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Endocrinologists are medical doctors who specialize in treatment of disorders of the endocrine system. The endocrine system is a network of glands in the body that secrete hormones into the bloodstream. Among other things, hormones control growth, reproduction, metabolism, and blood sugar levels. Thus, endocrinologists treat a wide variety of conditions. Although endocrinologists may be nurses, physiologists, and educators (to name just a few), this article will focus on endocrinologists as a physician specialty.