Blood pressure is generally measured in the right arm. The blood pressure of the right upper extremity is slightly higher than the blood pressure of the left upper extremity, however, the difference is not greater than 10 mmHg, and it is recommended that the blood pressure of the right upper extremity prevails when measuring blood pressure. If there is atherosclerosis and narrowing of the blood vessels in the right upper extremity, the blood pressure may be lower than the blood pressure in the left upper extremity. If the blood pressure of the right upper extremity is significantly greater than the blood pressure of the left upper extremity, exceeding 20 mmHg, the possibility of stenosis of the left upper extremity should be considered. When measuring blood pressure for the first time, it is recommended that the blood pressure of both upper extremities be measured, with the side with the higher blood pressure prevailing. Cuff-type electronic sphygmomanometers are currently preferred for home use, and with the advent of the mercury-free era, hospital sphygmomanometers are gradually being replaced with cuff-type electronic sphygmomanometers. The standard for normal adult hypertension is a systolic blood pressure greater than or equal to 140 mmHg and/or a diastolic blood pressure greater than or equal to 90 mmHg.