What is Radiotherapy?
Radiotherapy is a common, effective cancer treatment that doctors have used for decades. This page explains simply what it is, how it works, and why it is safe for the people around you.
Under physician review
A precisely aimed energy treatment
Radiotherapy uses highly focused energy beams β similar to imaging X-rays but stronger β to destroy cancer cells in a specific part of the body.
You cannot see, hear, or feel the beams during a session, just like having an ordinary X-ray.
The treatment is aimed at the tumor with high precision, while the surrounding healthy tissues are protected as much as possible.
How does it work?
Radiation damages the genetic material inside cancer cells so they lose the ability to divide and grow; they then die and the body gradually clears them away.
Healthy cells are affected too, but they are much better at repairing themselves than cancer cells.
That is why treatment is usually divided into small daily sessions (called "fractions"): the tumor takes repeated hits while healthy tissue gets time to recover between sessions.
Am I radioactive? Am I a risk to my family?
In external beam radiotherapy (the most common type), radiation passes through the body only during the session β none of it stays behind.
You are not radioactive after a session: you can hug your children, sit with someone who is pregnant, pray in congregation, and sleep next to your spouse in complete safety.
Some internal treatments (such as brachytherapy with implanted sources) have special instructions β if your treatment is of that type, your team will explain the details clearly.
Who takes care of you?
A full team stands behind your treatment: the radiation oncologist who designs your plan and follows you up, medical physicists who verify the accuracy of every dose, radiation therapists who deliver your daily sessions, and nurses who help you manage side effects.
At every step of your journey there is someone you can ask β never hesitate.
Common fears⦠and the facts
Common fear
βRadiation will burn my whole bodyβ
The fact
Treatment is aimed with millimetric precision at one specific area only; it may cause local skin redness similar to mild sunburn, which is easily managed.
Common fear
βI will become radioactive and harm people around meβ
The fact
With external radiotherapy no radiation stays in your body after the session β you are completely safe around your family and children.
Common fear
βThe session will be painfulβ
The fact
The session itself is completely painless β exactly like having an X-ray. All you do is lie still for a few minutes.
Common fear
βAll my hair will fall outβ
The fact
Radiation affects hair only in the treated area; chest treatment, for example, does not cause head-hair loss. Ask your doctor what applies to your area.
Important notice
This platform is for explanation and education only and does not replace medical advice. Your treating physician is the final source of truth for your condition and treatment plan. Do not make any treatment decision based on this content alone.