Hypertension (HTN or HT), also known as high blood pressure (HBP), is a long-term medical condition in which the blood pressure in the arteries is persistently elevated. High blood pressure typically does not cause symptoms. Long-term high blood pressure, however, is a major risk factor for coronary artery disease, stroke, heart failure, atrial fibrillation, peripheral arterial disease, vision loss, chronic kidney disease, and dementia.High blood pressure is classified as primary (essential) hypertension or secondary hypertension.About 90–95% of cases are primary, defined as high blood pressure due to nonspecific lifestyle and genetic factors.Lifestyle factors that increase the risk include excess salt in the diet, excess body weight, smoking, and alcohol use