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.
Swelling of the lymph nodes in the groin could point to a localized infection in that part of the body, such as an abscess, boil or cut on the skin. An injury, such as a puncture wound, sprain, strain or bone break near the groin, may cause swollen lymph nodes. A sudden inflammation of lymph nodes usually means an injury or infection.