Antidiuretic hormone mainly has the effect of antidiuretic, but also has the effect of elevating blood pressure, promoting the release of adrenocorticotropic hormone and so on. 1. Antidiuretic effect: antidiuretic hormone can improve the permeability of renal tubules to water, promote water reabsorption, reduce the production of urine, so it has the role of antidiuretic, can regulate water metabolism in the body, to maintain the fluid balance in the body has important significance. 2. Elevate blood pressure: antidiuretic hormone can make blood vessels and visceral smooth muscle contraction, increase peripheral vascular resistance, elevate blood pressure. In addition, promote water reabsorption, reduce urinary excretion, increase blood volume, can also elevate blood pressure. 3. Excitement of adrenocorticotropic hormone release: antidiuretic hormone has adrenocorticotropic hormone-releasing factor-like to promote the release of adrenocorticotropic hormone, may be a direct effect on the anterior pituitary gland and stimulate the release of adrenocorticotropic hormone. If the secretion of antidiuretic hormone is dysregulated, i.e., abnormal increase in secretion or enhancement of its action, it can lead to water retention, increase in urinary sodium excretion and dilutional hyponatremia, etc., and if the relevant indexes are abnormal again and again, it should be timely to consult a doctor in the hospital.