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.
Swelling in the wrist causes the compression in carpal tunnel syndrome. The pain is due to excess pressure in your wrist and on the median nerve. Aside from causing wrist pain, carpal tunnel syndrome can lead to numbness, weakness, and tingling on the side of your hand near the thumb.