It's one of the most common reasons cats get surrendered, and one of the most avoidable. When a cat stops using the litter box, the instinct is to assume it's being difficult or "getting back" at you for something. Cats don't work that way. Almost every case of sudden litter box avoidance traces back to either a medical issue or stress — and it's worth ruling out both before assuming the worst.
Rule Out Medical First
Urinary tract infections, bladder stones, and kidney issues can all make urination painful, and a cat will start associating that pain with the box itself. If the change is sudden, a vet visit should always come before anything else on this list.
What Stress Looks Like in a Litter Box
Once medical causes are ruled out, stress is the next most common cause. A new pet, a move, a change in routine, a box that's suddenly too close to a noisy appliance, or even a new brand of litter can be enough. Cats mark territory and communicate safety through scent, and their facial pheromones play a big role in what they consider "their" space. When that sense of territory gets disrupted, litter box habits are often the first thing to slip.
What Helps
Keep the box in a quiet, low-traffic spot, away from food and water. Stick to one litter type once you find one that works. And consider a feline facial pheromone product, which mimics the scent cats naturally leave when they're marking a space as safe — it won't override a genuine medical issue, but for stress-driven cases, it's one of the lowest-effort things you can try.
Our Calming Pheromone Collar and Calming Pheromone Spray both come in cat-specific formulas.