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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. For more details see [[The Science Of Hydration]] and [[Practical Hydration]].
==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|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 both problems.
==Causes==
