Hi and thanks for the query,
Fever with unknown cause could be fever of unknown origin (FUO). Before making this diagnosis, all possible diagnostic tests have to be done to rule out common viral, bacterial, tumoral, inflammatory and autoimmune causes of fever. This evaluation in an ideal situation should be done by a neurologist
. Long term fevers should always lead to exclusion of Tuberculosis
, pulmonary or extra pulmonary, sarcoidosis
, connective tissue
diseases and vasculitis. A complete blood count
might be very helpful in orienting towards an anemia or raised white blood cells counts. These could be gateways to suspect hematologic malignancies.
I suggest you book and appointment with an internist for a proper assessment.
Thanks and best regards,