Is it possible to pass an 8mm kidney stone on my own?

Small chance: The chance of a kidney stone passing spontaneously is inversely related to stone size. According to studies, there is about a 10% chance of a 9 mm stone passing on its own. In practice, there is a generally accepted cutoff of 5 mm for which there is a reasonable chance (50-70%) of passing. Depending on individual level of pain and other factors, a urologist may opt for conservative management.

Yes, Half the time.: The chances of stone passage for stones 7-9 mm, 48%. So, about half the time, people with stones 8 mm in diameter will pass. Hopefully, there are no strictures of your ureter. Good luck.

Yes: It is possible to pass a stone of this size, however, the likelihood of passing a stone decreases as the stone size increases.