If you experience diarrhea from eating crabs, it is recommended to go to the hospital in time, because there are more reasons for this situation, which may be the manifestation of food poisoning, crab allergy, or the symptoms of sudden acute gastroenteritis or gastric ulcer, and you need to clarify the specific cause of the disease, and then take the appropriate medication. Causes and treatment 1, food poisoning: food poisoning may occur after consuming large amounts of crabs, manifested as vomiting acid, vomiting, diarrhea and other symptoms. The toxin can be promoted by drinking appropriate amount of water and using laxative. 2. Crab allergy: Dead crabs produce a large amount of histamine, which can cause severe allergic reactions after consumption, manifested as rash, itching, abdominal pain and diarrhea. It is necessary to take paracetamol, loratadine or diphenhydramine orally under the guidance of a doctor to combat allergies, and to replenish sufficient water, and in severe cases, glucocorticoid therapy such as cortisone and methylprednisolone can also be considered. 3. Those with severe diarrhea and vomiting should be given fluids to replenish blood volume, such as infusion of glucose, balanced salt solution, etc. Caution crabs, fish and shrimp and other seafood contain bacteria, mainly paramagnetic solitary bacteria, heat-resistant, not easy to kill, must be cooked before consumption, at least 5 minutes of hot cooking.