My wife and I noticed a water stain on our first floor kitchen ceiling that is looking worse almost every day. The stain is small but is getting soft in the middle. The source of the water could be the second floor bathroom but I am not so sure. The stain isn't directly over the bathroom. My question is essentially what should we do? Should I hire a plumber to check the toilet and tub/shower to see if there is a leak around y the drains, or perhaps open up the ceiling where the stain is and possibly "see" where the water is coming from? Any help at all or direction would be appreciated. Thanks.