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.
However a number of wrist monitors are now clinically validated, but readings at home may be inaccurate if the wrist is not held at heart level. For this reason, the British Hypertension Society recommends the use of upper arm monitors in preference to wrist monitors.