Water intoxication

From Openwaterpedia

noun - Water intoxication, also called Hyponatremia, is the result of drinking excessive amounts of water which causes a low concentration of sodium in the blood. The early warning signs are often subtle and may be similar to dehydration and include nausea, muscle cramps, disorientation, slurred speech, and confusion. At this point, many athletes drink more water because they think they are dehydrated. Unfortunately, water alone will increase the problem of Hyponatremia. At the most extreme, an athlete may experience seizures, coma, or death.