Symptom guide

Why Is My Cat Peeing Outside the Litter Box? Causes and Fixes

Medical problems, litter box dislikes, stress and marking: why cats pee outside the litter box, how to tell which it is, and how to fix it.

Updated October 2026 · 9 min read · By the Hushku editorial team · 2 sources

Book a routine vet visit. Book a vet check; emergency if straining with no urine

Short answer

Start with a vet check, because urinary problems, kidney disease, diabetes, thyroid disease and arthritis are common causes. If your cat is healthy, look at the litter box set-up (one box per cat plus one, unscented fine litter, cleaned daily, in quiet places) and at stress. A male cat straining with little or no urine is an emergency.

Key facts

Always rule out medical causes first: urinary problems, kidney disease, diabetes and arthritis.
Provide one litter box per cat plus one, with unscented, fine litter about 1–2 inches deep.
About 10% of neutered males and 5% of neutered females spray.
A male cat straining with no urine is an emergency.

This guide is general information, not a diagnosis. If your pet seems unwell, or you're worried, call your vet.

Overview

Peeing outside the box is one of the most common reasons cats are given up, but it is almost always fixable once you know the cause. Cats don't do it out of spite.

Is it spraying or peeing? Spraying (marking) is small amounts of urine on upright surfaces, such as walls, doors and the backs of sofas, with the cat standing and the tail raised and quivering. It's most common in unneutered males, but Cornell's Feline Health Center notes about 10% of neutered males and 5% of neutered females spray too. Inappropriate urination is usually puddles on floors, beds, rugs or clothes.

Go to a vet now if you see

Straining in the box with little or no urine, especially in a male cat
Crying in pain, licking the genitals a lot, vomiting or hiding
Not having peed for 12 hours or more

Common causes

1. Urinary tract problems
Serious
Cystitis, bladder stones and infections make peeing painful, so cats link the box with pain. Signs: frequent small pees, straining, crying, blood.
2. Other medical problems
Needs a vet
Kidney disease, diabetes and hyperthyroidism make cats pee more; arthritis makes high-sided boxes hard to climb into.
3. Litter box dislike
Usually mild
A dirty box, scented litter, a hood, a liner, a box that's too small or in a noisy or busy spot.
4. Not enough boxes
Usually mild
In multi-cat homes, one cat may block another's access. The guide is one box per cat plus one, in different places.
5. Stress
Usually mild
New people, pets, building work, moving furniture or cats outside the window can trigger peeing outside the box or spraying.
6. Marking (spraying)
Usually mild
Territorial marking, more common in unneutered cats and homes with many cats.

What you can do at home

Provide one litter box per cat plus one, in different quiet, easy-to-reach places, away from food.
Use unscented, fine-grained clumping litter about 1 to 2 inches (3 to 5 cm) deep; most cats prefer uncovered boxes.
Scoop at least daily and wash the box regularly with mild detergent.
Clean soiled spots with an enzyme cleaner; avoid ammonia, which smells like urine.
Never punish your cat; it adds stress and makes the problem worse.
Make soiled areas less appealing (cover them, put food bowls or toys there) while you fix the cause.

When to see a vet

Always, before assuming it's behavioural
Any straining, blood in the urine or frequent small pees
Drinking or peeing more than usual
Spraying that continues after neutering and changes at home

Prevention

Neuter cats before they start marking
Keep enough clean boxes in quiet places
Introduce changes (new litter, box or location) gradually
Give each cat in a multi-cat home its own resources and space

Sources

We check guides against veterinary sources and update them when guidance changes. How we write and review.

Questions.

How many litter boxes do I need?

One per cat plus one extra, placed in different areas rather than side by side.

Why does my cat pee on my bed?

Soft, absorbent surfaces that smell of you can be appealing to a cat that is stressed, in pain or unhappy with its litter box. Start with a vet check, then review the litter set-up and sources of stress.

Do pheromone diffusers help?

Synthetic feline facial pheromone (such as Feliway) may help reduce spraying and stress-related problems alongside other changes, but it won't fix a medical or litter box problem on its own.

Key facts

Overview

Go to a vet now if you see

Common causes

1. Urinary tract problems

2. Other medical problems

3. Litter box dislike

4. Not enough boxes

5. Stress

6. Marking (spraying)

What you can do at home

When to see a vet

Prevention

Sources

Questions.

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