Unstable blood pressure in the elderly is related to factors such as autonomic decompensation, irregular medication and emotional instability. 1. Autonomic hypofunction: Elderly people are older and prone to physiologic hyponomic function. Autonomic nerves can maintain normal blood pressure after a change in position through vasoconstriction. If the autonomic function of the elderly is reduced, they cannot regulate their blood pressure during a change in position, which can easily lead to unstable blood pressure. 2. Irregular medication: To stabilize blood pressure, regular medication is needed. Frequent change of medication or stopping medication blindly will easily cause blood pressure fluctuation. 3. Emotional instability: some of the elderly are easily agitated, which can easily cause blood pressure fluctuations. If the old man’s blood pressure is unstable, it is recommended to consult a doctor in a timely manner, with the help of a doctor to clarify the cause of the disease, and to carry out targeted treatment or therapy.