An Endocrinology specialist is called a Endocrinologist. The endocrine system consists of several glands (groups of cells), in different parts of the body, which discharge hormones directly into the bloodstream. Hormones have many different important functions and ways of acting on organs of the body. Endocrinology involves the diagnosis and treatment of diseases and conditions associated with hormones. This may include such areas as diabetes, osteoporosis and Paget’s disease; thyroid diseases; sex hormone imbalances; growth and development disorders; and disorders of the pituitary gland.