Final answer:
Hypernatremia is an abnormal increase in blood sodium levels, which can occur when there is a loss of water from the blood or hormonal imbalances involving ADH and aldosterone.
Step-by-step explanation:
Hypernatremia is an abnormal increase of blood sodium. It can result from water loss from the blood, resulting in the hemoconcentration of all blood constituents. Hormonal imbalances involving ADH and aldosterone may also result in higher-than-normal sodium values.