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Background: The incidence of occult inguinal or Spigelian hernias found in other laparoscopies is seldom studied and their development to symptomatic hernias is unknown. Materials and Methods:The orifices of all inguinal and Spigelian hernias at linea semilunaris were carefully recorded prospectively in the laparoscopic surgery during the years 2003-2004 (104 cholecystectomies, 55 fundoplications, 36 diagnostic, and 6 miscellaneous). The patients were followed up over 15 years to find out how often the detected occult hernias at index laparoscopy become later symptomatic and were repaired.Results: The index laparoscopic operation was performed to 201 patients with a mean age of 53 ± 14 years. The overall frequency of unexpected hernias was 21% including 36 (18%) inguinal hernias, 5 (2.5%) Spigelian hernias, and 2 (1.0%) ventral hernias. At the index laparoscopy, only 5/201 inguinal and 2 Spigelian hernioplasties were concomitantly undertaken. After 15 years, data of 169 patients were available and new hernia repairs were performed only in 8 (4.7%) patients (2 inguinal, 4 umbilical, and 2 ventral hernias).Conclusions: Asymptomatic occult hernias detected during laparoscopic surgery of other reason evolve very seldom (< 5%) to symptomatic and need to be repaired.