Is serious: In the case of your dad, perhaps intravenous fluid was given to correct the dehydration. If too much water is given without salt ( sodium), then the sodium in the body gets diluted and it is called hyponatremia. Mild condition will correct itself. However very low sodium in the body causes swelling of the brain, which manifests itself in drowsiness, headache, it is easily corrected by giving salt.
Answered 9/2/2013
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