Stomach discomfort after eating too much crab may be caused by infection, indigestion or allergy, patients should go to the hospital in time, and the treatment includes medication. 1. Infection: If the crabs are not processed properly, and the germs or parasites in the crabs are not removed, eating too many crabs may lead to infection, and the patient will experience stomach discomfort, abdominal pain, bloating, nausea and other symptoms. Patients can follow the doctor’s instructions to use medication, drugs include penicillin, erythromycin, ceftriaxone, cefotaxime, metronidazole and so on. 2. Indigestion: Eating too much crab may lead to indigestion, and patients may experience stomach discomfort, regurgitation, nausea, heartburn, vomiting, diarrhea and other symptoms. Patients can follow the doctor’s advice to use medication, drugs include domperidone, mosapride, etc. 3. Allergy: If the patient is allergic to crab, eating too much crab may lead to allergy, and the patient will have stomach discomfort, diarrhea, rash, maculopapular rash, breathing difficulties and other symptoms. Patients can use medication as prescribed by their doctor, which includes loratadine tablets and cetirizine hydrochloride tablets. Patients should follow the doctor’s instructions for treatment, do not blindly treat yourself, so as not to delay the condition.