In a recent issue of the Journal of Internal Medicine, the investigators reported cases of brain edema caused by "water poisoning" in some marathon runners. They all drink too much water in the game, causing a drop in sodium in the blood. According to medical experts, if the blood absorbs too much water, it will form a fluid in the brain. Finally, the lungs will accumulate water, causing the athlete to have difficulty breathing or want to vomit.

 It is still unclear whether athletes outside the marathon have similar experience, but this is possible. The professor said further: "The natural reaction to these symptoms is to drink a lot of water. Although not drinking enough water can cause problems, drinking too much water can also cause problems."

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