High blood calcium levels: Signs of hypercalcemia include memory loss and forgetfulness

The Mayo Clinic says hypercalcemia is usually a result of overactive parathyroid glands.

It says these four tiny glands are situated in the neck, near the thyroid gland.

The organisation says some other causes of hypercalcemia include cancer, certain other medical disorders, some medications, and taking too much of calcium and vitamin D supplements.

Indeed, the organisation says one of the main consequences of vitamin D toxicity is a buildup of calcium in your blood, which can cause nausea and vomiting, weakness, and frequent urination.