Causes of high blood calcium levels include

High blood calcium is not normal. If you have a blood test that shows high blood calcium, then you must check it out. High blood calcium is never normal to have high calcium levels in your blood. Hypercalcemia is the medical term for high blood calcium. 


high blood calcium



As you will see, over 99% of all cases of too much blood calcium are due to a small tumor on one of your parathyroid glands causing a disease called hyperparathyroidism. Causes of high blood calcium levels include:

Primary hyperparathyroidism: 

 People with primary hyperparathyroidism usually have a benign tumor of the parathyroid glands. Primary hyperparathyroidism is the most common cause of high blood calcium levels.


Cancer:   
Cancer is the second most common cause of high blood calcium levels, and has nothing to do with the parathyroid glands.  Types of cancer include cancers of the lung, kidney, ovary, uterus,  breast, esophagus and mouth.


Kidney disease:
High blood calcium levels can be found in people with slow or reduced kidney function, including those on dialysis and those who have had a kidney transplant. Kidney disease is the 3rd most common cause of high blood calcium levels