The causes of postprandial hypotension are increased visceral blood flow and delayed pressure reflex.
1. Increased visceral blood flow. After eating, the vagus nerve is excited and produces some active peptides with vasodilatory effects, resulting in significant dilation of visceral blood vessels and a consequent increase in visceral blood flow, which is conducive to the digestion and absorption of food. Visceral blood flow increases, and blood flow to other parts of the body, such as the heart and brain, relatively decreases, so postprandial hypotension occurs.
2. Sluggish pressure reflex. With age, it can induce a decrease in the sensitivity of pressure receptors, autonomic dysfunction, and a weakened response to heart rate increase, causing a decrease in blood pressure.
When frequent postprandial hypotension occurs, it is important to seek prompt medical attention and active diagnosis and treatment under the guidance of a doctor.