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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)
Common conditions that can lead to carpal tunnel syndrome include obesity, pregnancy, hypothyroidism, arthritis, diabetes, and trauma. Tendon inflammation resulting from repetitive work, such as uninterrupted typing, can also cause carpal tunnel symptoms.