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.
The lymph nodes of the head and neck, shown in green, may become swollen because of throat or sinus infections. Swollen lymph nodes are one of the first signs of illness. Lymph nodes usually become swollen due to bacterial or viral infections. A sexually transmitted disease may cause swollen lymph nodes in the groin.