When you have difficulty in the stomach after eating raw garlic, you can drink more water to dilute the concentration of allicin in the intestine, and drink more milk, which not only protects the gastric mucosa, but also breaks down the allicin, if you have heartburn. If it persists without relief, you can take oral magnesium aluminum carbonate or proton pump inhibitor, etc. to inhibit gastric acid secretion, protect the gastric mucosa and promote the relief of symptoms. Eating raw garlic with an upset stomach is mainly because garlic contains an allicin, which is a very irritating ingredient. Garlic is also an alkaline substance, when eating raw garlic, the stomach acid neutralization reaction will backfire and produce heartburn, causing irritation to the gastrointestinal mucosa and causing gastrointestinal spasmodic pain. Patients are advised to give warm, light and well-digested food, avoid the intake of stimulating food such as onion, ginger, garlic, chili and pepper, eat less and more meals, avoid overeating and regular rest and rest to promote recovery.