What is meant by hypertension? A: Systolic blood pressure ≥ 140 mmHg and/or diastolic blood pressure ≥ 90 mmHg measured on 3 non-same days without anti-hypertensive medication can be diagnosed as hypertension. Patients with a previous history of hypertension who are currently taking anti-hypertensive medication should also be diagnosed with hypertension although their blood pressure is below 140/90 mmHg. Hypertension is the most common chronic disease and the most important risk factor for cardiovascular disease, with major complications such as stroke, myocardial infarction, heart failure and chronic kidney disease, which not only cause high rates of disability and death, but also severely consume medical and social resources and impose a heavy burden on families and the country.