Tonsillectomy is one of the commonest surgical procedures in ENT department. the post-tonsillectomy hemorrhage is a life-threatening complication. Many studies have been carried out on the possible effective factors influencing the post-tonsillectomy hemorrhage (PTH). This is a cross-sectional study, conducted on the children and adults admitted in Imam Khomeini Hospital of Ahvaz during a period of 13 years (2000 to 2014). The patients were divided into two groups of children (16 years or less), and adults (more than 16 years old). At first, a questionnaire was filled for each patient containing the individual information, as well as the information about the disease and description of operation. Then relevant data were analyzed. In this paper 384 patient records were investigated, of whom 34 (8.85%) cases were reported as PTH. The mean age of the patients experienced bleeding was 11.61 years; and the ratio of the patients of older than 16 to the patients of 16 or less was eight (23.5%) to 26 (76.5%). The female to male ratio was 15 (45%) to 19 (55%). In this study the majority of bleedings were secondary, and only 10 (30%) cases were reported as primary hemorrhage. There was no statistically significant difference in the rate of PTH between the adults and children patients. On the other hand, the length of anesthesia in adults was reported longer (mean = 95 min) than the children (mean = 62 min), indicating the absence of any significant difference. The necessity of performing more studies and investigations in post-tonsillectomy hemorrhage to obtain more proven and accurate results is indicated. Despite that the present paper revealed some information about this subject, performing more investigations in larger populations as well as prospective and controlled trials are suggested.