The neuroendocrine system, which plays an important role in regulation of mood, is dysfunctional in patients suffering from mood disorders. In order to improve the quality of life for patients, additional research is needed to define clinical implications of neuroendocrine dysfunction in mood disorders. It would be important to define which specific hormonal responses that are blunted in affective disorders contribute to mood symptoms and which medications that normalize neuroendocrine function are conditioning the impact of mood symptoms. Consideration and evaluation of endocrine status result important in psychiatric patients, both to ensure proper diagnosis and adequate treatment.