Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Primary Hyperparathyroidism ?
    ### Response:
    Primary hyperparathyroidism is a disorder of the parathyroid glands, also called parathyroids. Primary means this disorder originates in the parathyroid glands. In primary hyperparathyroidism, one or more of the parathyroid glands are overactive. As a result, the gland releases too much parathyroid hormone (PTH).
    