Upset stomach from eating crabs is most likely due to a history of stomach problems in the past, or from eating too much. Eating crabs upset stomach can be relieved by general treatment, domperidone, bifidobacteria, levofloxacin and other medications. 1. General treatment: patients can drink more warm water, which can promote the metabolism of food in the body. Appropriate application of hot towels for localized warm compresses. 2. medication: if due to indigestion caused by eating too much, you can apply domperidone tablets, compound digestive enzymes, bifidobacterium triplex capsules and other drugs under the guidance of the doctor to treat; if due to acute gastroenteritis caused by eating crabs, you can apply levofloxacin capsules and other antibacterial drugs under the guidance of the doctor to treat. Crab is a cold food, daily eating crab should be moderate. After eating crabs, patients need to go to the hospital to see a doctor, the doctor according to the condition of the treatment, do not unauthorized use of medication.