The most common reasons cats stay in their litter boxes

A cat that spends time lying or sitting in the litter box is usually signaling one of a few specific problems: the box itself is uncomfortable or too small, the cat is sick or in pain, the box is too dirty, or the cat is stressed. The behaviour is rarely random. Most of the time, fixing it means identifying which of these is happening and making a change.

Start by watching when your cat uses the box. If he lies in it after going to the bathroom and stays there for several minutes, that often points to pain or digestive discomfort — he may be straining or waiting to see if he needs to go again. If he lies in it without using it, or uses it and then settles in, the box itself or its location is usually the issue.

Key Takeaways

  • A cat resting in the litter box often means pain, illness, or digestive trouble — contact your veterinarian if the behaviour is new or ongoing.
  • Boxes that are too small, too dirty, or placed in stressful locations will cause cats to avoid them or spend time in them reluctantly.
  • Constipation, diarrhea, and urinary tract infections are common medical reasons cats linger in the box and need a vet visit.
  • Stress from household changes, new pets, or loud noises can make a cat retreat to the litter box as a safe space.
  • Increasing the number of boxes, cleaning more often, and moving the box away from noisy appliances often stops the behaviour within days.

Medical reasons: pain, illness, and digestive problems

If your cat is new to this behaviour or does it frequently, a veterinary visit should come first. Cats that linger in the litter box often have constipation, diarrhea, or a urinary tract infection. These conditions make the cat feel like he needs to go, so he returns to the box repeatedly. Pain or straining during elimination keeps him there longer than normal.

Older cats and cats on certain medications are more prone to constipation. A cat with diarrhea may camp out in the box because he cannot predict when he will need to go. Urinary tract infections and blockages create urgency and discomfort, and the cat associates the box with relief. Any of these warrants a call to your veterinarian, especially if you also notice changes in appetite, weight loss, or vomiting.

Hyperthyroidism, kidney disease, and diabetes can also cause cats to spend more time in the box due to increased urination or digestive upset. These are more common in older cats but can occur at any age. Your vet can rule these out with a physical exam and bloodwork if needed.

Litter box size, cleanliness, and placement

A box that is too small forces your cat into an uncomfortable position. The rule of thumb is that the box should be one and a half times the length of your cat's body. If your cat is large or long, a standard box may feel cramped. Covered boxes can feel even smaller and trap odours, making some cats avoid them or use them reluctantly and then stay put out of discomfort.

Dirty litter is another common reason. Cats are fastidious and will use a dirty box if they must, but they often sit in it longer or avoid it altogether. Scoop daily and change litter completely once a week. If your cat is lying in a visibly dirty box, increase scooping to twice daily for a few days and see if the behaviour stops.

Location matters too. A box placed next to a loud appliance like a washing machine or furnace can startle your cat during use. He may then retreat to the box as a safe space away from the noise. Moving the box to a quiet, low-traffic area often resolves this within days. Avoid placing it near his food and water bowls, as cats naturally want to eliminate away from where they eat.

Stress and anxiety as a hiding place

Cats under stress sometimes use the litter box as a refuge. A new pet, a move, loud noises, or changes in the household routine can trigger this. The box is a familiar, enclosed space where your cat feels some control. If your cat is lying in the box but seems otherwise healthy, look for recent changes in his environment.

Introducing a new cat or dog, renovations, or even a change in your work schedule can stress a cat enough to make him retreat. In these cases, the behaviour usually fades once the cat adjusts. Providing additional hiding spots — cat trees, cardboard boxes, or cat tunnels — gives him alternatives and can reduce his time in the litter box.

How many boxes you should have

The standard recommendation is one box per cat plus one extra. If you have one cat, you should have two boxes. If you have two cats, you should have three. This reduces competition and gives each cat options if one box becomes too dirty or is blocked by another cat.

Cats that spend a lot of time in the litter box sometimes do so because they do not have enough boxes to choose from. Adding a second or third box in different locations — one upstairs and one downstairs, for example — often stops the behaviour. Place them away from each other so your cat does not feel trapped.

When to contact your veterinarian

Contact your vet if the behaviour is new, happens daily, or is accompanied by other changes. Signs that warrant a call include straining or crying in the box, blood in urine or stool, loss of appetite, weight loss, vomiting, or a change in the amount your cat urinates or defecates. These point to a medical issue that needs diagnosis and treatment.

Even if your cat seems otherwise healthy, a vet visit is worth it if the behaviour persists for more than a week after you have cleaned the box thoroughly and ruled out obvious environmental stressors. Your vet can check for pain, infection, and systemic illness that may not be obvious to you.

Frequently Asked Questions

Is it normal for cats to nap in the litter box?

Occasional napping in a clean box is not uncommon, especially in kittens or stressed cats seeking a safe space. However, frequent or prolonged lying in the box — particularly after using it — usually signals discomfort, illness, or a problem with the box itself. If it is a new behaviour, have your vet rule out medical issues.

What if my cat lies in the box but does not use it?

This often means the box is too small, too dirty, or placed in a stressful location. It can also mean your cat is stressed and using the box as a hiding spot. Try upgrading to a larger box, cleaning more frequently, or moving it to a quieter area. If the behaviour continues, contact your vet to rule out pain or illness.

Can stress alone cause a cat to stay in the litter box?

Yes. Stressed cats sometimes retreat to the litter box because it feels safe and familiar. If your cat is otherwise eating and acting normally but spending time in the box after a household change, stress is likely the cause. Provide extra hiding spots and maintain a calm routine. The behaviour usually improves within a few weeks.

Should I be worried if my older cat suddenly starts lying in the litter box?

Yes, this warrants a vet visit. Older cats are more prone to constipation, kidney disease, diabetes, and urinary tract infections — all of which can cause this behaviour. A physical exam and bloodwork can identify the problem quickly so treatment can begin.

How long does it take for the behaviour to stop after I make changes?

If the cause is environmental — a dirty box, a small box, or stress — you should see improvement within three to seven days of making changes. If the cause is medical, improvement depends on treatment. If nothing changes after a week of cleaning more often and upgrading the box, schedule a vet visit.