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Inflammatory and infectious conditions

Why in inflammatory and infectious conditions might clinical signs associated to the lymphatic system take place?

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The lymph nodes, or lymph glands, contain lymphoid tissue which generates lymphocytes (a kind of leukocyte). In infectious and inflammatory conditions, the enlargement of lymph nodes of lymphatic circuits which drain the affected area due to the reactive proliferation of leukocytes is very common. This enlargement is termed as lymphadenomegaly and at times it is accompanied by the pain. The search for painful or enlarged lymph nodes is a part of the medical examination as such findings might recommend inflammation, infection or other diseases.

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