Just had a parathyroid removed. I didn't know I had any until 6 weeks ago. Parathyroids regulate calcium in the blood. My doc couldn't believe with my kidney stone history nobody checked that before. (I've had about 10 over the last 35 years). So if you get kidney stones, have your doc check your blood calcium level. Besides leaching calcium from your bones, high blood calcium can kill you over the long term by thickening your blood.