Purpose: The aim of this study is to evaluate the incidence and characteristics of tonsillectomy complica-tions, especially about postoperative hemorrhage. Materials and Methods: This study was performed by reviewing the chart of patients who had been operated tonsillectomy in the Cheongju Hankook hospital from 1997 to 2006. Results: Postoperative hemorrhage was occurred to 13.66% of patients. 9.76% of patients had a mild hemorhage but, 3.9% of pateints had a severe hemorrhage which was controlled under general anesthesia. Conclusion: Post-tonsillectomy hemorrhage can lead to expire of patient if uncontrolled. So, operator should have thorough knowlegde about anatomy of tonsil and, manage the complication.