Lymph nodes can be indicative of inflammation, infection or cancer. It may be possible that the sweating is related (in the rare case of lymphoma - cancer of the lymph nodes).
I would be tested for various forms of infection - such as an HIV test as well as a PPD for tuberculosis. Blood cultures can also be considered - since endocarditis (infection of the heart valves), can lead to sweating and enlarged nodes.
Blood tests looking at the liver, kidneys, blood count, and thyroid should be done.
Regarding cancer screening - ensure your routine tests are uptode (mammogram, pap smear, colon cancer after age 50). A biopsy of the lymph nodes can be considered for a more definitive diagnosis.
These options can be discussed with your personal physician.
Followup with your personal physician is essential.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.
Kevin, M.D.
kevinmd_b