Children with symptoms of diarrhea, vomiting, and dehydration are categorized into mild, moderate, and severe dehydration.

Generally speaking, with mild dehydration, there is slight dryness of the mouth, not very severe. With moderate dehydration, the dryness of the mouth becomes quite noticeable, and with severe dehydration, there is extreme dryness of the mouth.

In terms of mental state, those with mild dehydration generally feel okay, while those with moderate dehydration have poorer spirits, and those with severe dehydration appear very listless.

Regarding urination, those with mild dehydration experience a slight decrease in urine output, those with moderate dehydration have a reduced urine output, and those with severe dehydration show a significant reduction in urine output, or even no urine at all.

Another symptom to consider is skin turgor; in mild dehydration, skin elasticity is still acceptable, in moderate dehydration skin elasticity worsens, and in severe dehydration, skin elasticity is significantly impaired.

For instance, the dryness of mucous membranes, including the oral mucosa, shows slight dryness in mild dehydration, dryness in moderate dehydration, and obvious dryness in severe dehydration. Therefore, dehydration should be assessed from multiple aspects.