Could hyper para thyroid disease turn into cancer?

Least of worries: Hyperparathyroidism is quite common (one person in 1000 will get it during a lifetime) and makes a person quite ill. About 1% of these cases are caused by a tumor that's already cancer -- usually not super-aggressive -- and this is one reason to operate sooner rather than later. If you are hyperparathyroid, know all your options -- some folks do choose observation.