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 lymph nodes swell, causing the nodes to enlarge, forming a lump and tenderness in the groin area. These lymph nodes in the groin area are called inguinal lymph nodes and they are formed as tissues that filter the lymphatic fluids and bacteria travel through the body. Lymph nodes play a critical role in the immune system and they can swell in the groin area due to different causes. 1  Infection. 2  Adverse drug reaction. 3  Lymphedema. 4  Hernia. 5  Cancer. 6  Testicular torsion. 7  Hydrocele.