While extremely rare, this condition has caused death during or after running long runs or marathons. Many runners become overly concerned about hyponatremia, and don’t drink enough before during and after a long run. The result is dehydration, which is much more likely to cause medical problems, and increase recovery time after long runs. As in all training components, each runner must assume responsibility for their hydration and health, and use good common sense. For more information, read the Hyponatremia Article (pdf) on Jeff's website.