Clinical endocrinology is the study of the endocrine system, its function, and its diseases or abnormalities as related to patient care. In other words, a clinical endocrinologist would spend most of his/her time seeing patients who have one or more disorders of the endocrine system. The endocrine system can be defined as those organs in the body which release hormones that regulate many of the body’s functions, like the testes and ovaries, the pancreas, the pituitary gland , and the thyroid gland. Those who specialize in clinical endocrinology are highly trained physicians. Additional conditions, on which clinical endocrinology concentrates, include thyroid disorders , which may have significant effect on all body functions when ignored. Hormone disorders of other types can be treated by endocrinologists. Problems with estrogen of progesterone production in the female body could cause many symptoms like reduced fertility .