High low blood pressure is also known as high diastolic blood pressure. It is mainly associated with increased vascular resistance, increased heart rate, and increased sympathetic tone. Human blood pressure consists of two components, one is high pressure, or systolic pressure, and the other is low pressure, or diastolic pressure. There are many reasons for high diastolic blood pressure, mainly related to increased vascular resistance, increased heart rate, increased sympathetic tone, activation of the renin-angiotensin-aldosterone system, excessive sodium intake, poor dietary and lifestyle habits, and genetic predisposition. High diastolic blood pressure is often seen in young and middle-aged hypertensive patients, high diastolic blood pressure can use antihypertensive drugs to lower blood pressure, commonly used drugs are Benadryl, Enalapril, Irbesartan, Candesartan, Amlodipine, Nifedipine, Metoprolol and so on. The use of drugs should be under the guidance of a physician.