Carpal Tunnel Syndrome (CTS) is caused by nerve compression at the wrist when it passes through the carpal tunnel on the palm side of the wrist (Figure 1).
Figure 1 Nerve compression at the carpal tunnel
The carpal tunnel is a passageway for nerves and tendons that control finger sensations and movements respectively.
Swelling or thickening of structures in or around the carpal tunnel may press on the median nerve, leading to tingling, numbness, pain and weakness, usually most prominent over the first three fingers.
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