1, light diarrhea, the onset can be acute or slow, the spirit is still good, mainly gastrointestinal symptoms, stool less than 10 times a day, not much volume, occasional vomiting, slightly poor appetite, no obvious dehydration and systemic toxicity symptoms. 2, heavy diarrhea, often acute onset, stool 10 times a day and more, in addition to heavy gastrointestinal symptoms, there are fever, vomiting, urine and other obvious symptoms of dehydration and electrolyte disorders and acid-base balance disorders. (3) Clinical classification of dehydration degree: (1) Mild dehydration: slightly poor spirit, slightly sunken eye sockets and fontanelle, tears, slightly dry mouth, slightly less urine, good skin elasticity, no coldness at the ends of the limbs. (2) Moderate dehydration: poor spirit, more obvious sunken eye sockets and fontanelle, less tears, more obvious dry mouth, less urine volume, poor skin elasticity, cold extremities. (3) Severe dehydration: depression, ashen face, obvious sunken eye sockets and fontanelle, no tears, obvious dry mouth, very little or no urine, very poor skin elasticity, cold extremities, and shock may occur.