This condition is medically known as lymphofollicular hyperplasia, but the symptom is not that complicated. Basically, your lymph nodes produce more white blood cells to fight an infection. Because of the presence of additional cells, the lymph node areas swell. These same white blood cells are always working with your immune system to prevent viruses, bacteria, and other germs from entering your bloodstream and causing disease. Lymph nodes are located in various parts of your body and the ones closest to the infection site may become swollen if you have cat-scratch disease.

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