<Tr> <Th> Treatment </Th> <Td> Based on underlying cause </Td> </Tr> <Tr> <Th> Frequency </Th> <Td> Relatively common </Td> </Tr> <P> Hyponatremia is a low sodium level in the blood . It is generally defined as a sodium concentration of less than 135 mmol / L (135 mEq / L), with severe hyponatremia being below 120 mEql / L. Symptoms can be absent, mild or severe . Mild symptoms include a decreased ability to think, headaches, nausea, and poor balance . Severe symptoms include confusion, seizures, and coma . </P> <P> The causes of hyponatremia are typically classified by a person's body fluid status into low volume, normal volume, or high volume . Low volume hyponatremia can occur from diarrhea, vomiting, diuretics, and sweating . Normal volume hyponatremia is divided into cases with dilute urine and concentrated urine . Cases in which the urine is dilute include adrenal insufficiency, hypothyroidism, and drinking too much water or too much beer . Cases in which the urine is concentrated include syndrome of inappropriate antidiuretic hormone secretion (SIADH). High volume hyponatremia can occur from heart failure, liver failure, and kidney failure . Conditions that can lead to falsely low sodium measurements include high blood protein levels such as in multiple myeloma, high blood fat levels, and high blood sugar . </P>

What is considered a dangerously low sodium level