Leaking bathtub faucets can be caused by a variety of issues, including worn-out washers, damaged O-rings, or faulty cartridges. While some leaks may be minor and only require a simple tightening of the packing nut, others may require more extensive repairs.
If you’re not comfortable making repairs yourself, it’s best to call a plumber. However, if you’re handy and have some basic tools, you may be able to fix the leak yourself.