My dad has a sed rate over 100, night sweats, and continuous fevers.  No other symptoms.  All other blood work is normal.  He has had 2 extensive physical exams and the doctors have not found anything.  Chest xray was negative. Urine and blood cultures negative.  He is very healthy...good diet, works out everyday.  No other health issues.  Is it possible that this is an exotic infection of some sort...or more likely lymphoma?
Lymphoma is very likely diagnosis.... Pls get done Contrast ct scan of chest with abdomen.to see any enlarged lymph node... Or biopsy from any palpable lymph node over body surface.... One of other possibilities are tuberculosis... which also present with nighttime fever with high ESR... Sputum examination if cough is there... or serum ADA level would be useful...