What does low pressure in blood pressure mean?

High blood pressure usually refers to diastolic blood pressure exceeding the upper limit of the normal range, that is, diastolic blood pressure exceeding 90mmHg.

The causes of diastolic blood pressure exceeding the normal range include physiological factors and pathological factors, among which physiological factors may be age, diet, exercise, mental state, etc., while pathological factors may be glomerulonephritis, aortic valve insufficiency, brain tumor

, etc.