Cats may follow you into the bathroom as a way to express their love and concern for your safety.

The sound of water and your activities can arouse your cat's curiosity, making them want to join you.

Cats may perceive water as a danger and worry about your safety when you shower, trying to alert you.

Cats rely on smell for identification. If they can't smell you due to soap perfumes, they may become worried.

If your cat is used to a routine, like being fed after your shower, they may follow you to expedite the process.

If this behavior bothers you, consider closing the door or using an opaque shower curtain to limit their view.