Nausea and vomiting after eating expired food may be due to food spoilage resulting in damage to the gastric mucosa, inducing acute gastroenteritis attacks and food poisoning symptoms. The methods that can be used include inducing vomiting, taking acid-suppressing drugs and antibiotic drugs, etc., and gastric lavage may be needed in serious cases. 1. Emetic: It can stimulate the throat to spit out the expired food and prevent further damage to the stomach and intestines from expired food. 2. Medication: If you still feel sick after vomiting, it may have caused acute gastroenteritis. In this case, you can use amoxicillin, cephalosporin and other antibiotics to play the role of sterilization. And can be combined with omeprazole, lansoprazole and other proton pump inhibitors, inhibit gastric acid secretion, to avoid further stimulation of the damaged gastrointestinal tract. 3. Gastric lavage: If the patient combines diarrhea, abdominal pain, fever, dizziness, dehydration, shock and other symptoms, it may be bacteria or toxins attacking the body, causing food poisoning. In this case, saline can be used to wash the patient’s stomach to remove the poison from the body. If any discomfort occurs after taking expired food, it is recommended to go to the hospital in time for treatment with the help of a doctor.