Up to 33% risk of occult contralateral inguinal hernia has been reported. This study aims to evaluate diagnostic and treatment modalities in the case of occult contralateral hernia and the role of ultrasonography (USG).Patients who had undergone inguinal hernia repair between 2009 and 2018 were studied retrospectively. The detection rate of occult inguinal hernia by USG and results of laparoscopic totally extra peritoneal repair (TEP) were evaluated.Of 295 patients, USG was performed to the contralateral site in 80 with clinically unilateral hernia and occult hernia was detected in 44 (55%). Bilateral TEP was performed for these patients. There was no recurrence and no significant complication.As it is noninvasive, easily accessible and has high sensitivity, USG is recommended in diagnosis. In the case of occult contralateral inguinal hernia, bilateral TEP is considered as a safe procedure. Thus, the need for a second operation and related complications can be prevented. We recommend routine USG to detect whether contralateral occult inguinal hernia is present.