Women measuring blood pressure to measure which arm and men measuring which arm is the same standard, regardless of gender, whether it is a man or a woman, usually measuring blood pressure is to measure the patient’s higher blood pressure on the side of the upper extremity. Normal people on the right side of the upper limb than the left side of the upper limb of the blood pressure is higher than 5-10mmHg, bilateral blood pressure difference will not exceed 20mmHg, so when the difference between the blood pressure is abnormal, and even do the determination of blood pressure of the lower limbs of both sides of the measurement of blood pressure, measurement of so much blood pressure is the purpose of a better way to find the side of the limb that can truly reflect the level of blood pressure, to rule out there is no cause of the disease can be searched for.