Endocrinology specializes in treating the endocrine system. The endocrine system includes all the glands of the body that produce hormones. Endocrinologists diagnose, treat, and manage disorder like menopause and andropause, osteoporosis, diabetes, thyroid issues, adrenal problems, infertility, pituitary abnormalities, and much more. Endocrinology involves a great deal of internal medicine simply because problems can originate elsewhere outside the glandular endocrine system yet adversely influence the function and production of these hormones.