If the patient’s low pressure is 80 mm Hg, it is normal and usually does not require any treatment and regular observation. According to the current classification and definition of blood pressure levels in China, normal blood pressure in adults is defined as high pressure, i.e., systolic pressure fluctuating from 90 to 139 mm Hg, and low pressure, i.e., diastolic pressure fluctuating from 60 to 89 mm Hg. Therefore, a low pressure of 80 mmHg is within the normal range and is a normal blood pressure level. If there are no uncomfortable symptoms, there is no need for any treatment and regular observation is sufficient. Diastolic blood pressure <60 mm Hg and/or high systolic blood pressure <90 mm Hg is called hypotension. A systolic blood pressure ≥140 mm Hg and/or a diastolic blood pressure ≥90 mm Hg without the use of antihypertensive medications is called hypertension. Blood pressure can determine cardiac function and peripheral vascular resistance, and is also an important element in diagnosing disease, observing changes in condition, and judging the effectiveness of treatment. Too low or too high a blood pressure can have serious consequences, so you should monitor your blood pressure regularly in your daily life and seek medical attention if you have any discomfort.