The parathyroid gland sending out PTH to ask for calcium is like a mom telling her teenage son to pick up his socks off the floor. If he does it the first time she asks, everything is good. If she has to ask a second or third time, she’s going to raise her voice. And if she keeps asking and the socks stay on the floor, she is going to scream at the next person who walks into the house and forcibly take their socks. Your parathyroid glands will steal eventually calcium from your bones.