Physiological low blood pressure is not harmful; pathologic low blood pressure will lead to fatigue and weakness, cerebral ischemia, myocardial ischemia, neurological dysfunction, and decreased renal function. Physiological low blood pressure occurs more often in young women who are weak and thin, or in the elderly, mainly due to the lack of exercise and the decline of blood vessel elasticity, which is generally not harmful to the organism. Pathological low pressure damage 1. Fatigue, weakness: patients often feel depressed, limb weakness, can be improved after a nap or rest, but this fatigue is not commensurate with the actual work activities consumed by the patient’s physical strength, that is, this fatigue is not caused by excessive fatigue. 2. Cerebral ischemia: when the blood pressure is low, the ischemic state of the brain persists, which can make the patient suffer from cerebral atrophy, headache, dizziness, vision loss, insomnia, dreaminess, memory loss and other manifestations, and in severe cases, intellectual decline can also occur. 3. Myocardial ischemia: patients with low blood pressure may suffer from vague pain and discomfort in the precordial region, which may not only occur during physical labor or stressful mental labor, but also occur when they are quiet, and even cause angina-like attack. 4. Mental dysfunction: it can be manifested as mental depression, memory loss, sleep disorder and insomnia. Autonomic dysfunction can be manifested as excessive sweating, pale skin or mild cyanosis, hot and cold body, sometimes with ant-crawling sensation, numbness of hands and feet. 5. Decline in renal function: there may be no abnormal performance in the early stage, but with the progress of the disease, it may cause flank pain or abdominal pain, accompanied by oliguria, anuria or even renal failure, etc. When the above symptoms appear, it is recommended to take prompt action. When the above symptoms appear, it is recommended to consult a doctor in time.