Bilious Vomiting: Understanding the Causes and Knowing How to Respond

We refer to bilious vomiting when the contents expelled by the stomach contain bile, a greenish to yellowish liquid produced by the liver and stored in the gallbladder. Its main function is to aid in the digestion of fats, but it can sometimes flow back into the stomach and be expelled during vomiting.

This type of vomiting differs from "classic" vomiting in its coloured appearance and characteristic bitter taste. It is not a disease in itself but a symptom, indicating an imbalance or irritation of the digestive system.

The presence of bile can have benign causes (such as a stomach that has been empty for too long) or more serious ones (intestinal obstruction, bile reflux, etc.). This is why it is important not to ignore it, especially if episodes recur or are accompanied by other symptoms.

Bile-stained vomit can have several causes. Some are benign, while others require medical attention. Here are the most common causes:

Reflux or digestive obstruction

Bile is normally directed to the duodenum to aid in the digestion of fats. However, sometimes the pyloric sphincter—the valve between the stomach and the intestine—allows this bile to flow back into the stomach. This reflux irritates the stomach lining and can trigger greenish-coloured vomiting.

In more severe situations, such as an intestinal obstruction, the passage is blocked. Food stagnates, pressure builds up, and the body attempts to relieve itself by causing repeated vomiting, during which bile eventually appears.

Empty stomach

Even when empty, the stomach continues to perform rhythmic contractions that normally serve to clear out the last bits of food and prepare the digestive tract for the next meal. But if no food is present, these contractions can push gastric fluid and cause bile to rise from the duodenum back into the stomach.

Bile is supposed to remain in the small intestine, where it aids in the digestion of fats. When the digestive tract is empty and contractions continue, bile reflux can occur, causing vomit that appears greenish or yellowish.

This is why bilious vomiting often occurs on an empty stomach, upon waking, or after prolonged fasting: the body then expels what remains, that is, bile alone.

Food poisoning or a digestive infection

During food poisoning or a viral/bacterial infection, the body seeks to quickly eliminate the pathogens. It then triggers a series of reflexive vomiting episodes. As the stomach empties, the only thing left to expel is bile.

Irritation of the stomach lining by toxins or germs intensifies this mechanism: the stomach contracts repeatedly, forcing bile to rise up during vomiting. This is a defensive reaction by the body that may be accompanied by other symptoms and requires medical attention.

Post-operative or medication-related

After certain abdominal surgeries (gastrectomy, bariatric surgery, etc.), coordination between the stomach, the pylorus, and the duodenum can be disrupted. As a result, bile flows abnormally and refluxes more easily into the stomach, leading to bilious vomiting.

Certain medications can have the same effect. They alter bile flow or secretion, making the stomach more susceptible to bile reflux and, consequently, to this type of vomiting.

Bile-stained vomit does not always occur on its own. It is frequently accompanied by other symptoms that can help identify its cause.

• Abdominal pain: This often indicates irritation of the digestive tract lining or an excessive and painful contraction of the stomach and intestines.

• Persistent nausea: Bile is not meant to travel in the opposite direction. Normally intended for the small intestine, it becomes irritating when it flows back into the stomach, which perpetuates the feeling of discomfort and the urge to vomit.

• Fatigue and dehydration: Repeated loss of digestive fluids quickly leads to a loss of water, minerals, and energy.

• Fever, diarrhoea, or bloating: These symptoms are more common in cases of gastrointestinal infection or food poisoning and can guide the medical diagnosis.

Even if these symptoms seem minor, their combination with vomiting bile should always be cause for concern, especially if they persist or worsen.

When faced with bilious vomiting, the first reaction should be vigilance. Even if it is an isolated episode, this symptom should never be taken lightly.

• Consult a healthcare professional: This is the essential recommendation. Only a doctor can identify the specific cause and recommend appropriate treatment.

• Recognise warning signs: Repeated vomiting, the presence of blood, severe abdominal pain, or a high fever require prompt, even urgent, medical attention.

• While waiting for your appointment: Stay well-hydrated by taking small sips of water, avoid heavy or fatty foods, and opt for light, frequent meals. These steps, while waiting to see a doctor, can help minimise discomfort.

Certain simple habits, combined with appropriate supplements, can support the digestive system and reduce the occurrence of bilious vomiting.

1. Eat a balanced and regular diet: Excess fat, alcohol, or overly large meals put a heavy strain on the gallbladder and promote bile reflux. Conversely, eating smaller, more frequent meals at set times limits periods of prolonged fasting, which are often the cause of morning bilious vomiting.

2. Stay well-hydrated with appropriate beverages: Vomiting leads to rapid loss of water and minerals. To deeply rehydrate the body, consider powdered electrolytes, which offer a practical solution: they provide sodium, potassium, and magnesium, essential for maintaining fluid balance and aiding recovery.

3. Soothe the digestive system with herbs: Certain herbal teas help calm digestive spasms and feelings of discomfort. Our organic mint digestive herbal tea is particularly beneficial: peppermint supports normal digestive function and helps soothe sensitive stomachs.

4. Supporting the gastric mucosa with minerals: When bilious vomiting is linked to acid reflux, it is helpful to strengthen the stomach and digestion with certain minerals. Zinc contributes to normal acid-base metabolism. Magnesium, meanwhile, helps reduce fatigue and supports the normal functioning of the nervous system, which is often involved in digestive hyperreactivity. With its optimal bioavailability, Magnesium Triple easily fits into a routine to enhance digestive and nervous system comfort.

5. Maintaining a healthy lifestyle: Regular sleep, gentle physical activity, and stress management contribute to better digestive balance. Chronic stress stimulates acid production and increases the risk of bile reflux.

Bile-stained vomit is not a disease, but a medical symptom. It should never be taken lightly or treated with self-medication. In cases of recurrence, severe pain, fever, or any unusual signs, it is essential to consult a doctor to obtain an accurate diagnosis and appropriate follow-up care.

Ginger is a well-known ally for reducing nausea and supporting digestion. In cases of bilious vomiting linked to acid reflux, it can be combined with licorice (unless you have high blood pressure), which helps soothe the stomach lining. If stress is the cause, combine it with lemon balm, as it promotes relaxation and digestive comfort. Finally, consider chewing a few fresh basil leaves to help calm episodes of vomiting.

Eloïse is a certified ‘naturopathic practitioner’ by the Institut Supérieur de Naturopathie (ISUPNAT) and has been practising naturopathy for over 5 years. Thanks to her extensive experience working in various herbalist shops, Éloïse provides, where necessary, comprehensive and precise advice on phytotherapy, aromatherapy, gemmotherapy and micronutrition when drawing up a personalised lifestyle programme tailored to each individual.