<unk>  production is a condition in which the body develops an excess of water and a decrease in sodium concentration. It may be caused by central nervous system diseases, cancers, pulmonary diseases, and some drugs. Signs and symptoms vary widely. Some patients with<unk>  may become severely ill or may have no symptoms at all. Usual symptoms include nausea, vomiting, loss of appetite, fatigue, weakness, and consciousness disorders. Blood tests of hyponatremia (sodium <135 mEq/L) and low serum osmolality (<280 mOsm/kg) may prompt the diagnosis of<unk> . Treatment depends on the causes. Adequate restriction of water intake and addition of a high concentration of sodium may get immediate improvement. Prognosis of<unk>  varies widely, depending on the cause.<unk>  secretion often presents with clinical features of low blood level of sodium (i.e., hyponatremia). It is the most common cause of hyponatremia seen in clinical practice, as hyponatremia is the most common electrolyte abnormality seen in clinical medicine.<unk>  arises when there is<unk>  secretion of the<unk><unk>  that cause the kidneys to retain free water rather than excreting it leading to fluid accumulation in the body with low blood level of sodium. The low level of sodium is due to the dilution effect of excess free body water and not a shortage; therefore, treatment of low sodium level in<unk>  is geared towards removing the excess free water and improving the level of sodium.
Syndrome of inappropriate antidiuretic hormone
Nephrogenic diabetes insipidus
Psychogenic polydipsia
Cerebral salt-wasting syndrome
Diabetic ketoacidosis
Dexamethasone sensitive hypertension
Dehydration
Familial hyperreninemic hypoaldosteronism type 2