03/31/2026
Low vitamin D is often treated as a simple deficiency—but in patients with primary hyperparathyroidism, it may actually be a sign of an underlying parathyroid tumor.
In this condition, the body lowers vitamin D levels as a protective response to high calcium. Aggressively supplementing vitamin D before addressing the root cause can increase calcium levels further, potentially worsening symptoms and delaying a curative diagnosis.
The key is context. When calcium is elevated, treating the tumor, not the vitamin D level, is typically the safest and most effective approach. After successful parathyroid surgery, calcium and vitamin D metabolism often normalize naturally.
Understanding this relationship is critical to avoiding unnecessary delays and preventing ongoing complications affecting the bones, kidneys, and overall health.
🔗 Read the full article: https://www.parathyroid.com/blog/hyperparathyroidism-and-vitamin-d-why-supplements-are-not-always-the-solution