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 Infection. 2  This is the most common cause of a swollen lymph node in the groin. 3  The inguinal lymph node may enlarge because of infection caused by trauma, burn, chemical injury, insect bites and folliculitis in the groin region.hese lymph nodes in the groin area are called inguinal lymph nodes and they are formed as tissues that filter the lymphatic fluids and bacteria travel through the body. Lymph nodes play a critical role in the immune system and they can swell in the groin area due to different causes. 1  Infection.