Hidden pain in the left upper abdomen when walking after eating a full meal may be caused by improper diet, intestinal gas accumulation and gastroenteritis, which can be relieved by adjusting diet and medication. 1. Improper diet: after eating spicy and stimulating food, the patient will have some stimulation to the stomach and intestines, if you walk after eating, there will be a vague pain in the left upper abdomen, it is recommended to eat a light diet, and pay attention to rest. 2. Intestinal gas accumulation: when patients eat more gas-producing foods, such as sweet potatoes, soy products or carbonated beverages, etc., it will lead to more gas accumulation in the intestines, and there will be a vague pain in the left upper abdomen when walking. You should eat less gas-producing food, but also through exercise to enhance the function of gastrointestinal peristalsis, and you can follow the doctor’s advice to promote gastrointestinal dynamics of drugs, such as domperidone, mosapride and so on. 3. Gastroenteritis: Bacterial infection due to unhygienic diet causes gastroenteritis, and after eating food, the stimulation of inflammation will lead to symptoms of vague pain when walking. You can use antispasmodic and analgesic drugs, such as atropine and compound belladonna tablets, and anti-infective drugs, such as compound sulfamethoxazole and azithromycin, etc., under the guidance of a doctor for treatment. When the patient appears to walk after eating a full meal left upper abdomen hidden pain symptoms, it is recommended to go to the hospital in time for examination and diagnosis, and under the guidance of the doctor for treatment, do not self-medication.