It can take weeks!: About 80% of stones smaller than 4 mm will pass on About 80% of stones <4mm pass on their own...the bad news is that it takes time...an AVERAGE of 31 days! You need to be working with your urologist on potential interventions: removing the stone with a scope (ureteroscopy) or placing a stent in the ureter to hold it open more widely enabling passage. Sorry you're dealing with this...hang in!
Answered 3/9/2016
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