What increases urinary calcium and makes bone loss worse?

Parathyroid hormone (PTH) increases urinary calcium and makes bone loss worse. PTH is a hormone produced by the parathyroid glands, which are located near the thyroid gland. PTH helps to regulate calcium and phosphorus levels in the body. When calcium levels in the blood are low, PTH is released, which causes the kidneys to reabsorb more calcium from the urine and the bones to release calcium into the blood. This helps to increase calcium levels in the blood. However, when PTH levels are too high, it can cause too much calcium to be reabsorbed from the urine and released from the bones, which can lead to bone loss and an increased risk of fractures.