Dehydration: symptoms without fixed thresholds

Severe thirst, confusion, and delirium can accompany worsening dehydration, but symptoms do not occur at identical percentage thresholds in everyone. A water loss exceeding 10% of body mass is a severe condition requiring medical care; major losses can be life-threatening. The exact “10%, 12%, and 20%” figures are not a reliable universal scale, and hallucinations are not a precise standard marker.