Diarrhea refers to an acute medical disease characterized by a sudden onset of bowel movements and an urgent need to defecate. In modern medicine, acute enteritis, acute food poisoning, and acute diarrhea caused by certain intestinal allergies all fall into this category. Acute enteritis patients often develop the disease suddenly in summer and autumn, and often have a history of eating unclean food by mistake. It is characterized by an explosive epidemic. Patients often show nausea and vomiting first, followed by diarrhea, 3 to 5 times a day, or even dozens of times a day. The stool is watery, dark yellow or green, and has a foul odor. It may be accompanied by abdominal cramps, fever, body aches, and other symptoms.