High pressure below 100mmHg is normal. High blood pressure is also called systolic blood pressure and the normal range is between 90 and 139 mmHg. If the systolic blood pressure is lower than 100mmHg but higher than 90mmHg, it belongs to the low normal range. If there are no obvious abnormal symptoms, no treatment is needed, just pay attention to observation. If the patient is hypertensive and is taking medication to lower blood pressure, and the systolic blood pressure is below 100mmHg, it is necessary to adjust the antihypertensive medication. Prevent the blood pressure from being too low, which will bring adverse effects to the body. Since the body’s blood pressure is not static, it is affected by the environment, temperature and emotions. Therefore, if abnormal blood pressure is detected, it is necessary to choose three more different time periods to measure the blood pressure again in the resting state respectively. Therefore, if abnormal blood pressure is found, it is best to consult a doctor in time and follow the doctor’s instructions as soon as possible after a clear diagnosis is made, so as to prevent delays in the condition.