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It could be a lot of expensive things but if are lucky, (as I was), the problem could be as simple as a rusted out shower arm pipe. I am not exactly sure what it is called but it is the 8" long pipe that screws into the pipe inside the wall, going from the valve to the shower head. Mine had rusted, creating a pin hole that dumped water inside the wall whenever the shower was on.
The solution for me was to remove and replace that little piece of shower arm pipe for about $10.
Another shower had a more serious problem that I only discovered when I did a bathroom remodel. Water had been leaking through the tile for years rotting all the wood framing. This was a very costly repair.
Hopefully you have the first problem I described.
Bob
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