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.
Painful Lymph Nodes in The Groin. There are hundreds of lymph nodes throughout the body that go unnoticed as they quietly do their job of filtering lymph. The lymph system is part of the immune system, and when it becomes overloaded, it can result in swollen lymph nodes. The location of enlarged lymph nodes will vary depending on the cause.