Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Parathyroid Disorders ?
    ### Response:
    Most people have four pea-sized glands, called parathyroid glands, on the thyroid gland in the neck. Though their names are similar, the thyroid and parathyroid glands are completely different. The parathyroid glands make parathyroid hormone (PTH), which helps your body keep the right balance of calcium and phosphorous.
    