Elderly people may have high blood pressure or low blood pressure due to increased pulse pressure or drastic emotional changes. 1. Increased pulse pressure: hypertension in the elderly is mostly systolic hypertension. It is due to the reduction of elastic fibers in the blood vessel wall and the increase of collagen fibers, resulting in the sclerosis of the arterial wall, the reduction of vascular dilatability and the elasticity of the arteries, thus weakening the buffering effect on blood pressure. Its hypertension is characterized by increased systolic blood pressure, decreased diastolic blood pressure, increased pulse pressure, and the elderly are prone to combining a variety of clinical diseases, more complications, prone to postural hypotension or postprandial hypotension, so the elderly’s blood pressure fluctuates greatly. The blood pressure of the elderly fluctuates day and night, white coat hypertension and pseudohypertension are relatively common. 2. Emotional changes: the elderly are prone to sudden rise and fall of blood pressure due to poor adaptability to the environment and poor regulation of the vegetative nerves. If the blood pressure is high or low, they should go to the hospital in time.