The anatomy of the urinary system is such that urine formed in the kidney is transported to urinary bladder by a narrow tube called ureter.
Size is the limiting factor for natural passage of kidney stone through this narrow passage. Ureter can accommodate around 4 mm diameter stones. For 3 to 4 mm multiple kidney stones, there is a high likelihood of spontaneous passage of the stone. As size progressively increases, the chance of stone getting stuck increases. It requires some procedures to clear the kidney stones.
Regular high fluid intake and healthy physical activity in patients carrying small multiple stones may help in spontaneous passage of stones. But, they need to remain alert to some of the danger signs to seek urgent medical help.
Do not get worried if recently diagnosed on ultrasound for health checkup with small kidney stones. Likelihood of spontaneously passing a stone less than 5 mm size is 77% whereas for greater than 5 mm is 46%. Interval of the stone passage is highly variable and dependent on the stone size and location. About 40 days are required for stones of 2 to 6 mm in size to pass.
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