HTN is an abbreviation for hypertension, which is a medical term used to describe a condition in which the blood vessels have persistently raised pressure. Hypertension is characterized by a persistent elevation in arterial pressure, and the current definition of hypertension is systolic blood pressure (SBP) values of 130 mm Hg or more and/or diastolic blood pressure (DBP) of more than 80 mm Hg. Hypertension is a common condition that affects the bodys arteries, and it can be serious if not treated. In fact, hypertension is the leading cause of death and disability-adjusted life years worldwide since the year 1990. Hypertension can be managed with lifestyle changes, such as a healthy diet and regular exercise, and medication.