Blood pressure 138/91mmHg, diastolic blood pressure 91mmHg is higher than the normal high value, so blood pressure 138/91mmHg is high, belongs to the first level of hypertension. Normal adult quiet state blood pressure range is more stable, the normal range of systolic blood pressure 90 ~ 139mmHg, diastolic blood pressure 60 ~ 89mmHg. Measurement of blood pressure 138/91mmHg, diastolic blood pressure 91mmHg is higher than the high value of the diastolic blood pressure, so the blood pressure 138/91mmHg is high, belongs to the first level of high blood pressure, is high. The diagnosis of hypertension is mainly based on the blood pressure value measured in the clinic, measuring the blood pressure of the upper arm dirty arterial area when sitting quietly at rest, generally need to be measured three times on the same day, systolic blood pressure are ≥ 140mmHg (or) diastolic blood pressure are ≥ 90mmHg can be diagnosed as hypertensive disease. If the blood pressure is elevated, it is recommended to consult a physician for evaluation of the blood pressure under the guidance of a medical professional. It is necessary to improve the lifestyle and maintain a low-salt and low-fat diet.