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Lymph Nodes in Your Body~ Lymph nodes are body organs (not glands) spread throughout your body. Their function is to filter out all the dead bacteria, viruses, and other dead tissue from the lymphatic fluid and eliminate it from the body. They are also the place where the white blood cells (lymphocytes) spend much of their time. When the immune system is activated they begin producing large numbers of lymphocytes which causes them to swell.
Infected lymph node disease can also cause lymph node enlargement. For example, dental infections can cause lymph node enlargement below the jaw. The next example is tuberculosis infection that can cause lymph node enlargement, and there are still many other examples of infections that may vary in each country. The cause of the next lymph node enlargement is the malignancy of the disease that can be cancer.