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There is no co relation between the lymph node and nodule of thyroid
as the lymph node has been there for more than 6 years. Swollen lymph nodes
do become worrisome if they increase in size, or become tender or become hard and not movable. If the lymph node is not showing any of the mentioned features, you do not have to worry about it. However, the nodule on thyroid needs to be investigated and treated appropriately.