Objective: The purpose of this study is to evaluate the relative risk of reoperation for recurrence linked with each individual problem and investigate and identify the factors that contribute to the incidence of postoperative complications following groin hernia surgery. Background: The assessment of groin hernia surgical outcomes has conventionally centered on the rates of recurrence and the duration of pain. Based on a population-wide registry, this observational study aims to determine the relative risk of reoperation for recurrence of each individual issue and identify risk factors for postoperative complications. Methods: A total of 155,412 herniorrhaphies were analyzed using data from the national Swedish Hernia Register from 1998 to 2009. Postoperative problems that happened less than 30 days (about 4 and a half weeks) after the surgery were the focus. Results: The incidence of postoperative complications was highly impacted by several risk factors. In comparison to the open anterior mesh reference category, laparoscopic repair (odds ratio [OR] 1.35, 95% confidence interval [CI] 1.24–1.47) and open preperitoneal methods (OR: 1.31, 95% CI: 1.15–1.49) demonstrated increased odds. With local anesthesia serving as the reference category, other noteworthy risk variables were general anesthesia (OR: 1.30, 95% CI: 1.23–1.37) and regional anesthesia (OR: 1.53, 95% CI: 1.43–1.63). Significant risk factors were also found for emergency procedures (OR: 1.53, 95% CI: 1.43–1.63), recurrent hernia repair (OR: 1.39, 95% CI: 1.27–1.52), femoral hernia (OR: 1.30, 95% CI: 1.14–1.48), age over 65 (OR: 1.26, 95% CI: 1.21–1.31), and surgery lasting longer than 50 minutes (OR: 1.27, 95% CI: 1.22–1.33).Conclusions: The open anterior approach and surgery under local anesthesia were associated with a lower risk of postoperative complications.