Gastrointestinal flu is a kind of cold, which is mainly caused by a virus called “coxsackie” and is accompanied by bacterial mixed infections. The symptoms of gastrointestinal flu are: stomach distension, abdominal pain, vomiting, diarrhea, defecation many times a day, weakness, severe dehydration, electrolyte disorders, and destruction of the immune system. At this time, treatment with antidiarrheal drugs will not relieve the disease, but will delay it. The cause of gastrointestinal flu is mainly from external stimuli and other factors, and it occurs more often when the weather changes from cold to warm. This is due to the stimulation of the stomach and intestines by cold air, coupled with abnormal living habits and poor diet. The main difference between gastrointestinal colds and gastroenteritis is that patients with acute gastroenteritis often have a previous history of unclean diet, more intense nausea and vomiting, and vomit often has an irritating odor, but there are usually no fever symptoms. And many people often mistake it for acute gastroenteritis at the beginning of the onset of gastrointestinal flu. The main symptoms of gastrointestinal flu are as follows: 1. Vomiting The stomach is stimulated by the entry of vector bacteria or other toxic substances, resulting in the contraction of the stomach body muscles and the expulsion of stomach contents from the body. 2, diarrhea mainly for the gastrointestinal stimulation and secretions increased, affecting the absorption function, resulting in excessive water in the intestinal cavity, plus intestinal peristalsis also increased, so the discharge of stools are thin stools. 3, abdominal pain because the intestinal peristalsis doubled faster than normal and felt pain, or the mucous membrane on the intestinal wall due to inflammation and redness and swelling pain.