There are two major factors that cause diarrhea in children: non-infectious and infectious factors. Diarrhea is a group of common pediatric conditions caused by multiple pathogens and factors, characterized by an increase in the number of stools and changes in stool properties. There are two major factors that cause diarrhea in children: non-infectious and infectious factors. Non-infectious factors are relatively simple, such as diarrhea caused by drinking cold water, eating cold food, or intolerance to certain foods, such as allergies or food poisoning, etc. This type of diarrhea does not show special manifestations on stool examination; infectious factors are relatively complex, such as bacterial enteritis, in which red blood cells, white blood cells or pus cells can be detected in the stool, while viral enteritis may detect special viruses, such as rotavirus etc. When a child has diarrhea, it is best for parents to send their child’s stool to the hospital for examination, which is more conducive to finding the cause of the diarrhea and treating it symptomatically. However, the following two points must be noted when taking stool specimens: 1. Stools should always be stored in plastic bottles or plastic wrap, never in diapers, because it is difficult to detect abnormalities in the stool after the water in the stool is absorbed by the diapers; 2. Stools should be sent to the hospital for examination within 1 to 2 hours, otherwise false results are likely to occur.