The majority of patients with hypertension will have both systolic and diastolic blood pressure elevations. Patients with elevated diastolic blood pressure alone are rare clinically and can be seen in younger patients with hypertension. The causes and treatments of high diastolic blood pressure are as follows: Causes: High diastolic blood pressure is associated with increased peripheral resistance and increased heart rate, and is commonly associated with a variety of cardiovascular diseases, such as hypertension, coronary artery disease, atherosclerosis, and so on. In addition, it may be caused by the usual work pressure, irregular life, frequent late nights, high salt diet, smoking and alcohol abuse, high calorie diet, emotional stress and anxiety in young people. These factors may lead to increased water and sodium retention in the patient’s body, and may also abnormally activate the human neuroendocrine system, such as causing sympathetic excitation and activation of the RAS system, thus inducing high diastolic blood pressure. Treatment: First of all, the patient’s poor lifestyle should be adjusted. It is recommended that the patient should eat a low-salt diet, strengthen exercise, control weight, quit smoking, quit drinking, and ensure sufficient sleep, in addition to maintaining a healthy and good state of mind and avoiding late nights. Some patients can control their blood pressure to the normal range by improving their lifestyle. Second, if high diastolic blood pressure still exists after improving lifestyle, blood pressure can be controlled by taking antihypertensive drugs under the guidance of a doctor. These antihypertensive drugs can improve the neuroendocrine system and inhibit the abnormal activation of sympathetic nerves and the RAS system, thus maximizing the improvement of the elevated diastolic blood pressure. If the diastolic blood pressure cannot be controlled in the normal range with the above drugs, a combination of other antihypertensive drugs can be considered for comprehensive treatment.