Children’s tummy ache from eating bad food is due to inflammation of the gastrointestinal tract triggered by unclean food, viral or bacterial infection. There is no treatment for quick relief as each child is different individually. It is recommended to go to the hospital, under the guidance of the doctor for medication, general dietary treatment and so on. 1. Medication: According to the child’s own condition, medicines to protect the gastric mucosa (e.g., omeprazole, etc.) and improve the intestinal flora (e.g., Lactobacillus acidophilus, etc.) can be taken under the guidance of the doctor. If the infection and fever are caused by bacteria, antibiotics (e.g. norfloxacin, etc.) and antipyretics (e.g. ibuprofen suspension, etc.) can be taken according to medical advice. 2. General dietary treatment: If acute gastrointestinal inflammation is caused by bacteria or viruses, intravenous dextrose can be given to prevent dehydration when diarrhea and vomiting are severe at the beginning. When vomiting and diarrhea are relieved in the later stages, light and easy-to-digest food such as porridge can be eaten. Children with severe abdominal pain, diarrhea or high fever should go to the hospital immediately to avoid missing the best treatment time and aggravating the condition.