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→Causes
==Causes==
The cause of Hyponatremia is poorly understood, but there appear to be two several likely causes in runners.
# Excessive water intake can cause 'dilutional Hyponatremia'<ref name="ref1"/>. Healthy kidneys can excrete about 2 pints (1 liter) of fluid per hour, but this may be reduced by exertion or illness <ref name="ref3"/>. So drinking >6 pints in 4 hours could easily exceed the kidneys capacity to cope. The recent rise in Hyponatremia may be due to earlier advice to athletes to "drink as much as possible" <ref name="ref13"/>, combined with a general concern about salt intake.
# For ultrarunners[[Sodium Deficiency]], I would argue combined with adequate or excessive hydration.# [[NSAIDs and Running|NSAID]] usage, which is been linked to hyponatremia.# [http://en.wikipedia.org/wiki/Syndrome_of_inappropriate_antidiuretic_hormone_hypersecretion Syndrome Of Inappropriate Antidiuretic Hormone Hypersecretion], or SIADH, is where the body secretes too much of the hormone (vasopressin) that Hyponatremia reduces the urine output of the kidney.it's not clear if this is an independent cause of hyponatremia, or if this is more likely to be caused by a insufficient electrolytes combined with appropriate drinkingmechanism underlying one of the other causes.
==Likelyhood==
Hyponatremia can be common in endurance athletes:
