<unk>  is a symptom (evidence of a disease state), not a disease in itself. As it is often accompanied by polyuria, investigations directed at diagnosing diabetes insipidus and diabetes mellitus can be useful. Blood serum tests can also provide useful information about the osmolality of the body's extracellular fluids. A decrease in osmolality caused by excess water intake will decrease the serum concentration of red blood cells, blood urea nitrogen (BUN), and sodium.
Polydipsia
Nocturia
Polyuria
Adipsia
Dysuria
Hypersthenuria
Hyperchlorhydria
Hyperosmia