Whether a low pressure of 84mmHg is normal or not needs to be determined on a case-by-case basis. For normal adults, the ideal blood pressure value is less than 180/80 mmHg. For systolic blood pressure between 120-139 mmHg and diastolic blood pressure between 80-89 mmHg, it is the high value of normal blood pressure, so low pressure 84 mmHg is the high value of normal blood pressure, while hypertension refers to non-systolic blood pressure ≥ 140 mmHg and/or diastolic blood pressure ≥ 90 mmHg measured three times consecutively on the same day. For adults aged 18-65 years, the target value for blood pressure control is less than 130/80 mmHg, while for hypertensive patients in the age group of 65-79 years, the target value for blood pressure control is less than 140/90 mmHg. For elderly hypertensive patients aged 80 years and above, the target value for blood pressure control is less than 150/ Therefore, for hypertensive patients aged 18-65 years, a low pressure of 84 mmHg also indicates poor blood pressure control.