A musty smell indoors can also indicate a water leak.
Bathroom wall water damage.
In some cases water damage may be fairly light usually caused by something as simple as water spray escaping around a faulty shower curtain.
Wall cavities affected by water damage are vulnerable to mold growth which also has a pungent musty odor.
In this instance the damage is usually confined to the wall where the showerhead and faucet is located and it may be found anywhere on the wall not just down near.
In most cases the reason for a bathroom wall repair is water damage which is particularly common around the tub and shower area.
Long term leaks can cause structural damage within your walls and can also lead to serious mold problems in the walls.
If there is a strong musty smell near a certain area of your wall there could be a water leak or mold growth behind it.
You can detect leaks in walls by looking for key signs of water damage including peeling paint or wallpaper or patches of discoloration.
Rarely water damage to a tile wall can be caused by leaking pipes within the wall.
Mold on walls and baseboards.
Fortunately water damage caused by missing grout or bad caulking is usually fairly easy to fix.
However not only does it depend on your diy skills but also the size of the repair needed.
If you are in any doubt about making the repair yourself or if the repair is a large job then hiring a professional contractor may be the best option.