The stomach has a vague pain every afternoon, which is mainly considered to be related to dietary influences, environmental changes and digestive system diseases. 1. Dietary influences: overeating at lunchtime or consuming spicy and stimulating food for a long time can stimulate the gastric mucosa, leading to the symptoms of vague pain in the stomach. 2. Environmental factors: environmental changes are also the main cause of stomach pain, such as from the normal environment into a cold environment, abdominal cell phone, can also trigger a vague pain in the stomach. 3. Digestive system diseases: such as chronic gastritis, gastric ulcer, gastric cancer and other diseases, can also lead to patients with vague pain in the stomach symptoms. The causes of this symptom are complex and varied. It is recommended that patients seek medical examination as soon as possible, and take targeted treatment under the guidance of the doctor.