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The most common cause of high blood calcium levels is overactivity in one or more of these four glands, which sit behind your thyroid, in your neck. If these glands are working right,...
Hypercalcemia is a condition in which the calcium level in the blood becomes too high. Too much calcium in the blood can weaken bones and create kidney stones. It also can affect the heart and brain. Most often, hypercalcemia happens after one or more of the parathyroid glands make too much hormone.
Hypercalcemia happens when you have higher-than-normal levels of calcium in your blood. It's usually caused by primary hyperparathyroidism or certain cancers.
Hypercalcemia can cause few or no symptoms. So, you might not know you have it until routine blood tests show a high level of calcium. Blood tests also can show whether your parathyroid hormone level is high, which could be a sign of hyperparathyroidism.
In hypercalcemia, the level of calcium in blood is too high. A high calcium level may result from a problem with the parathyroid glands, as well as from diet, cancer, or disorders affecting bone. At first, people have digestive problems, feel thirsty, and may urinate a lot, but if severe, hypercalcemia leads to confusion and eventually coma.
High calcium levels in the blood (hypercalcemia) can result from an overactive parathyroid gland, too much vitamin D, some medications, and various underlying conditions, including cancer.
The most common causes of hypercalcemia are overactive parathyroid glands or cancers such as lung cancer, breast cancer, lymphoma, and multiple myeloma (called hypercalcemia of malignancy).