There are many causes of low blood pressure, which may be caused by malnutrition and overdose of antihypertensive drugs. Hypotension may cause fatigue of the organism, headache, nerve dysfunction, endocrine disorders and so on. 1. Causes of hypotension: (1) There are some healthy people who have hypotension without any symptoms or any organ abnormality, which is generally physiologic low blood pressure, and if there is no discomfort, it is usually not necessary to consult a doctor. (2) Secondary tuberculosis, malignant tumor, malnutrition, etc. can cause chronic hypotension, which can be gradually aggravated. (3) Hypotension is often caused by inappropriate use of antihypertensive drugs in the course of hypertension treatment. Such as the use of three or more than three kinds of antihypertensive drugs, unauthorized addition to the dosage; antihypertensive drugs and vasodilator drugs with the same cause of improper use of combined medication, etc. will be in the process of treatment of hypertension patients caused by low blood pressure. 2. Harms of hypotension: (1) Hypotension can lead to neurological dysfunction, which is manifested as sleep disorder, insomnia, fatigue and weakness. (2) Hypotension can lead to insufficient cerebral perfusion, which is manifested as dizziness and headache. (3) In addition, hypotension can also cause patients with vague pain in the precordial region, loss of appetite, indigestion, etc. Patients with low blood pressure should seek prompt medical treatment and have their blood pressure measured regularly.