If you have regurgitation and vomiting after eating crabs, you need to pay attention to the presence of diarrhea. If you have a crab, vomiting, diarrhea and fever, you should consider it as a sign of acute gastroenteritis. It is recommended that you improve your blood tests, and if you have elevated white blood cells, you should take further anti-infection treatment. In addition, pay attention to the number of diarrhea, if the number of abdomen is more, timely rehydration treatment to prevent the performance of dehydration. You can add montelukast, anti-diarrheal treatment, rectify the intestinal flora, and then carry out further treatment. At the same time, the diet should be light, avoid acid, spicy, stimulating food, you can drink some rice soup, so that the gastrointestinal tract fully rest.