What causes low sodium in the blood?


Quick Answer

Low sodium in the blood, or hyponatremia, has several possible causes, including certain medications, syndrome of inappropriate anti-diuretic hormone, hormonal changes and heart, kidney or liver conditions. Other sources of low sodium are overconsumption of water, dehydration, use of ecstasy and chronic vomiting or diarrhea, states Mayo Clinic.

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Full Answer

Drugs that cause users to sweat or urinate more frequently sometimes lead to hyponatremia, according to Mayo Clinic. These include diuretics — also known as water pills — antidepressants and pain medications.

Syndrome of inappropriate anti-diuretic hormone most often occurs in people with heart failure or brain injuries, and the body produces too much antidiuretic hormone, the University of Rochester Medical Center explains.

If thyroid or adrenal glands do not make sufficient hormones, hyponatremia sometimes develops, states Mayo Clinic. Certain diseases, such as congestive heart failure, influence blood sodium levels. In addition, hyponatremia occurs when too much liquid is consumed or too much body fluid is lost.

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