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 Lymph Nodes Overview. Lymph nodes (erroneously called lymph glands) are a part of the lymphatic system, a component of the body's immune system.Swollen lymph nodes may signal an infection. There are several groups of lymph nodes, which are small, bean-shaped, soft nodules of tissue.The ones most frequently enlarged or swollen are found in the neck, under the chin, in the armpits, and in the groin.wollen lymph nodes may signal an infection. There are several groups of lymph nodes, which are small, bean-shaped, soft nodules of tissue. The ones most frequently enlarged or swollen are found in the neck, under the chin, in the armpits, and in the groin.