Running on an empty stomach in the morning is not recommended for stomach acid. For those who have too much stomach acid secretion, running on an empty stomach is likely to cause acid reflux and discomfort, and may even increase the probability of suffering from reflux esophagitis and other diseases. Moreover, running on an empty stomach will enhance gastrointestinal peristalsis, causing excessive secretion of gastric acid and aggravating the discomfort. Therefore, for safety reasons, it is not recommended to run on an empty stomach in the morning for patients suffering from stomach acid. For those who have excessive secretion of stomach acid, you can eat some soda crackers and other alkaline foods in the morning to neutralize the stomach acid and the discomfort symptoms. After eating, it is recommended to run one hour after the meal, but when running, you should pay more attention, not too strenuous.