Stereotactic radiotherapy targets the tumour very precisely and the risk of damage to normal surrounding tissues is low. Therefore the side effects may be less than with other types of radiotherapy.
Unfortunately you can still have side effects. As with any external beam radiotherapy, the side effects only affect the part of the body that the radiotherapy treatment is aimed at. However it has been found that side effects appear differently on different patients. Symptoms of its side effects may differ depending on cancer site, direction of radiation, and radiation dose.
It is important to discuss with your oncologist before the treatment and fully understand the possible side effects/adverse reactions and how to manage them when they actually appear.