Radiation therapy uses high-energy radiation to shrink tumors and kill cancer cells (1). X-rays, gamma rays, and charged particles are types of radiation used for cancer treatment.
1 Lymph nodes of the armpit and neck may also be involved. 2  Viral infections such as infectious mononucleosis may affect the whole body and cause generalized lymph node swelling in various parts of the body, such as neck, armpit or groin.
An infection is the most likely cause of swollen lymph nodes in the groin. When lymph nodes swell due to infection, it is usually related to the area of the body where the lymph node is located. In the case of the groin area, the infection might be linked to the genitals, the feet, or the legs.