Hi, Let me start my answer with a small description of the kidneys, ureter and urinary bladder. The collecting system of the kidney is made of renal calyces and pelvis. This collects the urine formed in the kidney and transports it through the ureter (tubes connecting kidneys and urinary bladder) to the urinary bladder. I guess that you have got an ultrasound scan done and it shows hydroureteronephrosis, that is a term applied to increase in diameter of the ureter which carries urine from the kidneys to urinary bladder due to a stone from the kidney getting stuck in the mid or lower part of the ureter. Since you have a 3 mm stone in the ureter, it is possible that the stone is now in the lower part of the ureter. This is causing an obstruction and please drink adequate water to allow the stone to come out of the lower ureter and into the urinary bladder. You might have pain at this time which will disappear once the stone reaches the urinary bladder. When this happens you might experience severe sharp pain for few days and require pain killers for sometime. It is best to consult the urologist and take prescription of medications like alpha blocker which will cause contraction of smooth muscles in the ureter and cause the stone to travel down in to the urinary bladder. Doing kidney function blood tests and repeat ultrasound might also be required. Neeri syrup and Pathrina tablets are recommended by Ayurvedic doctors for kidney stones and work best as long the stones are in the kidneys. However, if the stone is stuck in the ureter as in your case then these medications will not be of much help because urinary obstruction is there. Continuous obstruction in ureters for more than a month can cause kidney damage. Hope I have answered your query. Let me know if I can assist you further. Regards, Dr. Ivan R. Rommstein, General Surgeon