Overhydration can happen for a few other reasons as well:

Overhydration during intense exercise

Like water poisoning during military training, overhydration during intense heat or exercise can lead to a fall in sodium reserves in your body.

The combination of heavy sweating combined with drinking just water, rather than a drink that replenishes lost electrolytes, can lead to water intoxication.

Heat-related Overhydration

When temperatures rise, we sweat to cool our bodies off. You also lose more fluids when you sweat, which increases thirst.

Thirst leads to drinking water. But with the heat crossing 40 degrees celsius, the urge to constantly drink water is overwhelming. But after a certain point, you’ve lost so many electrolytes and fluids through the sweating that drinking more water is actually diluting your electrolytes even further.

This can lead to headaches, irritability, confusion, and in some cases, water poisoning.

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Originally Appeared Here