The presence of swollen lymph nodes may indicate the Epstein-Barr virus. The lymph nodes are small, bean-shaped glands that help filter impurities from the blood, including viruses and infections. They become swollen when they are working harder in this capacity. Gently massaging areas where lymph nodes exist, such as behind the jaw and in the armpit, can indicate inflammation. Often, these spots will also be tender.

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