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.
When there are painful lymph nodes in the groin (inguinal lymph nodes) it can be caused by a simple infection that the body is fighting or by something more serious like cancer. Only a doctor can determine the cause of painful and swollen lymph nodes in the groin.