The numerous glands in the human body hold varying functions. For the most part, however, their role is to secrete hormones to help regulate homeostasis. They can be categorized based on their location, what they secrete, or what organ system they control. Some common gland disorders, for instance those involving the thyroid, are often seen in the insurance industry. On the other hand, Parathyroid disorders are not as prevalent and therefore make an interesting topic for a medical underwriter to review.