Abdominal pain after eating crayfish, may be related to acute gastroenteritis, allergies, food poisoning and other causes. 1. Acute gastroenteritis: If you eat crayfish are not cleanly handled, can cause acute intestinal spasms, abdominal pain, diarrhea and other symptoms. 2. Allergy: seafood allergy after eating crayfish, may cause the body abnormal immune response, abdominal pain, vomiting and other symptoms. 3. Food poisoning: If the eating crayfish contaminated with bacteria, bacterial metabolites or other toxins, can lead to nausea, vomiting, abdominal pain and other symptoms. Recommended to eat crayfish after abdominal pain in a timely manner to the hospital, clear cause, under the guidance of the doctor for standardized treatment to avoid delays.