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.
1 This is the most common cause of a swollen lymph node in the groin. 2  The inguinal lymph node may enlarge because of infection caused by trauma, burn, chemical injury, insect bites and folliculitis in the groin region.