Low blood pressure of more than ninety is generally not serious, if the low pressure for a long time more than ninety, this situation is more serious. Low pressure more than ninety that is, diastolic blood pressure is mildly high, normal blood pressure for systolic blood pressure 90 ~ 139mmHg and diastolic blood pressure 60 ~ 89mmHg, diastolic blood pressure more than ninety mmHg over the normal blood pressure. Grade 1 hypertension > 140mmHg ~ 90mmHg, grade 2 hypertension greater than 160mmHg ~ 110mmHg, grade 3 hypertension greater than 180mmHg ~ 120mmHg, the higher the level the more dangerous. Low blood pressure more than ninety belongs to grade 1 hypertension. If the patient has a long period of strenuous exercise, emotional fluctuations, long-term consumption of high-calorie food will cause high diastolic blood pressure, this situation is generally not serious, after adjusting the life, dietary habits of blood pressure can be returned to normal. If the diastolic blood pressure is high for a long time, it will cause damage to the tissues and organs, such as cerebrovascular disease, cardiovascular disease, kidney disease, etc., which will have a great impact on the health. Patients with blood pressure below ninety or more need to adjust their diet, eat less high-calorie, high-fat food, such as butter, butter, cream, etc., pay attention not to overeat, or smoke and drink, avoid staying up late, and ensure sufficient sleep time. The patient’s blood pressure has been elevated, should go to the hospital in time to avoid adverse consequences.