Seafood such as crabs, fish and shrimp, shellfish and other aquatic products are rich in nutrition and delicious, these marine aquatic products may carry their own toxins, pathogenic bacteria, contaminated during transportation or fishing or improperly caused by contamination in the cooking process, the toxins are not destroyed by high temperature, may also cause symptoms of poisoning. The main manifestations are gastrointestinal discomfort, such as dizziness, nausea, vomiting, abnormal sensation or with symptoms of nerve paralysis, which can seriously lead to impaired consciousness and even shock. There are also patients who are allergic to seafood and experience generalized itching, hives, dyspnea, dizziness, headache, and in the most severe cases, anaphylactic shock, so beware when eating seafood.