Throwing up yellow is typically due to vomiting bile, which is a yellow-green digestive fluid produced by the liver that helps break down food. This often happens when vomiting occurs on an empty stomach, after all food has been expelled. However, persistent or frequent yellow vomit can indicate underlying conditions such as bile reflux, intestinal blockage, certain medication side effects, or other digestive issues. Common causes of yellow vomiting include:

• Vomiting on an empty stomach, often due to stomach flu or food poisoning.
• Bile reflux, where bile flows back into the stomach and esophagus.
• Intestinal or bowel obstruction, causing digestive fluids to back up.
• Side effects of medications that affect digestive tract muscles.
• Excessive alcohol consumption or other irritants.

If yellow vomiting is occasional and accompanied by symptoms like stomach pain, nausea, or bloating, it may need medical evaluation. Frequent or severe yellow vomiting requires prompt medical attention to rule out serious conditions such as bowel obstruction or bile reflux disease.