No one wants it, yet it's the body's way of getting your attention when something is wrong. You're probably sufficiently in tune with your body to know when the pain is just a bother, perhaps the result of moving furniture a day or two before or eating that third enchilada.
Wrist Blood Pressure Monitors use the radial artery to measure blood pressure instead of the more commonly used brachial artery. The key is to place the monitor on your wrist properly, just above the wrist bone and then to hold your wrist up level with or above your heart.
A cuff that is too small will cause a falsely high blood pressure. A cuff that is too big will cause a falsely low blood pressure. Do not take a BP reading in an arm that is injured or has an IV or shunt. Do not check your blood pressure within 30 minutes of smoking, drinking coffee, or exercising. These may affect your BP reading. Rest quietly for 5 minutes before you take your BP.