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.
Bacterial infections of the skin and subcutaneous tissue, muscles and bone of the leg or pelvis may also cause swelling of the groin lymph nodes. Toxoplasmosis caused by the parasite Toxoplasma gondii may also result in swollen lymph nodes.