If a person has too much calcium in his blood. What and gland is most likely working incorrectly?

If a person has too much calcium in their blood, the parathyroid glands are most likely working incorrectly. These glands regulate calcium levels by producing parathyroid hormone (PTH), which increases calcium in the bloodstream. Overactivity of the parathyroid glands, often due to a condition like primary hyperparathyroidism, can lead to elevated calcium levels, potentially causing various health issues.