6. Enlarged lymph nodes
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Finally, it is vital to address enlarged lymph nodes as an early sign of specific cancer types. Each one of them has a primary lymph node in which they typically drain, and doctors study and use this pattern to identify potential problems in apparently healthy patients. This does not mean that every enlarged lymph node can be caused by cancer. As noted above, it is an intricate pattern that doctors need to study and apply in their clinical practice, and some of those lymph node enlargements can only be seen by imaging studies or surgery.