To determine changes in semen and clinical parameters following varicocelectomy. Prospective comparative study conducted on 30 Methods: patients at Santosh Medical college and hospital, Ghaziabad., undergoing varicocelectomy. Study aimed at comparing the semen analysis and various clinical parameters (pain VAS score and size of the swelling) postoperatively, at 3 month and 6 monthly follow up. Semen pH Results: value and total semen volume did not show any statistically signicant improvement postoperatively. Post operatively statistically signicant improvement was seen in total sperm count, motility as well as sperm morphology. The improvement was more when preoperative parameters were in lower range compared to normal range parameters. 7 patients who were oligospermic preoperatively showed marked improvement in their sperm count at 3 and 6 months respectively(p value 0.001); which is more signicant improvement than preoperatively normospermic patients (p value 0.003). Postsurgery sperm motility showed signicant improvement, better results were seen when preoperative motility was < 28% versus when motility was >28%. Signicant improvement in sperm morphology postoperatively(p value 0.001)was seen, with better results in patients with preoperative sperm morphology <3% versus >3%. Mean VAS score showed statistically signicant decrease at 3 months and at 6 months postoperatively (p value 0.001).83.3% patients were relieved of pain at 6months follow up post surgery. Of the 12 patients who presented with swelling, 11 patients showed signicant decrease in swelling size at 6 months follow up postoperatively. We advice varicocelectomy Conclusions: in all patients of varicocele who are either clinically symptomatic with scrotal pain and swelling, and also in asymptomatic patients with subnormal semen parameters.