It is not possible to generalize about how low blood pressure can be dangerous in the elderly, but if an elderly person has a systolic blood pressure of less than 90mmHg and a diastolic blood pressure of less than 60mmHg, it is important to find out the cause of the problem and make lifestyle adjustments under the guidance of a doctor. Low blood pressure refers to the blood pressure <90/60mmHg, this low blood pressure will bring a series of other human body damage, generally include the following kinds of situations:. 1. Coronary artery damage:If the blood pressure of the elderly is lower than 90/60mmHg, especially lower than 60mmHg, it may affect the blood supply of the coronary arteries themselves. If the blood supply of the coronary artery itself is not good, it will cause a series of symptoms such as coronary heart disease, angina pectoris and even myocardial infarction. 2. Cerebrovascular damage:If the blood pressure of the elderly is lower than 90/60mmHg, it will cause a series of performance of cerebrovascular insufficiency, such as dizziness and blackness in front of the eyes, or even fainting. 3. Kidney damage:The blood perfusion of the kidneys in the elderly usually depends on the blood pressure level. If the blood pressure is too low and persistently low, it will affect the blood supply to the kidneys and aggravate kidney damage. 4. Other secondary injuries:In addition to disease, we should also consider the impact of blood pressure <90/60 mmHg on balance and cognition, which may lead to a series of symptoms such as falls, dizziness and other symptoms, which may lead to secondary injuries, especially vital organ injuries caused by falls, bone fractures, and urinary tract infections and lower extremity venous thrombosis after bed rest. Warm reminder: the occurrence of low blood pressure in the elderly, please consult a doctor in time.