What is happening in the body prior to vomiting?

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Prior to vomiting, the body undergoes several physiological changes. The sensation often begins with an overwhelming feeling of nausea, which can be triggered by various factors such as irritation in the stomach or intestines, the presence of toxins in contaminated food, or inflammation. This irritation can stimulate the vagus nerve, leading to increased salivation and the release of gastric juices. The body prepares for expulsion by coordinating muscle contractions in the stomach and esophagus. The reference to the physiology of vomiting highlights these processes, explaining that the body reacts to perceived threats, such as harmful substances, by initiating the vomiting reflex to protect itself from further harm.
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What happens in your body prior to vomiting? By vomiting I mean after you eat something and you feel this overwhelming feeling of gas running from your stomach up into your thyroid. Is it just inflammation in the intestines that occurs that causes the food to be regurgitated or is there some acidy substance from the contaminated food that gets released into your stomach? I know this is probably a simple question, but I've always wondered what occurs inside your body prior to it happening.
 
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You may want to peruse this reference, physiology of vomiting , for some light reading that addresses your question.
 

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