Aim: The aim of the study is to evaluate the effect of mechanical temporal summation on prediction of postoperative pain in open inguinal hernia repair patients. Methods: Twenty five male subjects undergoing open hernia repair were included in this prospective study. Vonfrey filament (#6.45) 180G was used to elicit mechanical temporal summation on volar aspect of the dominant forearm of all the patients preoperatively. First and last stimuli pain rating was assessed using 101 point numerical pain scale. mTs was presumed to be present if the value of the last stimuli is higher than the first (mTs >0). VAS for anxiety is used to assess the level of anxiety. Postoperatively, vas scores for pain and analgesic consumption were recorded. Results: Out of 25 patients, 20% showed mTs more than ‘0’ (>0). Their pain scores both at rest and sitting and analgesic consumption are greater than the mTs (=0) no change patients which is statistically significant. Conclusion: Assessment of preoperative mechanical temporal summation is significantly correlated with the level of VAS scores both at rest and sitting. Analgesic consumption also considerably increased. Thus vonfrey filament is a simple, bedside tool for predicting postoperative pain and analgesic consumption.