Enlargement (hyperplasia) of two or more parathyroid glands accounts for most other cases. A cancerous tumor is a very rare cause of primary hyperparathyroidism. One or more of the parathyroid glands produces high amounts of parathyroid hormone. This leads to high calcium levels and low phosphorus levels in your blood.

Care Overview The pituitary gland is located at the base of your brain, below your hypothalamus. What is the pituitary gland? Your pituitary gland (also known as hypophysis) is a small, pea-sized gland located at the base of your brain below your hypothalamus. It sits in its own little chamber under your brain known as the sella turcica.