Just noticed this brown stain above my living room window. I don’t have a ladder at the moment so can’t reach it to touch it but the wallpaper near it is starting to lift so I think it might be damp. But it’s on the ground floor and there doesn’t appear to be anything else around it or in the room above it. My bathroom is on the floor above too but to the right. Could it be water travelling from the bathroom down or getting in from outside? It hasn’t rained locally since Saturday.
You’ll really need to take down the drapes and cut the ceiling drywall away.
Once you do that you’ll be able to see if the water is coming from. It’s pretty hard to know where water is coming from if you don’t do that. Otherwise you’re just going to be making wild guesses.
Also, cutting the dry wall away will allow that wet space to dry so you don’t get mold.