Side effects depend on which part of the body is being treated, and plenty of people only have mild ones. Tiredness is the most common, and it tends to build up over the weeks. The skin in the treated area can turn red, dry, or itchy, a bit like a sunburn. Treatment near the head and neck may cause a sore mouth or trouble swallowing, while treatment near the stomach can upset digestio... https://www.amalaims.org/hospital/super-speciality/department/oncology