Eat crayfish after stomach pain may be due to gastritis, gastric ulcer and other lesions caused by the symptoms. 1. gastritis: such people can appear indigestion, gastrointestinal peristalsis slowdown, stomach pain, bloating, nausea and vomiting and other symptoms, and eating crayfish may aggravate the phenomenon of stomach pain, such people can take omeprazole acid-suppressing drugs for treatment. 2. gastric ulcer: such people due to gastric mucosal lesions itself can have symptoms of gastric pain, in addition, there can be gastric distension, nausea and vomiting and other phenomena, eating lobster may stimulate the gastric mucosal damage resulting in further aggravation of the phenomenon of gastric pain, you can take omeprazole acid suppression drugs for treatment, if necessary, you can take bismuth potassium citrate gastric mucosal protection drug treatment. Eat crayfish stomach pain after a number of reasons, but also does not exclude pancreatitis, etc., it is recommended to consult a doctor in a timely manner, the drug needs to be applied under the advice of a doctor.