Single-center patient-blinded randomized clinical trial comparing self-gripping mesh (Parietex ProGrip) and standard Lichtenstein method using lightweight polypropylene mesh. Patients will be randomly allocated to the Lichtenstein Operation (L) and ProGrip Repair (R) group. Patients will be followed for one year. The primary outcome measure are: postoperative pain using the Visual Analog Scale (VAS) and Numeric Rating Scale (NRS). Assessments will be made before the surgery, in the day of discharge, 1, 6 and 12 months postoperatively.