Common causes of low blood pressure in the elderly include hypovolemia, postural hypotension, severe arrhythmia, cardiac dysfunction, incorrect use of antihypertensive drugs, etc., which need to be analyzed specifically. 1. Hypovolemia: the common causes are low intake of food and water, profuse sweating, diarrhea and other factors that lead to a decrease in the amount of circulating blood in the body and thus a decrease in blood pressure. 2. Postural hypotension: when the elderly suddenly stand up from the lying position, a transient hypotension occurs, and the symptoms can be improved by getting up slowly. 3. Severe cardiac arrhythmia and cardiac dysfunction: slow and fast arrhythmia or a significant decline in cardiac function can cause problems in the circulatory system, leading to a decrease in blood pressure. 4. Incorrect use of antihypertensive drugs: If antihypertensive drugs are used too much or too often, it will easily lead to low blood pressure. There are many reasons for the lowering of blood pressure in the elderly, and if low blood pressure occurs, you should seek medical attention immediately to avoid delaying the condition and risking danger.