When I ejaculate I get left testicular pain /u/SoftOriginal1810 Sex

For about the last six months when I ejaculate during sex or masturbating not every time but most I get an uncomfortable pain in my left testicle during ejaculating Any ideas what this could be

For about the last six months when I ejaculate during sex or masturbating not every time but most I get an uncomfortable pain in my left testicle during ejaculating Any ideas what this could be