Common diseases that cause sudden diarrhea include acute gastroenteritis or food poisoning, which can be treated with rehydration, medication such as levofloxacin, or treatment such as inducing vomiting and gastric lavage. 1. Acute gastroenteritis: Most of the diarrhea is caused by bacterial or viral infection, which can be accompanied by abdominal pain, nausea, vomiting and other symptoms. It can be treated with drugs such as levofloxacin, norfloxacin, ribavirin, etc., and attention should be paid to fluid rehydration to prevent electrolyte disorders. Severe diarrhea can use montelukast and other intestinal mucosal protective agents to stop diarrhea. 2. Food poisoning: If you enter moldy and spoiled food or toxic food such as sprouted potatoes and so on, nausea, vomiting, diarrhea, abdominal pain and other situations may occur. At this time, it is necessary to induce vomiting or gastric lavage and other methods to promote the rapid discharge of toxins, and with rehydration to stop diarrhea and other therapeutic means. When sudden diarrhea occurs, it is recommended to consult a doctor as soon as possible for examination and symptomatic medication. Do not use antidiarrheal drugs on your own.