Running on an empty stomach is not good, running on an empty stomach is prone to the risk of hypoglycemia, it is recommended to run 1~2 hours after eating, and you should choose the appropriate running mode in conjunction with your own physical condition. In the fasting state, the body lacks energy sources such as carbohydrates, cardiovascular and cerebral vessels are prone to insufficient energy supply during running, which may lead to increased risk of cardiovascular and cerebral vascular diseases, especially in patients with pre-existing heart disease or cerebrovascular disease. In addition, running on an empty stomach due to the lack of energy, the risk of hypoglycemia will increase a lot more than usual, easy to panic, fatigue and other discomforts, if the patient is suffering from diabetes, the risk of hypoglycemia will be higher. If there is any discomfort, consult a doctor in time.