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Lymph nodes, also known as lymph nodes, are tissues that play important roles in the body's defense system. The lymph node helps remove bacteria or viruses that enter the body before they can cause infection or other diseases. Lymph node swelling generally occurs as a result of infection caused by bacteria and viruses. Lymph node swelling can manifest itself as tenderness, pain, and a palpable lump in the areas where the lymph tissues are located.