Does turning on a shower, faucet or other water using appliance cause your pipes to rattle or vibrate in the wall.
While there are other causes, in this case, it’s likely that the pipe is not securely clamped in the wall. Pipes vibrating in the wall can not only be annoying but can damage the pipes, eventually causing water leaks.
It would be nice if the pipe was exposed and could easily be clamped. Unfortunately, this pipe is hidden in the wall.
The drywall will need to be cut away to fix the problem.
Remember, most plumbers will cut the wall to expose and fix the problem, but very few of them will fix the wall when they are done. They are plumbers, not drywallers.