🚪 The door problem
Why Does My Cat Hate Closed Doors?
They have no interest in the room. They have an enormous interest in the door being shut.
It is about access, not about the room
The giveaway is what happens when you open the door: a great many cats look in, decline to enter, and walk off. They were not trying to get into the bathroom. They were objecting to a part of their territory being closed off.
A cat's home range is a map it maintains and patrols. Every part of it needs to be checkable, because a space you cannot check is a space something could be in. A shut door creates exactly that — a blank region on the map — and it stays a problem until it is resolved.
Escape routes matter more than you think
Cats are both predator and prey, and prey animals are deeply invested in exits. Being somewhere with only one way out is uncomfortable; being somewhere with no way out is alarming. A closed door removes options from the whole floor, not just the room behind it.
This is also why cats dislike being shut in a room with you as much as shut out of one. The issue is the door, in either direction.
And you are behind it
Add social motivation. If you are on the other side, the closed door separates the cat from a member of its group — and from the bathroom specifically, which is a room you reliably stay in for a predictable few minutes, making it the most learnable closed-door event in the house.
Many cats also simply find the ritual rewarding. Scratching the door produces a sound, and frequently produces a human. That is a working strategy and they will keep using it.
What to do about it
Where you can, leave interior doors open or ajar. Most of the conflict evaporates, and it costs nothing.
Where you cannot: make the shut door boring rather than dramatic. Do not talk through it, do not open it in response to noise — that teaches the noise works — and put something genuinely worth doing on your side of it: a feeder puzzle, a window perch, a toy that only appears when the door shuts.
For doors that must stay shut permanently, a cat flap or a propped gap solves it outright. And if the scratching is destroying the frame, a scratching post placed next to the door gives the behaviour somewhere acceptable to land; cats scratch to mark as well as to sharpen, and a door frame is a prominent spot to leave a mark.
Quick answers
Why does my cat follow me to the bathroom and cry outside?
The bathroom is the most predictable closed-door event in the house — you go in, the door shuts, you reappear. It is the one your cat has learned best, and it separates you from the group for a few minutes.
Is it cruel to shut my cat out of a room?
No. Cats cope perfectly well with parts of the house being off limits, provided the arrangement is consistent. What they find harder is a door that is sometimes open and sometimes not.
How do I stop my cat scratching the door?
Put a scratching post right beside it and stop responding to the scratching. Opening the door in response — even to tell the cat off — teaches it that scratching produces a human.