Did you ask why you were not told?
calcium: both
Too low affects just about everything in the body. Especially brain, heart, lungs.
Too high also affects a lot, think "calcifications", stones of any kind, anywhere.
But.. you need vitamin D to get the body to absorb and use the calcium.
The Parathyroid glands main function is to make and push out calcium if it gets signals from the body that calcium levels are not correct.
Parathyroid.com has an excellent website with lots of info and a great calculator. Also, swparathyroid.com has great info.
I am using both. I am using swparathyroid.com for a comprehensive second opinion.
Tumor(s) can grow on the PT gland and incorrectly make extra calcium, or the tumor can be cancer, usually it's not cancer.
I have now had formal diagnosis of secondary HPT, caused and found with celiac disease. Now I have a primary diagnosis, which probably means I have to have the surgery, minor, but it is the only way to treat.