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I have suffered from the same symptoms at night. I think the cramping triggers it. Occasionally after a very intense workout I will get mid night hamstring cramps that are freakishly intense, and very shortly afterward I get feelings of extreme nausea and lightheadedness, with a cold sweat. This all comes on very quickly. The last episode I had lead to a blackout. I think what happens is that the cramp alarms your nervous system and you rapidly go from a state of complete rest to a state of alarm, causing a quick spike in heart rate. Then to compensate for the elevation in heart rate (and perhaps the compression of blood vessels in the cramping leg) , your blood vessels dilate (open up) to prevent a spike in blood pressure. The dilation causes a fast drop in blood pressure, which leads to the blackout. Not a doctor but that is my body logic speaking. Anyway, your best bet is to prevent the cramps by stretching, hydrating, and getting enough electrolytes in your system.

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Q: What causes severe cramps blackouts and cold sweat and a low temp?
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