Diarrhea, commonly known as “diarrhea”, has become a common disease in daily life due to the influence of living environment and physical condition. The causes of diarrhea are complex and are mainly divided into two categories: infectious and non-infectious factors. Infectious factors are mainly the following. One is viral infection, if the human body is infected with rotavirus, norovirus, coxsackie virus, echovirus, it will cause diarrhea, abdominal pain and diarrhea, nausea and vomiting and other symptoms. Secondly, food poisoning can also cause diarrhea, such as eating food contaminated by bacteria or their toxins, with spoiled food and contaminated water being the main sources of infection. Non-infectious factors are mainly cold attack and poor gastrointestinal function. In summer, many people like to eat cold food and drink cold drinks, or stay in air-conditioned rooms for a long time, so their bodies are easily attacked by cold and cold, resulting in gastrointestinal dysfunction and accelerated intestinal peristalsis, causing diarrhea. In addition, people with congenital or acquired gastrointestinal damage, due to insufficient gastric power, can easily cause bloating and diarrhea. The clinical causes of diarrhea are complex and need to be combined with clinical and physical examination for comprehensive diagnosis and timely treatment. It is also important to pay attention to the maintenance of the stomach and intestines to prevent the occurrence of diarrhea.