Carpal Tunnel Syndrome
Carpal tunnel syndrome (CTS) happens when the median nerve is compressed at the wrist. Early signs include night-time numbness, tingling in the thumb and first two fingers, and weakening grip. Risk rises with a smaller carpal tunnel, medical conditions (diabetes, hypothyroid, rheumatoid arthritis), pregnancy, obesity, and work that combines force, repetition, and vibration. Ordinary keyboard use alone carries weaker evidence of risk.