The causes of low blood pressure and low blood pressure include postural hypotension, physiologic hypotension, and pathologic hypotension, etc. You can choose to rest, lie down, replenish the volume, transfuse fluids, and use drugs. 1. Postural hypotension: sudden standing will lead to transient hypotension, with transient dizziness and blackness. Generally, it will be relieved by itself, and you can lie down relatively to increase the cerebral blood flow. 2. Physiological hypotension: primary hypotension is mostly seen in frail women, should strengthen physical exercise, can drink more water to increase blood volume. 3. Pathological low blood pressure: low blood pressure caused by excessive bleeding, dehydration, infection, allergy, overdose of antihypertensive drugs, certain heart diseases, endocrine diseases. At this time, we should actively treat the primary disease, replenish blood volume, anti-infection, anti-allergy, etc. We can use Midodrine hydrochloride to raise the blood pressure according to the doctor’s instruction. Patients with hypotension due to pathologic causes are advised to actively seek medical advice and treatment according to the doctor’s instructions, and drugs should be used under the guidance of the physician.