Carpal Tunnel Syndrome is actually very common in pregnant women. The swelling in hands can directly pinch the ligaments, especially when retaining water, and pinch that hand-controlling nerve and creates pain pressure and decreased mobility in your hand.
Best things to do to alleviate are the same as water retention.
1)Magnesium supplements - a fast absorbing one especially, like magnesium glycinate, gluconate, citrate asparate ect...Start doses slowly with food, and increase until you notice swelling and pain decreasing. But, reduce doses if you notice any diarrhea, fatigue or muscle weakness.
2)If you choose to take magnesium, you may want to add a good dose of vitamin B complex too, about 25 to 50 mg, it increases the efficiency of magnesium supplements.
3)Evening Primrose oil capsules will also bring down swelling and discomfort. 125 mg should do the trick.
And my favorite - ACCUPUNCTURE!! Try that out, and hopefully you should be able to alleviate some of the symptoms. That can be so irritating, I had that too with this one. But, alot of the above helped me out quite a bit.