CTS has a couple of causes, and anything that causes swelling of the tendons in the wrist or causes the carpal tunnel to shrink will do it. A major cause is the repetitive motion of someone’s hands. This is especially true if the repetitive movement involves the hands being lower than the wrists, such as the sort of motion that comes with typing or working a cash register.
A doctor tests for the syndrome by checking the feeling and strength in a patient’s shoulders, arms, wrists, and hands. The doctor might have the patient perform the Phalen’s maneuver or wrist-flex test, where the patient presses their hands together to flex the wrists as far back as possible and see if this causes tingling.
Once diagnosed with CTS, the patient might have to wear a wrist splint at night, stop the activities that caused the numbness and pain, and ice the wrist at regular intervals. If the pain does not abate after months of treatment, a patient may need surgery where the ligaments in the wrist are severed.