Hello, diarrhea is generally divided into chronic diarrhea and acute diarrhea. If the course of the disease is within 3 weeks, it's call acute diarrhea, if the course of disease is more than three weeks, it is called chronic diarrhea. Acute diarrhea is mostly caused by bacterial or bacterial toxins. In autumn and summer, it is easy to infect rotavirus and cause autumn diarrhea. If you do not pay attention to hygiene or eat uncooked food, it may cause acute diarrhea due to ingestion of parasites. Certain systemic diseases, heavy metal poisoning, adverse drug reactions, etc. may also cause acute diarrhea. The cause of chronic diarrhea is more complicated, infection, intestinal tumors, irritable bowel syndrome, etc. can lead to chronic diarrhea. When did he start diarrhea? Does diarrhea occur after a meal? Have you ever paid attention to his excrement and whether the excrement has a shape? It is recommended to reduce the intake of greasy diet and minimize the intake of cold drinks. Further diagnosis requires a fecal panel, blood panel and colonoscopy.