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.
Swollen lymph nodes in the groin may be the result of an injury. A sexually transmitted disease may cause swollen lymph nodes in the groin. The lymphatic system, shown in green. Leg injuries may cause lymph node swelling. Swollen lymph nodes in the groin are no reason to panic, as they're usually related to infections or injuries.