As someone who has dealt with CTS a LOT (I work in insurance - worker's comp... not evil though I promise!), some important points in this discussion -
CTS is caused by -
1. Anatomical shittiness: small carpal tunnel, a dislocation or a fracture causing a tightening of the tunnel.
2. Health issue: Diabetes, weight issue, alcoholism.
3. Fluid balance issues. Pregnant ladies have this happen a lot (twinge spoke on this)
4. Really really aggressive vibratory movements and hard wrist bending. However, in this department, there is very little hard evidence to establish a causal connection, moreso it is an aggravative factor.
For something like typing, there's virtually no evidence that typing and mouse movements cause CTS. As in almost literally none, the newest and best research puts a hard line here. When you are getting carpal tunnel aggravation from typing, you're basically poking a sore with a stick or twisting a broken bone, but the typing itself wasn't why the issue occurred. This is why you get such spotty input from people between "never had an issue in my life" (e.g. me, typing near the 80-90 wpm range for years) and someone who can barely move their hands (usually an overweight person with uncontrolled diabetes or some such thing).
Point being, either do whatever it takes to minimize the personal aggravators (in some cases you're out of luck here), or have surgery. Physio treatments are temporary solutions for odd cases where you don't normally have indicators but for whatever reason the nerve got inflammed.