One of the best things about plumbing is that it often tells you when something or the other may be wrong with it.
That might sound somewhat odd to you, but suffice it to say that there is a language that plumbing uses, and while it might not form any actual worlds that a linguistics professional would be able to recognize and codify, it does produce several sounds that can help you realize that it needs a bit of work once all has been said and is now out of the way.
A really common sound that leads to people calling a plumber in Vancouver is a foghorn type noise. Depending on where you hear this sound, it can indicate a minor or a serious problem. If you notice this sound only in your bathroom, try to see if it occurs after you flush. The reason behind this is that a loose or faulty ballcock in your toilet can result in water being forced through a really tight space, and this can make the flush refilling process a lot louder than might have been the case otherwise.
If you notice this noise in every single area of your residence, this indicates a far more serious issue. Your piping might have come loose, or alternatively it might be a little too old for you to work with now. Fixing this problem should be at the very top of your list of priorities because of the fact that it can get a lot worse really fast, and that point you may very well be forced to vacate the premises while a professional fixes whatever it was that went wrong.