First would be to get an accurate diagnosis.
To know if it is actually carpal tunnel syndrome causing the symptoms?

It could be that. It could be many other causes.
Does this person have fluid retention for any reason? Overweight? Either condition can in itself cause pressure to build in the area of the carpal tendons and wrist, which can create symptoms of pain.

Or could be caused by injuries to the neck, shoulder or of course wrist & hand. If there is a misaligned or herniated disc, excessive tension or injury in neck or shoulder this too can create pain via the nerve path which can be felt sometimes in the wrist and hand.
Similar entrapment of nerve or blood vessels can occur if the pectoralis minor or scalenes are causing an entrapment.

Then of course there is the wonder product of repetitive use easily found in modern life, which can evolve into cts. Basically the muscles, tendons and / or synovial sheaths hypertrophy / enlarge in an anatomical space designed for smaller counterparts.

Obviously in such cases first is to cease doing whatever action(s) are causing or furthering such repetitive damage.
May be helped by various routes.
Some people are quick to turn to surgery for corrective action. Even when other less invasive or expensive means could help. Sometimes maybe thats the best route? I will leave that up to other more relatively experienced people to offer.
May be useful to have some focused massage to help remove fluid buildup and release adhesions and scarring of tissues? Depending on where the body is at.
Differing opinions on immobilization or mobilization. One aspect of this worth considering is posture, not only when writing, typing or other frequent daily activities. What about when sleeping? Some people tend to curl their arms and wrists inward when sleeping, which can aggravate such a condition over time. In such cases, using some type of brace to keep the wrist straight so there is no tension or pressure put on the joint & soft tissues could be useful. Hopefully that would self-correct sooner than later by awareness of posture and persistence.

This is at least a simple overview and some considerations. There are others as well.
I am sure there are others in this tribe who can offer other options & suggestions as well.

As a former musician, we used to have to deal with this often -as well as folks on the job.

It depends on if it's just a matter of blood or fluid flow or actual damage. We used to put our hands at our sides while standing and clinch our fists tight for about 3-5 seconds and release. Repeat several times. Then with hands at sides open and close several times to increase fluid flow. We used to do these stretching exorcises too.

www.eatonhand.com/hw/ctexercise.htm

www.ninds.nih.gov/disorders...tunnel.htm

I have carpal tunnel, from poor ergonomics at my desk. (I'm not nearly tall enough for all of the "one-size-fits-all" office furniture.)

My advice – treat with heat, icy hot / tiger balm, aspirin as needed.

Go to a chiropractor for diagnosis and treatment. Skip the surgery. A chiropractor can move everything back into place – mind you, it's not an instant one-trip process. Depending on how bad you are, it can take several visits to get back to normal, and then you'll have to have "maintenance" visits to keep it that way.

Most of my carpal tunnel was caused by my neck being out of whack after having whiplash 3 times. Neck to shoulder to elbow –> wrist pain.

It's cheaper than surgery – even in the long run – because it requires no absence from work, no recovery time. ("But it doesn't fix it once and for all." Niether does surgery. I've known people who have had to have the surgery several times.)

B-6 and Magnesium