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When blood-calcium levels are too high, the parathyroid glands produce less parathyroid hormone.Ĭalcium is best known for its role in keeping your teeth and bones healthy.

This hormone raises calcium levels by releasing calcium from your bones, increasing the amount of calcium absorbed from your small intestine and decreasing the amount of calcium lost in urine.

When calcium levels in your blood fall too low, your parathyroid glands release enough parathyroid hormone to restore the balance.

Vitamin D also is involved in controlling the amount of calcium in your blood. This is similar to how a thermostat controls a heating system to maintain a constant air temperature. The parathyroid glands keep proper levels of both calcium and phosphorus in your body by turning the release of parathyroid hormone off or on. Hyperparathyroidism is caused by factors that increase the production of parathyroid hormone.

It's important to get a prompt, accurate diagnosis and the right treatment.

These symptoms could be caused by many disorders, including some with serious complications. See your health care provider if you have any signs or symptoms of hyperparathyroidism. Frequent complaints of illness with no clear cause.Weak bones that break easily (osteoporosis).Symptoms may be so mild and nonspecific that they don't seem related to parathyroid function, or they may be severe. This damage or dysfunction is due to high calcium levels in the blood and urine or too little calcium in bones. When symptoms do occur, they're the result of damage or dysfunction in other organs or tissues. This is usually because an elevated level of calcium is found on routine blood tests. Primary hyperparathyroidism is often diagnosed before signs or symptoms of the disorder occur.