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A total of nine flexor tendons (not the muscles themselves) pass through the carpal tunnel: 1  flexor digitorum profundus (four tendons) 2  flexor digitorum superficialis (four tendons)  flexor pollicis longus (one tendon)
Carpal Tunnel Syndrome. Among the causes of joint pain, this syndrome is the number one cause of pain among the fingers. This syndrome occurs when the tendons in the tunnel swell or bloat. Aside from the aches, carpal tunnel syndrome also brings numbness of the thumb, ring and index finger.