What causes calcium to go too high?

my gf was released from the hospital today, her calcium was too high. nothing was wrong with her thyroid, she doesn't drink a lot of milk or other dairy products. she has diabetes, has only one kidney and her doctor is stumped. she is going tomorrow for a cat scan. my question is what else could cause calcium to go too high and other than dairy products what other foods have high calcium content. just looking for offt the top of your brain answers, I will be checking out calcium related websites, I mean you can list websites if you want but it's not necessary and you have my thanks

she has every symptom of hyperparathyroidism. I'm willing to bet thats what she has and I bet the cat scan tomorrow proves. it. I told her to mention this as soon as she sees her doctor tomorrow. No, I am not making
a diagnosis but given the available data and her symptoms, logic tells me that this is a very real possibility and is worthy of mentioning to the doctor. I am nervous as hell about this. She is pretty calm about it

The medical term is hypercalcemia. Usual causes are hereditary condition, or an overactive parathyroid due to unusual size or presence of a tumor. The cat scan will determine if the parathyroid is enlarged or if a tumor is present. If the parathyroid is ruled out as a cause, the next most likely cause is a cancer tumor somewhere that is producing parathyroid hormone. Breast cancer is one cancer that does this.

I"ve been told the answer by my doctor I suggest you do the same however it also may mean nothing

Hyperparathyroidism comes to mind. this endocrine gland is responsible for raising blood calcium levels and a tumor of the parathyroid gland will certainly raise it to alarming levels. Likely this is not due to diet. Rarely it can be caused by lytic bone cancers also. This does need to be investigated.

ithink with the history given,most likely to be hyperparathyroidism,if too high,how she can be discharged without any measures to control such high level?