How Do Kidney Stones Form? Kidney stones are formed due to supersaturation of urine. This leads to crystal formation and these further aggregate to form a kidney stone. The formation of kidney stone starts at the tip of calyces. The kidney stone may lie silently in the kidney or it may be symptomatic in the form of a dull aching pain in the flank. When the stone passes into the ureter, the pain is usually acute, colicky, travelling from the back to the abdomen and may radiate to the genitalia (depending on the size of the stone), while the stone in the bladder normally presents as pain in the lower abdomen, as a burning sensation while passing urine or as an interrupted flow of urination. For more information about kidney stone treatments visit kidneyurostonecentre.com