The symptoms are often seen in extended field external beam therapy, whereas brachytherapy is limitied to much smaller areas of treatment so the side effects are usually much less. Nausea, though, is often dependent on where the radiation therapy
is being applied and is preconditioned by other variables like gastritis
(from the stress
of the diagnosis), gall stone presence, and emotions. In my experience, fatigue is usually related to external beam radiation and not to straightforward brachytherapy.