Carpal tunnel can be caused by a few different factors.
Most people who suffer from carpal have issues with repetitive motion: people who type at a computer, graphic designers, movie editors, etc. Can be prone. It is a key to keep the proper ergonomic form, meaning the way a person sits and holds their body can help stave off carpal tunnel. Water, B vitamins, fish oil and anti-inflammatory herbs can be quite helpful, and have less side effects than conventional over the counter anti-inflammatories. Sleep is important for repair. Sometimes, using a soft brace during physical stressors can help limit progression of the problem, but should not be used 24 hours a day.
In the patients I have worked with I have found in about 30% of cases, the issue is actually not in the wrist area, but in the shoulder. So checking into tight shoulders and nerve impingement closer to the spine can be important.
And finally, no matter what the factors, I will use acupuncture and wrist adjustment/alignment techniques to help it feel better and heal faster.