Kidney stone - what will happen if kidney stone left unremoved.aside from pain would it cause kidney failure or other complications.?

Kidney stone: It depends on where the stone is. If it ends up blocking the tube that leads out of the kidney or from the bladder, it can cause further pain and can lead to kidney disease (from obstruction). Some stones can cause scaring in the kidneys. Often stones will pass on their own with enough hydration if they are small enough. If not, they may need to be removed or broken up.

Size and location: Kidney stones are somewhat unpredictable, but size and location are important factors. Stones may block your kidneys and cause infection and loss of kidney function and this process is not always painful. The decision to observe stones should be done in consultation with a urologist.