The major problem with hyponatremia is cerebral edema. When sodium levels in the blood are very low, water goes into the brain cells and makes them swell. This causes headaches and other neurological symptoms such as confusion or memory loss. A headache on its own is easy to treat with over-the-counter pain medication. If other symptoms are present, the underlying cause could be hyponatremic. In many patients, eliminating the source of excess water is enough to treat the problem. If a medical condition, such as cancer, is the cause, its treatment will balance the sodium level.
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