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.
Another common cause of swelling in the groin area are swollen lymph nodes. Most often we do not notice these glands, but when they are swollen, or enlarged, they become evident to us. Lymph nodes are important part of the immune system and are located regionally throughout the body.