Under normal circumstances, most people will not be poisoned after eating crabs, except for a very small number of people who are allergic to crabs. Crab poisoning can sometimes occur when eating crabs, mainly due to spoilage or bacterial contamination of crabs. After eating crabs, patients will show the following symptoms: 1, patients will show nausea, vomiting, abdominal pain, diarrhea, poor appetite and other gastrointestinal reactions, which should be sent to the hospital for treatment immediately. Because, if the crab will contain toxins after corruption and deterioration will damage the human body, in the rescue treatment can be through gastric lavage, diarrhea, and infusion, nutritional support and other treatments have a certain effect.2, if eaten by the bacterial contamination of crabs, will cause bacterial food poisoning, bacterial food poisoning patients will have a high fever, convulsions, and septicemia, which is often life-threatening and should be immediately rescued.