Thanks for the query.
I understand your concern.
According to your description there is a possibility of conditions like anemia, infections like tuberculosis especially lymph node tuberculosis, mononucleosis, rare causes like Hodgkin's lymphoma etc.
By clinical examination and investigations like complete blood picture, fine needle aspiration biopsy from the lymph node etc, the possible cause of your problem can be identified and treated.
So, please do consult your doctor and get evaluated.
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