Blood pressure instability, high and low is more common in the clinic, the most common reasons are as follows: 1. Seasonal changes, if the patient is and seasonal-related changes in blood pressure, in the clinical hypertension patients themselves can observe this situation. As the weather warms up, antihypertensive drugs need to be reduced or reduced in type. If the weather is cold, due to the vasoconstrictive effect, antihypertensive drugs will need to increase the amount or increase the type; 2, irregular medication; 3, mood swings, too much stress, emotional changes can also cause blood pressure changes, patients need to make their own adjustments, or give drugs for anti-anxiety treatment; 4, life rhythm change, life environment changes, such as from the south to the north, or from the north to the south when, also some people just business trips, changing rooms, blood pressure changes may occur. This part of the population needs to monitor the blood pressure, or at least do not let it fluctuate too widely. If the blood pressure only fluctuates between 10-20 mmHg, you just need to adjust your medication without worry. However, if a patient’s systolic blood pressure fluctuates from a normal 130-140 mmHg to 180-190 mmHg, it is important to see a cardiology clinic in a timely manner so that the cardiologist can make adjustments to avoid heart, brain and kidney damage caused by too much blood pressure fluctuation.