Unfortunately, this happens far too often (about 2 to 3% of the time with a professional reversal surgeon, more often even up to 10% or more with a less skilled surgeon). It is called "scarring over". The vas deferens is only 3 cells wide if you put those cells side by side each other. You can understand how while healing the tube can become blocked again. Most scarring over happens between months 8 to 12 post reversal. You can only assume a man to have had a successful reversal WITH sustained fertility if he has good counts 18 months post reversal. Different things cause scarring over. Ejaculation too soon post reversal (before 2 weeks) can leak sperm between the stitches and cause irritation that leads to scarring. A poor reconnection by the reversal surgeon can lead to scarring. Using too large of stitches leads to scarring. And just being a "fast healer" tends to make a man scar more. Sometimes, it just happens. Some men do everything right and it happens; some men don’t follow their doctor’s instructions and they are fine and have wonderfully normal counts. It’s a roll of the dice. What do you do now? Sometimes a round of predisone and use of anti-inflammatory medicines can open up a narrowed vas deferens. Otherwise, you will need another reversal. This time, bank some sperm at the time of reversal just in case he scars over again. Also, use of anti-inflammatories and a course of antibiotics for the first weeks post reversal has been shown to help reduce scarring over. And use of vitamin E post reversal seems to help reduce it as well. GL

I had a varicose vein on a testicle causing low sperm count.