Childhood diarrhea is caused by a variety of pathogens and factors, characterized primarily by diarrhea. Key features include increased stool frequency and changes in stool characteristics, possibly accompanied by fever, vomiting, abdominal pain, and varying degrees of electrolyte and acid-base imbalances. The pathogens involved can be viruses, bacteria, parasites, fungi, etc. Additionally, factors like the misuse of antibiotics leading to intestinal flora imbalance, improper feeding, and getting chilled can also cause it. Symptoms can vary from mild to severe diarrhea. Generally, mild diarrhea primarily involves gastrointestinal symptoms and may accompany vomiting or poor appetite, with increased stool frequency and changes in stool characteristics, but no significant dehydration or systemic acidosis, usually recovering within a few days. Severe diarrhea is often an acute condition that can develop from mild diarrhea, presenting more severe gastrointestinal symptoms as well as noticeable dehydration, electrolyte imbalances, and systemic toxicity symptoms such as fever, lethargy, drowsiness, and shock.