Low blood pressure in hypertensive patients may be caused by overdose of antihypertensive drugs, climate change or sudden illness. 1. Overdose of antihypertensive drugs: If hypertensive patients take too much antihypertensive drugs, or take antihypertensive drugs with strong antihypertensive effect, it may cause sudden occurrence of low blood pressure in hypertensive patients. Patients should seek medical advice in time and adjust the type and dosage of drugs under the guidance of doctors. 2. Climate impact: Many hypertensive patients take long-term treatment of antihypertensive drugs, and do not follow the doctor’s instructions to regularly go to the hospital for blood pressure monitoring during the medication. In summer, people’s blood pressure is generally low, so if the type and dosage of antihypertensive drugs are not adjusted in time, it may lead to low blood pressure. 3. Sudden illness: When hypertensive patients suffer from sudden hemorrhage, acute myocardial infarction, or diseases with large loss of body fluids, their blood pressure will drop suddenly, and the patients should be resuscitated. It is recommended that if the blood pressure is abnormal, consult the doctor as soon as possible and improve the examination and treatment under the guidance of the physician.