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.
1 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. 2  Toxoplasmosis caused by the parasite Toxoplasma gondii may also result in swollen lymph nodes.