The reaction of diarrhea after vaccination with the new crown vaccine is mostly transient, consistent with what happens after other vaccinations, and generally does not require special treatment, but it cannot be excluded that it is caused by other gastrointestinal problems that occur during this period. Generally, after vaccination, there may be mild reactions, such as redness and swelling at the vaccination site, hard lumps, low fever, fatigue, headache, muscle pain, etc. Very few people may have adverse reactions such as diarrhea, but the symptoms are usually mild and normal. At this time, it is recommended to ensure a light diet, you can eat millet porridge, noodle soup and other easily digestible food to avoid stimulating the gastrointestinal mucosa again, while paying attention to abdominal warmth and maintaining a good state of mind, usually 2-3 days later will gradually recover on its own. If the diarrhea is serious, the number of stools even reaches dozens of times a day, watery stools, accompanied by abdominal pain or vomiting symptoms, you can take montelukast, diphenoxylate and other drugs to stop diarrhea under the guidance of a doctor, and pay attention to replenish water to avoid electrolyte disorders caused by diarrhea. If necessary, go to the hospital for a clear diagnosis to determine whether the diarrhea is caused by bacterial or viral infections, and take levofloxacin or metronidazole or cephalosporin antibiotics under the guidance of a doctor to relieve the symptoms of diarrhea.