Aim of the Authors' research was to evaluate advantages of day-surgery treatment for inguinal hernias. The study has been performed on a series of 138 patients, operated because of unrelapsed and uncomplicated monolateral inguinal hernia. Up-to-date therapeutic behaviour relating to hernia is the result of brilliant intuitions: technical order (tension-free repair), technological progresses (using new prosthetic materials), and refinement of anaesthesiological procedures (local and loco-regional anaesthesia). As regards surgical and anaesthesiological methods, general principles have been accepted by now from the most of the Authors. The new frontier of hernias' treatment is the possibility of operate in a day-hospital way: that means real advantages, both as regards patients' compliance and, in consideration of the high incidence of such pathology, as regards the high economic savings and more reasonable management of hospital stays. The significative increase of day-hospital hernioplastic operations in last years is due to standardization of restrictiveless criteria of choice for patients who can be treated with such modality.