Hyperparathyroidism

Hyperparathyroidism happens when one or more of your four tiny parathyroid glands, located near the thyroid in your neck, become overactive. Their job is to keep blood calcium steady, so when they produce too much parathyroid hormone (PTH), they constantly signal your bones to release calcium into the bloodstream. Over time, this steady drain thins the skeleton, even though the original problem has nothing to do with exercise, diet, or how you use your bones day to day.

It's usually picked up through blood work rather than symptoms alone. A pattern of high-normal or high blood calcium together with a high PTH level is the classic clue that points to primary hyperparathyroidism. This is why calcium and parathyroid hormone are often tested together when a doctor is trying to explain unexplained bone loss, alongside checks like vitamin D, thyroid function, and kidney function.

The encouraging part is that this is considered a genuinely reversible cause of bone loss. Hyperparathyroidism is treatable, and with proper medical management, the excess calcium drain on your bones can often be slowed or reversed. Any decisions about testing, diagnosis, or treatment belong with your physician, who can interpret your specific lab results and recommend next steps.