Low blood pressure is diastolic pressure, the normal range of diastolic pressure in adults is 60-89mmHg, eighty-something years old blood pressure diastolic pressure 50mmHg is lower than the normal range, belongs to the abnormal, may be due to physiological factors such as old age, but also may be with the taking of antihypertensive drugs, arterial valve stenosis, etc. Caused by the reason. 1. Physiological factors: the elderly in their eighties because of vascular elasticity will be reduced, atherosclerosis is relatively serious, neurovascular regulation function degradation and other vascular characteristics, may make the diastolic blood pressure relatively low, low blood pressure in the elderly, but if there is no any uncomfortable symptoms, it means that the body has already tolerated, do not need special treatment, and close monitoring of blood pressure can be. 2. Pathological factors: the elderly often suffer from hypertension, may be due to the use of antihypertensive drugs in too large a dose resulting in low diastolic blood pressure; may also suffer from aortic valve closure insufficiency, arterial valve severe stenosis and other cardiac diseases; may also myocardial infarction, malignant tumors, anaphylaxis and other diseases. Long-term lower diastolic blood pressure can appear dizziness, fatigue, and even important organs with insufficient blood supply, such as angina pectoris. The lowering of diastolic blood pressure in the eighties should be treated promptly, and early intervention measures should be taken after the etiology has been clarified to prevent the adverse effects and serious consequences of hypotension.