Endocrinology is concerned with study of the biosynthesis, storage, chemistry, biochemical and physiological function of hormones and with the cells of the endocrine glands and tissues that secrete them.
Endocrinology is a specialty of medicine, some would say a sub-specialty of internal medicine, which deals with the diagnosis and treatment of diseases related to hormones. Endocrinology covers such human functions as the coordination of metabolism, respiration, reproduction, sensory perception, and movement. Endocrinology also focuses on the endocrine glands and tissues that secrete hormones.
Some disorders lie very clearly and totally within the domain of the endocrinologists, being entirely or largely due to an abnormality of hormone production. This includes diabetes that is caused due to decreases secretion of insulin from pancreas (Type 1 diabetes) or hypothyroidism that is caused due to decreased secretion of thyroid hormone from the thyroid glands. Yet other diseases are not exactly of endocrine origin but have aspects of endocrinology in them. This includes examples such as osteoporosis or infertility. In these cases the endocrinologist may need to work with a physician or a gynaecologist and a multidisciplinary approach is appropriate.