What is the difference between concomitant and concurrent radiation therapy?

Answer 1

They are often used interchangably. If you want to nuance the difference, concurrent has a bit more focus on the temporal aspect of coinciding at the same time, while concomitant has more focus on accompanying with a sense of lesser importance. From my sense of language I use concomitant for medication used at the same time, but unrelated to the patient's condition I am currently working on. For medical conditions that are present today but not the focus of my work, I use "concurrent diseases".