If the patient’s current diastolic blood pressure, also known as low blood pressure, is 99 mmHg, this condition is considered to be hypertension, which is classified as Grade 1 hypertension, or mild hypertension. If the diastolic blood pressure is greater than or equal to 90 mmHg, according to the latest criteria for diagnosing hypertension, the patient is considered hypertensive. If you want to further clarify whether the patient really has high blood pressure, you should also take three measurements on different days instead of one measurement to determine whether the patient has high blood pressure or not. It is also recommended that the patient undergo ambulatory blood pressure monitoring, which measures the overall blood pressure over a 24-hour period to assess whether there is any blood pressure abnormality, and to further assess the severity of the current elevation of blood pressure, which can guide the development of the appropriate medication regimen. For patients with hypertension, it is important to determine whether the hypertension is primary or secondary.