I vomitted a yellow substance. What is it?

There are several potential causes for vomiting yellow substance, each with its own underlying medical conditions. Here are a few possible explanations:

* Bile: Bile is a yellowish-green fluid produced in the liver and stored in the gallbladder. It helps in digesting fats. Vomiting bile can be a sign of various conditions, including:

* Gastroesophageal reflux disease (GERD): In GERD, stomach contents, including bile, flow back into the esophagus, causing irritation and inflammation. Acid reflux, heartburn, and nausea are common symptoms of GERD.

* Biliary tract diseases: Conditions affecting the biliary tract, such as gallstones, cholecystitis (gallbladder inflammation), or pancreatitis (pancreas inflammation), can lead to bile vomiting.

* Liver disease: Various liver disorders, such as hepatitis, cirrhosis, or fatty liver disease, can disrupt bile production and cause vomiting.

* Stomach or intestinal disorders: Some stomach or intestinal problems, such as gastroenteritis (stomach flu), food poisoning, or certain types of infections, can cause vomiting of yellowish fluid due to irritation and inflammation of the digestive system.

* Medication side effects: Certain medications, such as antibiotics, chemotherapy drugs, or non-steroidal anti-inflammatory drugs (NSAIDs), can have a side effect of causing nausea and vomiting, which may lead to yellow substance vomiting.

* Other medical conditions: In rare cases, yellow substance vomiting can be a symptom of more serious medical conditions, such as intestinal obstruction, bowel perforation, or certain types of cancer.

It's essential to seek medical attention if you experience vomiting yellow substance, particularly if it persists, is accompanied by other symptoms (e.g., fever, abdominal pain, changes in bowel movements), or if you have any underlying medical conditions. A healthcare professional can evaluate your symptoms and determine the appropriate diagnosis and treatment.