Purpose <p>Long-term follow-up after groin hernia repair is inherently challenging, and procedure-based registries do not directly capture true recurrence rates. Using the hernia-specific data collection of the National Clinical Database (NCD), which records detailed information at the time of surgery for recurrence, this study aimed to clarify the timing and hernia types of surgically treated recurrent groin hernias, including very long-term reoperations following childhood repair.</p> Methods <p>Recurrence-related analyses were conducted using the hernia-specific data collection of the NCD. The analyses focused on annual surgical volumes of primary and recurrent groin hernia repair, the timing of reoperation and hernia type at reoperation among recurrent cases, and a predefined subanalysis of very long-term reoperations following childhood hernia repair.</p> Results <p>Recurrent surgeries accounted for 3.6–3.8% of all registered lesions each year (47,753 in 2022; 53,389 in 2023; and 56,140 in 2024). In men, medial inguinal hernias predominated among recurrent lesions, whereas femoral hernias were disproportionately frequent in women. Reoperations most commonly observed within two years but were also observed long after primary repair, including after mesh placement. Among patients with childhood repair, most reoperations occurred after age 60, predominantly for medial inguinal hernias, suggesting adult-type hernia development rather than true postoperative recurrence.</p> Conclusion <p>This large-scale, registry-based analysis delineates characteristic mid- to long-term patterns of surgically treated groin hernia recurrence and provides the first detailed evaluation of timing and hernia type following pediatric repair.</p>