Roentgentherapy is a medical term used to describe the use of X-rays for treating various illnesses and ailments. However, there are several synonyms that can be used in place of the term roentgentherapy. These include X-ray therapy, radiology therapy, radiation therapy, and radiotherapy. All of these terms refer to the same medical procedure of using high-energy radiation to destroy or shrink cancer cells and tumors. While each term may be used in different regions, they all refer to the same medical treatment. Patients undergoing roentgentherapy or any of its synonyms may experience side effects, which can be discussed with their medical team.