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Lymph node presentation & testing

Are there blood tests that could reveal whether enlarged lymph nodes may be cancerous without having to have biopsies first? Can stress cause enlarged lymph nodes? If WBC is not elevated with enlarged lymph nodes does that rule out infectious causes? Can enlarged lymph nodes be result of injury to or near the area where they are enlarged? When people present with enlarged lymph nodes is it normal to see them enlarged in more than one area of the body (neck / groin)?
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