Violent vomiting after eating seafood may be caused by allergic factors, or bacterial infection leading to acute gastroenteritis, or food poisoning, etc., and you should consult a doctor in time to find out the cause. 1. Allergy: some people may be allergic to seafood, and after consuming seafood, an over-immune reaction can occur, causing gastrointestinal allergic reactions, resulting in nausea, vomiting, diarrhea and other digestive allergy symptoms. 2. Acute gastroenteritis: If patients eat unclean seafood contaminated by viruses, bacteria or bacterial toxins, it can lead to acute gastroenteritis, resulting in severe vomiting, accompanied by abdominal pain, diarrhea, varying degrees of fever, chills, and in severe cases, it can also lead to dehydration and electrolyte disorders. 3. food poisoning: after eating seafood, severe vomiting may also be due to eating toxic food, or food contaminated by bacteria, bacterial metabolites and toxic reactions. The patient’s vomit is mostly eaten food, but can also contain bile, mucus, blood, accompanied by abdominal pain, diarrhea, and may even have dizziness, blurred consciousness, muscle twitching and other symptoms. Severe vomiting after eating seafood, the patient should promptly go to the emergency department of the hospital, a clear diagnosis, and the doctor to give targeted treatment.