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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)
The pain in your carpal tunnel is due to excess pressure in your wrist and on the median nerve. Inflammation can cause swelling. The most common cause of this inflammation is an underlying medical condition that causes swelling in the wrist, and sometimes obstructed blood flow.