Whether diarrhea after vaccination is normal or not needs to be analyzed according to the severity and duration of symptoms and whether it can recover on its own. Usually, diarrhea is a normal drug reaction after vaccination and no special treatment is needed, but the possibility of pathological factors cannot be completely excluded. Some people may have normal drug reactions such as stomach pain and diarrhea after vaccination, but the symptoms are usually mild and can be cured by themselves without drug intervention. Take care to get more rest and eat light, easily digestible and absorbable food, such as egg custard and millet porridge. If the diarrhea is frequent and becomes more severe, it may be caused by pathological factors, and the cause of diarrhea, such as intestinal infections, tumors or polyps, should be clarified at the hospital in time. Take medication to regulate intestinal flora and anti-infection under the guidance of the doctor, and also rehydrate promptly to prevent dehydration. Usually, after vaccination, the patient should be observed in the observation room for 30 minutes. After 30 minutes, if there are no uncomfortable symptoms such as dizziness, vomiting or fever, the patient can leave the observation room.