Stomach bloating, nausea, vomiting and diarrhea may be caused by acute gastroenteritis, indigestion and gastrointestinal cold. 1. Acute gastroenteritis: eating spoiled, rotten and other unclean food, resulting in viral, bacterial, parasitic infections, mainly manifested in stomach bloating, nausea and vomiting, diarrhea, fever and other symptoms. 2. Indigestion: Eating spicy stimulation, fat, sweet, thick and greasy, raw and cold food, leading to gastrointestinal dysfunction, resulting in indigestion, stomach bloating, nausea and vomiting, diarrhea and other symptoms. 3. Gastrointestinal colds: mainly caused by viral infections, manifested as stomach bloating, nausea and vomiting, diarrhea, which can be accompanied by fever, headache, nasal congestion, runny nose and other symptoms. If the symptoms of bloating, nausea, vomiting and diarrhea occur, consult a clinician and follow medical advice.