Below is an instruction from Human. Write a response.
    ### Instruction:
    What to do for What I need to know about Kidney Stones ?
    ### Response:
    - A kidney stone is a solid piece of material that forms in a kidney when there are high levels of certain substances in the urine. These substances are normally found in the urine and do not cause problems at lower levels.  - Kidney stones are caused by high levels of calcium, oxalate, and phosphorus in the urine.
    