A 0.6 cm stone is a stone with a maximum diameter of 6 mm, the size of a green bean. However, stones are not as smooth as a green bean and may appear angular, so they are more likely to stay within the kidney or ureter or arise in the gallbladder and are not easily expelled from the body. Most of the kidney stones are formed when the urine is overly concentrated and the urine is overly saturated with components. Therefore, in the early stage of stone formation, the crystals mainly appear as crystals in the kidney, which are very small in size, but the crystals become condensation nodules of stones when they exist for a long time, and the causative factors are not yet removed, and stones are formed by gradual precipitation on the basis of the condensation nodules. Initially, the crystals are attached to the mucosa of the kidney, and as the size of the stone increases and the urine slowly flushes, the stone falls into the renal calyces or into the renal pelvis, which can move with the urine and cause obstruction in the ureter, and then painful symptoms can occur.