Radiotherapy works by damaging the DNA of cancer cells. This damage kills the cells and prevents them from growing again. 

The healthy cells that were damaged recover quickly after each dose of radiation. 

Unlike chemotherapy, radiation does not cause cell damage throughout the body. It only damages cells in the area of the body where radiation is given. 

How it works:

1. The radiation is directed at the cancer cells, which slowly die and fall apart
2. The body’s own defense system gets rid of the dead cancer cells
3. The healthy cells help reshape the tissues in the body where the treatment is given.