Childhood diarrhea is caused by various factors that increase the frequency of bowel movements in children and also change the characteristics of the stool. The common clinical manifestations of childhood diarrhea are primarily gastrointestinal symptoms. The child may experience poor appetite, spitting up milk and vomiting, and an increased frequency of bowel movements. However, the volume of stool in mild cases is not too large, appearing thin or watery, and is yellow or yellow-green in color with a sour smell. Most cases of diarrhea without dehydration or systemic poisoning recover within a few days.

In more severe cases of diarrhea, where the child experiences an increased frequency of bowel movements and the stools are watery, there can also be significant dehydration, electrolyte imbalance, and symptoms of systemic infection. These mainly manifest as either fever or lack of fever increase, irritability or lethargy and drowsiness, pale complexion, confused consciousness, and even fainting, shock symptoms.