Body secretes too much ADH.

End

These factors lead to increased sodium excretion and a shifting of fluid into cells.

ADH increases the permeability of renal tubules.

Increased permeability of renal tubules increases water retention and extracellular fluid volume.

Increased extracellular fluid volume leads to:

Reduced plasma osmolality

Dilutional hyponatremia

Diminished aldosterone secretion

Elevated glomerular filtration rate

Patient develops thirst,dyspnea on exertion, vomiting, abdominal cramps, confusion, lethargy, and hyponatremia.