Fever is an elevation of body temperature to a level above normal to greater than $37.2^{circ}C$. Fever of Unknown Origin is usually defined in adults as continuous fever at least 3 weeks duration with daily temperature elevation above $101.5^{circ}F(38.3^{circ}C)$ and remaining undiagnosed after 1 week of intensive study in the hospital. Diagnoses for Fever of Unknown Origin fall into three general categories: infectious disease, connective tissue disease, neoplasm. We experienced a cases of Fever of Unknown Origin which occurred after subarachnoid hemorrhage and intracerebral hemorrhage. As for treatment, we used Cheongleejagamtang-gami(淸離滋坎湯加味). Fever of Unknown Origin was improved within 5 days of the admission.