Lemierre syndrome is characterized by pharyngitis followed by Fusobacterium necrobacillosis sepsis complicated by internal jugular vein thrombosis and infectious metastatic abscesses. It has been considered to be a rare disease until the last decade when a larger number of cases have been reported. We discuss a case of Lemierre syndrome in a 17-year-old girl and review the pathophysiology of Fusobacterium necrobacillosis and diagnosis and treatment of Lemierre syndrome.