Correcting the water damage in your bathroom is usually a time consuming task depending on the severity of it, but the prevention of such damage is usually within the reach of most homeowners. The fact is that preventing this damage is usually much, much easier than the act of having to actually repair it after it has already occurred. Steam from showers and baths can discolor ceilings and cause mold growth, overflowing toilets onto cracked tile can lead to rotting of the floor underneath it, and there is always the possibility of mold growth. You should do what you can to protect this room in your home, since it is one of the most important rooms along with the kitchen.
There are a few different areas of your bathroom that you need to keep an eye on and look for any sign of abnormalities in on a regular basis. These areas that are the most at risk are the toilet, shower, bath tub, and the sink.
The bath tub and shower usually require some special attention, since these are the largest sources of water in the room and present the most risk. Over time, the tiles around the tub and shower can become cracked and if it is allowed to overflow, the floor underneath can become so damaged that the whole floor will need to be taken up and redone. Missing grout can also cause this. Repair the tile floor as soon as you notice cracks in it. Also make sure that the caulking around the tub is not loose or missing and if it is, you should re-caulk this yourself or have a professional do it for you.
Check the plumbing underneath the sink and make sure that there are no leaks. Loose seals in this plumbing should be replaced as soon as possible, as well.
The toilet can also overflow and the tile around this area can also be breached if it is cracked, so in the same manner as the area around the tub, the cracked tile needs to be dealt with. Keep your toilet from overflowing by not putting more paper in the toilet than it can handle. A lid lock can be purchased and put on toilets in homes that have small children that are prone to putting things in the toilet that do not belong there.
If you can see signs of moisture on the drywall, then you might also have a problem in the plumbing running through the walls. You need to call in a professional to deal with this problem.