In the prone position, the return blood flow is increased, which can increase the diastolic filling of the ventricles and increase the systolic function of the heart, causing a rise in blood pressure, with the systolic pressure rising mainly, and the blood pressure is clearly increased for a short time when the standing position changes to the prone position. This is because gravity causes 300-800mL of blood to accumulate in the lower extremities when upright, resulting in a decrease in return blood flow, causing a decrease in blood volume per beat and arterial blood pressure. For middle-aged and elderly patients, it may even cause postural hypotension, leading to syncope. For patients with frequent episodes of postural hypotension, they should immediately rest in bed during the episodes, and most of them can recover quickly, while severe cases need to strengthen exercise, or even go to the hospital and take small doses of ephedrine or Chinese herbal tonic components to improve the symptoms.