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.
The cause for swelling of the enlarged lymph nodes in the groin may be due to a drug reaction, allergic reaction, benign cyst, cancer (lymphoma, testicular), hernia, fatty growths (Lipomas), infections in the legs, feet, or pelvic area, and STDs (sexually transmitted diseases).he most common cause for enlarged or swollen lymph nodes in the groin and other parts of the body is an infection. The groin area is mainly where the abdomen ends and the legs begin. Also called the inguinal area, the groin area includes the upper inner thigh and the front area where the legs are attached to the torso.