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If vomit is yellow it is either because of something you just ate that is yellow or its bile. Just on the other side of your lower stomach sphincter there is a bile duct that's by your liver. Its in your duodemdum ( i think that's how you spell it) or small intestine... and when you vomit yellow and you havent eaten something that's yellow its basically the bile coming back up through the lower stomach sphincter from the duodendum (small intestine) and into your stomach... yea its gross... but that's what it is

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14y ago

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