What should I do if I haven't eaten for a long time and feel nauseous whenever I try to eat?

Feeling nauseous or wanting to vomit immediately after eating due to prolonged fasting can be addressed by identifying and treating the underlying cause. Common causes include dietary irritation, indigestion, gastritis, insufficient gastric motility, and gastric ulcers.

1. Dietary Irritation

Prolonged fasting puts the body in a state of hunger. Consuming foods with strong odors—such as durian or stinky tofu—can trigger physiological nausea and vomiting. This sensation of wanting to vomit upon eating typically subsides once consumption of such foods is stopped.

2. Indigestion

When gastrointestinal digestive function is impaired, food cannot be effectively digested and absorbed, remaining in the digestive tract for extended periods. This may lead to stomach fullness or reflexive vomiting, causing nausea upon eating, possibly accompanied by bloating. Follow medical advice to take medications such as multienzyme tablets, enteric-coated pancreatin tablets, or compound pancreatin tablets for treatment.

3. Gastritis

Inflammation can disrupt normal gastric acid secretion (either excessive or insufficient), impairing digestion. Eating after prolonged hunger may irritate the gastric mucosa, leading to nausea, vomiting, or loss of appetite. Under medical guidance, anti-inflammatory medications such as enteric-coated aspirin tablets, enteric-coated erythromycin tablets, or clarithromycin tablets may be used.

4. Insufficient Gastric Motility

When stomach muscles fail to effectively move food into the small intestine, food stagnates in the stomach. Eating when hungry may worsen this discomfort, triggering nausea and vomiting, often accompanied by post-meal fullness. As directed by a physician, prokinetic agents such as domperidone tablets, mosapride citrate tablets, or itopride hydrochloride tablets may be prescribed to enhance gastrointestinal motility.

5. Gastric Ulcer

Damage or ulcers in the gastric mucosa can be irritated by food intake during hunger, resulting in nausea and vomiting, possibly accompanied by burning pain in the stomach. Under medical supervision, treatment may include proton pump inhibitors such as omeprazole enteric-coated capsules, lansoprazole enteric-coated tablets, or rabeprazole sodium enteric-coated tablets.

If symptoms persist without improvement, seek timely medical evaluation and follow prescribed treatments. Maintain regular eating habits and avoid spicy or irritating foods to prevent gastrointestinal discomfort.