Stomach pain at three or four o’clock in the afternoon every day is considered to be related to the pain caused during the digestion of food after lunch, which is common in patients with gastric ulcer and duodenal ulcer.1. Gastric ulcer: The painful site of typical gastric ulcer is to the left of the subxiphoid process, which occurs 0.5-2 hours after meals. After lunch diet stimulates gastric acid secretion, and when digestion is almost over, gastric acid stimulates the ulcer surface and triggers painful sensations. If the lunch time is fixed at about one o’clock, stomach pain will appear at three or four o’clock in the afternoon, and patients can also have symptoms such as bloating and diarrhea. 2. duodenal ulcer: ulcers occur in the duodenum, often manifesting as hunger pain, and the pain is located in the upper middle abdomen to the right. if you have not eaten or eaten less at noon, you If you have not eaten at noon or eaten less, you will have stomach pain 3-4 hours after lunch, accompanied by belching, acid reflux and other symptoms, which can usually be relieved after eating again. Gastric ulcers, duodenal ulcers and other peptic ulcers are usually diagnosed by gastric fluid analysis, gastroscopy and other test results. They are often treated with gastric acid inhibiting secretion drugs to protect the mucosa, such as omeprazole, cimetidine, rabeprazole, etc. Patients need to actively adjust their dietary habits. They can eat less and more meals, avoid over-filling and over-starving, and should not eat again 2 hours before bedtime to avoid aggravation; their daily diet should be based on fine foods that are easy to digest, such as thin rice and noodles, and avoid greasy, cold and stimulating foods, such as fried chicken and ice cream, etc.