After eating crab poisoning, patients often have the first manifestation of symptoms in the digestive tract, such as nausea, vomiting, abdominal pain, diarrhea, loss of appetite, and mucus and blood stools. In severe cases, patients with more diarrhea or severe vomiting may also suffer from dehydration. After crab poisoning, some patients may also experience neurological manifestations, such as dizziness, headache, weakness, and even numbness and convulsions of the hands and feet. In conclusion, it is important to pay high attention to crab poisoning and seek treatment at a regular hospital as soon as possible. Some patients have mild symptoms of poisoning, while a few patients have more serious symptoms of crab poisoning, even breathing difficulties and shock, and must be treated as soon as possible.