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.
Swollen glands. If you have an infection or illness, such as a cold, flu, or mononucleosis, your groin lump could be a swollen lymph gland. Typically, these will flare up at the same time as the lymph glands located in your throat or armpits flare up.