The field of neuroendocrinology has extended from the initial interest in the hypothalamic control of pituitary secretion to embrace multiple reciprocal interactions between the central nervous system and endocrine systems in the coordination of homeostasis and various physiological responses from adaptation to disease. Most recently, epigenetic mechanisms were recognized for their role in the development of the neuroendocrine axes as well as in the mediation of gene-environment interactions in stress-related psychiatry disorders.