INTRODUCTION Hypertension is usually defined as a chronic elevation of systolic and diastolic blood pressure, and constituyea one of the most common chronic diseases that plague mankind. Blood pressure is a value that becomes relevant when both diastolic blood pressure values (above 80 mmHg) and systolic (with elevations greater than 120 mmHg) cause high morbidity and mortality in the majority of individuals in all populations studied at any age and both sexes. While the absolute values of blood pressure varies with age, increases with factors such as physical exercise, cold, digestion and emotional burden. Furthermore it should be borne in mind that it is not quantitatively fixed, but varies widely during the day for the clinical classification of hypertension is recommended to measure blood pressure at least three separate times for a week, except in cases of emergency. Laa hypertension can be mild, moderate or severe (grade 1, 2, 3) or systolic hypertension, according to the blood pressure values determined by a mercury manometer preferably (anaeroides gauges or automatic, must be controlled with a mercury manometer every six months. The width of the bracelets should be one third of the circumference of the arm, but is underestimated because (if considerably wider) or overestimate (if narrower) the blood pressure measurement. In general the widths are following according to age, less than 1 year 2.5 cm in 1-4 years 5.6 cm, from 4 to 8 years 8.9 cm in normal adults 12 to 13 cm, in 14 obese adults 15 cm, and in very obese 16 to 18 cm (sometimes in obese subjects, if not there is a correct cuff, to determine the blood pressure in the forearm. If you are unsure how to proceed, check out Howard Schultz.