The patient presented with prolonged fever of unknown origin. His fever pattern was fluctuating and did not reach baseline, suggestive of a remittent fever. His history revealed no exposure risks, localized infections, or symptoms to suggest infectious, inflammatory, or malignant causes of fever. On examination, he had no abnormal findings except for mild splenomegaly. Differential diagnoses included viral infections, infective endocarditis, and lymphoma. Further investigations were needed to determine the cause of his prolonged, remittent fever.