses precisely targeted high-energy radiation to damage the DNA of cancer cells in a defined area so they cannot keep dividing. Unlike chemotherapy, it acts locally, so it is used where the cancer is concentrated in one region. It may be the main treatment (for example in some head-and-neck or prostate cancers), used before or after surgery, combined with chemotherapy, or given to relieve symptoms such as pain or bleeding in advanced disease.
The decision to use radiotherapy, and how to deliver it, is made by a radiation oncologist within a multidisciplinary team, based on tumour type, location and stage. Because a typical course runs daily over several weeks, many patients are best treated close to home. Patients do travel for radiotherapy when they need a technique or platform not available locally, or to access a high-volume centre — but the daily schedule makes continuity and logistics central to any plan.
If you are weighing treatment abroad, a reputable centre will want your imaging and pathology before planning anything, and will be explicit about the full course length, not just the cost of a single session.
Techniques and how they differ
Most external-beam radiotherapy today is delivered as IMRT (intensity-modulated radiotherapy) or VMAT, which shape the dose tightly around the tumour to spare surrounding healthy tissue, usually guided by daily imaging (IGRT) to ensure accuracy. Older 3D conformal techniques are still appropriate for some situations. Within this broader category, several specialised approaches deserve separate consideration: stereotactic radiosurgery and stereotactic body radiotherapy deliver very high, focused doses in a few sessions and are covered under CyberKnife and Gamma Knife, while brachytherapy places the radiation source inside the body and proton therapy uses charged particles for greater dose control.
The distinction that matters to patients is dose, precision and number of sessions. Conventional fractionated radiotherapy spreads the dose over many small daily treatments (fractions) to let healthy tissue recover between them. Stereotactic approaches concentrate the dose into far fewer, highly precise sessions for suitable, well-defined targets.
Which technique fits you is a clinical decision, not a shopping choice. Beware any centre that markets a single platform as universally superior; the best choice depends on the tumour's type, size, location and proximity to sensitive structures.
Planning, what is included and what it costs
A radiotherapy course involves more than the beam time. It begins with a planning phase: a CT planning scan (sometimes with MRI or PET fusion), careful contouring of the target and nearby organs, a physics dose plan and quality checks before the first treatment. A genuine quote should include this planning work, the number of fractions, image guidance, review appointments during the course, and follow-up.
As a broad orientation only, a full course of conventional external-beam radiotherapy at an accredited international centre commonly falls in the low-to-mid thousands of euros, with the total driven by the number of fractions and the technique. Highly specialised modalities cost considerably more and are covered on their own pages. Treat single-session pricing with caution, because radiotherapy is sold as a course, not per zap.
Clarify whether planning, imaging and any combined chemotherapy are included, and what happens if the plan needs adjusting partway through, which does occur. A responsible centre quotes the whole course.
Choosing a centre and a radiation oncologist
Radiotherapy safety depends heavily on equipment quality assurance and the team behind the machine — the radiation oncologist, medical physicists and radiation therapists. Look for hospital accreditation such as JCI and for evidence of a robust physics and QA programme; ask how often the linear accelerators are calibrated and how plans are independently checked. Confirm the radiation oncologist is board-certified.
Volume and modern image-guided equipment are good signs. Ask how often the centre treats your tumour type, which technique they propose and why, and how they verify daily positioning. A centre that can explain its dose plan in plain language, and the trade-offs it made to protect nearby organs, is reassuring.
As with all cancer care, judge the centre by its engagement with your home team. It should request your full records before planning and commit to sending a detailed treatment summary — total dose, fractionation, fields treated and any combined therapy — back to your home oncologist.
Side effects, recovery and timeline
Radiotherapy is generally well tolerated but causes side effects in the treated area that tend to build over the course and peak shortly after it ends. These are mostly local: skin redness or soreness, fatigue, and region-specific effects such as a sore throat, bowel or bladder irritation, depending on the site treated. Most acute effects settle over the weeks following treatment. Some late effects can appear months or years later, which is why long-term follow-up matters.
The practical planning fact is the daily schedule. A standard course runs once a day, on weekdays, for several weeks, so treatment abroad means staying for the duration or choosing a centre and technique with fewer fractions where clinically appropriate. Most patients continue normal activities during a course, though fatigue accumulates.
Whenever you travel for radiotherapy, leave with the precise treatment record — total dose, number of fractions, areas treated — because this information limits how much radiation any region can safely receive in future and is essential for your home team.
Risks and what if something goes wrong
Serious complications are uncommon with well-planned, well-delivered radiotherapy, but risks exist: damage to healthy tissue near the target, late effects on specific organs, and a small long-term risk of a second cancer in the treated field. These risks rise if planning, equipment QA or positioning are poor — which is precisely why a centre's physics and quality systems matter more than its price.
The travel-specific risk is discontinuity. A course delivered abroad must be documented so completely that your home team knows exactly what dose each part of your body has received, since this constrains any future treatment. Get a second opinion before committing, and confirm your home oncologist will receive the full radiotherapy record.
Ask in advance how the centre manages acute reactions during the course and any problems after you return home. Keep every document, especially the dose summary — it is one of the most important records a cancer patient can hold.
Frequently asked
Does radiotherapy make me radioactive?
No. External-beam radiotherapy passes through you and leaves nothing behind, so you are not radioactive and pose no risk to others. (Some internal techniques like brachytherapy differ and are managed with specific precautions.)
How long does a course of radiotherapy take?
A conventional course usually runs once daily on weekdays for several weeks. Some situations allow shorter, more intense schedules, and stereotactic techniques use just a few sessions, so the total length depends on the technique and tumour.
Is radiotherapy painful?
The treatment itself is painless, like having an X-ray. Discomfort comes from side effects in the treated area that build over the course, and these are managed with supportive care.
How much does radiotherapy cost abroad?
A full conventional course at an accredited international centre often falls in the low-to-mid thousands of euros, driven by the number of fractions and the technique. Always get a quote for the whole course, including planning.
Can I work and live normally during treatment?
Many patients do, though fatigue tends to accumulate toward the end of a course. Region-specific side effects may require adjustments, which your radiation oncology team can help you manage.
Why must I keep my radiation dose records?
Because each part of the body can only safely receive a limited lifetime dose of radiation. Your dose summary is essential for any future treatment decisions and must reach your home oncology team.
