Kidney stone 6x4mm belongs to relatively small stones, mm is the unit millimeter, 6x4mm represents the kidney stone is roughly 6mm x 4mm stones. Kidney stone 6x4mm belongs to small stones, generally for this kind of small stone you can try to let it be discharged naturally by drinking more water and other methods. In addition, you can also take oral scopolamine and other drugs to relieve the spasm of ureteral smooth muscle; oral tamsulosin and other drugs to relax the smooth muscle of the lower part of the ureter, to promote the discharge of stones; oral sodium hydrogen potassium citrate, sodium bicarbonate alkalinization of the urine, to dissolve uric acid stones and cystine stones. For the treatment of kidney stones, stones with diameter less than 6mm can be discharged naturally by drinking more water; for stones with diameter greater than 6mm and less than 12mm, they can be treated by extracorporeal shock wave lithotripsy; for stones with diameter greater than 12mm, they can be treated by percutaneous nephrolithotripsy, ureteroscopy and other methods of lithotripsy. The above drugs should be used under the guidance of a doctor. If the examination found that the kidney stone is 6x4mm, it is recommended that the patient go to the regular hospital in time for treatment, and strive for early recovery.