So, some ceiling stains have come up. This is in the living room and the bathroom is located just above the ceiling. The most likely cause of all this is from the bathroom, one would assume. The caulking looks good and there doesn't seem to be any cracks anywhere in the bathroom but I am going to start caulking later today.
Now, yesterday I noticed the spot was very faintly wet to the touch. The bath has not been used today and won't be for a few days. The strange thing to me is that the stain runs opposite the bathtub (so if you consider the stain streak to be horizontal, the bathtub is placed vertically). I'm not sure if that has relevance to the issue, though.
My biggest fear would be that this is going to end up being a leaky pipe (the house is 20 years old). If nothing helps in the next few days, I'll be calling a plumber in to inspect.
Worst case Ontario, taking out drywall/patching up the pipes, does anyone know how much that is going to potentially cost depending on severity of damages?