What Causes Hypernatremia?

In general when we think about hypernatremia we want to think about water losses exceeding water intake. In terms of the losses the things I think about are skin losses, GI tract losses and renal losses. With renal losses you can have things like a diabetes and sipitous which can be central or nephrogenic. The other thing I think about with respect to free water intake is your ability to respond appropriately.