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→Symptoms
While dehydration can be dangerous, the danger from Hyponatremia is far greater. Hyponatremia is where the sodium (salt) levels in the blood becomes too dilute.
==Symptoms==
Initial symptoms tend to be a gain in weight and a general swelling and 'puffiness', most noticeable in the hands. More severe symptoms are caused by a swelling of the brain (cerebral edema) including nausea, vomiting, headache and malaise <ref name="ref10"/>.The link between Hyponatremia and [[Cramps]] is not clear, but there is evidence that increased sodium intake can alleviate the problem.
==Causes==
The cause of Hyponatremia is poorly understood, but commonly believed to be related to excessive water intake <ref name="ref1"/>. However, I would argue that Hyponatremia is caused excessive fluid intake in the absence of sufficient electrolytes. Hyponatremia can be common in endurance athletes: