What can cause dull one-sided scrotal pain after ejaculation? this happened before but an ultrasound ruled out torsion and epididymitis problems. had opposite side inguinal hernia surgery a couple years ago and a hydrocelectomy 15 yrs.ago?

You should see your urologist again. That symptom could be a manifestation of chronic pelvic pain syndrome and chronic prostatitis can be the cause.

There can be many reasons from causes in the testicle, epididymis, vas or the prostate and requires a good clinical exam and appropriate testing by a urologist. but does not seem from a ny serious reason. Hope you feel better.

There are several reasons for pain after intercourse or scrotal pain. May be infection, varicocele or back issue, post vasectomy . post surgery, intermittent torsion, hernia or interstitial cystitis as well as others see below. F/u/w/ urology. https://www.healthline.com/health/mens-health/painful-ejaculation https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4294852/