High low pressure is also a kind of high blood pressure, there are two main reasons for primary hypertension and secondary hypertension. 1. The low pressure when measuring blood pressure is also called diastolic blood pressure, and an elevated diastolic blood pressure greater than 90 mmHg also belongs to the category of hypertension, which is categorized into primary hypertension and secondary hypertension. Secondary hypertension is more common in renal artery stenosis, renal parenchymal injury, and primary aldosteronism, Cushing’s syndrome and other endocrine diseases. 2. Elevated diastolic blood pressure is mainly due to the patient’s heart rate is too fast blood vessels, the elasticity is still good, more common in middle-aged and young people. 3. The treatment of elevated diastolic blood pressure first needs dietary control, low-salt diet, coupled with changes in lifestyle habits, such as moderate exercise, adequate sleep, if it can not be completely reduced to normal, the need for drug therapy. The medication for hypertension should be administered under the guidance of a physician. Do not choose your own medicine to avoid side effects.