Duodenal ulcer, its main symptoms include stomach pain, bloating, belching, acid reflux, nausea, vomiting, poor appetite, heartburn, and indigestion, among others. By undergoing gastroscopy, if defects are observed in the duodenal mucosa, a diagnosis of duodenal ulcer can be made. The treatment focuses on acid suppression, gastric protection, enhancing gastric motility, and protecting the gastric mucosa. Dietary considerations are crucial. Firstly, it is essential to quit smoking and alcohol. Avoid strong tea, coffee, fatty, greasy, spicy, fried, barbecued, cold foods, and sweets. Consumption of seeds such as sunflower seeds, which are high in fats, is also not recommended. These can increase gastric acid secretion and potentially worsen duodenal ulcers, hence they should be avoided.