why does my cat follow me to the bathroom

You go to the bathroom. Your cat comes too. It sits on the edge of the bath, or plants itself on the mat, or reaches a paw under the door if you had the nerve to close it, and it watches you with the calm attention of a supervisor. You are not imagining it. There are real reasons, and none of them are as strange as the habit looks.

Cats are territorial, curious, deeply attached to routine, and quietly fond of their humans, and the bathroom trip triggers all four of those at once. To your cat, you disappearing into a small room and shutting the door is a mystery that demands investigation, a break in the routine, and a threat to the open-door policy it has worked hard to enforce. Following you is the obvious response.

you are part of its territory

A cat likes to know where the important things in its world are, and you are one of the important things. When you move through the house, a bonded cat often moves with you, keeping tabs on its territory and its human at the same time. The bathroom is simply the room you go to that has a door you sometimes close, which makes it the one place the cat cannot casually monitor. That closed door is an affront. The cat intends to be on the correct side of it.

This is also why the paw appears under the door. It is not just impatience. It is a cat confirming that you still exist and reopening a line of communication you rudely severed. Some cats will sit and cry outside a closed bathroom door as though you have gone to sea. From their side, you may as well have.

curiosity, water, and interesting acoustics

Bathrooms are genuinely interesting to cats. There is running water, which many cats are drawn to and some prefer to drink from a tap. There are hard, cool surfaces that feel good to lie on. There are echoes and drips and the strange rituals humans perform in there, all of it novel enough to be worth a look. A cat that follows you in is partly just being a cat in a room full of things to investigate.

Some cats also like the sink or the bath as a napping and lounging spot, cool in summer and pleasingly enclosed. If your cat heads straight for the basin and settles in, the bathroom trip was merely the excuse. The cat was going there anyway.

attachment, routine, and a bit of guarding

Mostly, though, it comes down to attachment. Cats form strong bonds and many simply want to be near their favourite human, and following you room to room is how they do that. The bathroom is not special in the cat's mind. It is just another place you went, so it came. If your cat follows you everywhere and not only to the bathroom, you have your answer. You are the destination.

There may be a whisper of protectiveness in it too. In the wild, an animal relieving itself is briefly vulnerable, and some behaviourists think cats keep watch during your bathroom visits for a similar reason, standing guard over a human who has, in their view, chosen a very exposed moment. Whether that is real instinct or a tidy story, the result is the same. Your cat has appointed itself your bathroom escort, and it takes the role seriously.

should you worry

Not at all. A cat that follows you around is an attached, sociable cat, and the bathroom escort is one of the more harmless expressions of it. The only thing worth noticing is a sudden change. A cat that becomes newly clingy and anxious, following you far more than usual and seeming distressed when apart, can occasionally be signalling stress or illness, which is worth mentioning to a vet. Otherwise, accept the company. You will never use a bathroom alone again, and the supervision, while unnecessary, is meant kindly.

Related reading from my desk: why does my cat sleep on me and why does my cat headbutt me, more of the devotion you did not request.

A sudden, anxious new clinginess can occasionally signal stress or illness, worth a mention to your vet. I am a cat with opinions, not a veterinarian.