Phytodynamics can lead to low blood pressure. The phytodynamics system refers to the autonomic nervous system, which belongs to the peripheral nerves, including sympathetic and parasympathetic nerves, both of which work in harmony to make the body work properly. The regulation of blood pressure depends on the heart and large blood vessels, the heart can contract normally to maintain a certain heart rate, and large blood vessels can contract and expand at regular intervals, and the two operate in coordination to maintain blood pressure. When autonomic nerve function is disturbed, the heart’s frequency is abnormal, and the contraction and dilation of the blood vessels become dysfunctional, easily leading to blood pressure fluctuations. The most common type of hypotension is upright hypotension, in which the patient’s blood pressure is normal when lying down, but when upright, the heart rate does not increase quickly and the blood vessels do not contract in time, resulting in blood retention in the body circulation and causing low blood pressure.