Carpal tunnel syndrome is caused by compression of the median nerve in the carpal tunnel. Symptoms include numbness and tingling in the hand that worsens at night. Diagnosis involves tests like Durkan's test and Phalen's test. Treatment begins conservatively with splinting, NSAIDs, and steroid injections. Surgery is considered if symptoms do not improve. De Quervain's tenosynovitis involves inflammation of tendons in the wrist and causes pain and tenderness over the thumb side. Diagnosis is via the Finkelstein test. Treatment includes splinting, injections, and possible surgery. Trigger finger causes catching or locking of the fingers and is due to tendon sheath