Flu In Children Vomiting. Vomiting occurs when the flow is forceful — shooting out inches rather than dribbling from the mouth. The most common cause of nausea and vomiting is viral gastroenteritis, often called the stomach flu.
Severe vomiting may lead to dehydration, which may need medical attention. *it’s important to note that not everyone with flu will have a fever. This causes rapid vomiting within hours after eating the bad food.