Head bouncing may be caused by the following conditions: first, because of hypertension, because when blood pressure rises, it will produce a certain pulling stimulation and dilation of the cerebral blood vessels, while the elevated blood pressure will cause certain damage to the intima, if the damage is more serious will cause blood vessel rupture and bleeding. In addition, when the blood pressure rises, the cerebral blood vessels are in a dilated state, which can easily cause the sensory nerves and sympathetic nerves distributed in the walls of the blood vessels or the inner membrane of the blood vessels to be stimulated, which can cause the head to bounce; secondly, it may be due to cerebral hemorrhage, cerebral infarction, cerebral embolism or cerebral hemangioma, etc., because when these diseases are present, they can also easily cause abnormalities in the cerebral blood vessels, such as cerebral Aneurysm will cause the brain arteries to expand, and the blood flow in the brain will increase, which will produce a certain expansion and compression effect on the brain’s meninges and produce the situation of head bouncing.