The Evaluation for Fu's Subcutaneous Needling (FSN) in Carpal Tunnel Syndrome.

The goal of this clinical trial is to evaluate the efficacy of Fu\'s Subcutaneous Needling (FSN) in carpal tunnel syndrome (CTS). The main questions it aims to answer are: * Dose FSN improve the symptoms of CTS? * Dose FSN decrease cross section area of median nerve in CTS patients? * Dose FSN have the effect of electrophysiology exam in CTS patients? Participants will receive wrist splinting and FSN treatment respectively. Researchers will compare wrist splinting group with FSN group to see if FSN being effective for CTS.