The most common reasons cats stay in or return to the litter box

A cat that spends unusual amounts of time in the litter box—or lies down in it—is usually telling you something is wrong. The most frequent causes are a urinary tract infection, digestive upset, or a litter box problem itself. Less often, it signals stress, a medical condition affecting the kidneys or thyroid, or straightforward that your cat finds the box more comfortable than their bed.

The key is to watch what your cat is actually doing in there. A cat straining to urinate or defecate, going in and out repeatedly, or crying while using the box needs a vet visit within a day or two. A cat who straightforward naps in the box is less urgent but still worth investigating, because comfort-seeking in a litter box usually means discomfort elsewhere.

Key Takeaways

  • Frequent trips to the litter box, straining, or crying during use are signs of urinary tract infection or digestive problems and need a veterinary exam.
  • A cat lying down to rest in the litter box often means they are seeking a quiet, safe space because they feel unwell or anxious.
  • Litter box problems—not enough boxes, infrequent cleaning, or a box in a noisy location—can make cats avoid the box or spend excessive time there.
  • Kidney disease, hyperthyroidism, and diabetes all cause increased urination and can lead cats to spend more time in or near the litter box.
  • If your cat's behavior changes suddenly, contact your veterinarian rather than waiting to see if it resolves on its own.

Urinary tract infections and blockages

A cat with a urinary tract infection (UTI) will often sit in the litter box for longer than normal, straining to urinate, and may produce only small amounts of urine. Male cats are at higher risk for urinary blockage, which is a medical emergency—a blocked male cat may strain repeatedly with little or no output and will need emergency care within hours.

If your cat is crying, meowing, or showing obvious discomfort while in the box, or if you notice blood in the urine or litter, call your veterinarian the same day. Do not wait. A vet can diagnose a UTI with a urinalysis and will prescribe antibiotics if infection is present. Blockage requires when ready intervention to clear the urethra.

Digestive problems and constipation

Cats with diarrhea, constipation, or inflammatory bowel disease often spend extra time in the litter box because they need to go frequently or are uncomfortable. A constipated cat may strain in the box for several minutes with little result. A cat with diarrhea may make many trips throughout the day.

Changes in diet, dehydration, hairballs, or lack of fiber are common causes. If your cat's bowel habits have changed—fewer stools, harder stools, or loose stools—and the behavior lasts more than a day or two, mention it at a vet visit. In the meantime, may support your cat has access to fresh water and consider adding a small amount of canned pumpkin (plain, not pie filling) to their food, which can help both constipation and loose stools.

Litter box setup and maintenance issues

Sometimes the cat is not sick—the litter box itself is the problem. A box that is too small, not cleaned often enough, placed in a noisy or high-traffic area, or filled with litter your cat dislikes can cause them to avoid it or spend anxious time in it. Some cats will lie in the box as a way of claiming it or expressing frustration.

The standard rule is one box per cat plus one extra, all cleaned daily. If you have two cats and one box, or if the box sits next to a washing machine or in a hallway where the cat feels exposed, try adding a second box in a quieter location. Some cats prefer unscented litter, while others dislike clay and prefer paper or pine. If you have recently changed litter brands or types, switch back and see whether the behavior improves.

Stress, anxiety, and seeking a safe space

A cat that lies down and rests in the litter box—rather than straining or going in and out repeatedly—is often seeking a quiet, enclosed space because they feel unsafe or anxious. The litter box is familiar, has their scent, and feels like a den. A cat under stress from a new pet, a move, loud noises, or changes in routine may retreat there.

Look for other signs of stress: hiding in other places, not eating normally, excessive grooming, or aggression. If stress seems likely, reduce disruptions, provide hiding spots away from the litter box (like a cat tree or cardboard box in a quiet room), and keep the cat's routine as stable as possible. If stress-related behavior persists for more than a few days, mention it to your vet, who can rule out medical causes and discuss options like pheromone diffusers or other calming strategies.

Chronic kidney disease and other systemic conditions

Older cats or cats with chronic kidney disease urinate more frequently and in larger volumes because their kidneys cannot concentrate urine normally. This means more trips to the litter box and sometimes spending more time there. Hyperthyroidism and diabetes also cause increased urination and thirst.

If your cat is an older adult and you have noticed increased litter box visits over weeks or months, combined with increased water drinking, weight loss, or changes in appetite, ask your vet for bloodwork. These conditions are manageable with treatment, and early diagnosis makes a real difference in your cat's quality of life and how long treatment remains effective.

When to call the veterinarian

Contact your vet the same day if your cat is straining, crying in the box, producing blood in urine or stool, or if a male cat is not producing urine at all. These are urgent signs. Schedule an appointment within a few days if your cat's litter box habits have changed noticeably—more frequent trips, longer time spent in the box, or a sudden preference for lying in it—even if there are no obvious signs of pain.

Bring a description of what you have observed: how many times per day your cat is using the box, whether output looks normal, and how long the behavior has been happening. If possible, note any other changes—appetite, water intake, energy level, or weight. This information helps your vet narrow down the cause and decide whether bloodwork, urinalysis, or imaging is needed.

Frequently Asked Questions

Is it normal for a cat to nap in the litter box?

Not usually. While a cat may occasionally rest there briefly, regular napping in the litter box suggests the cat feels safer or more comfortable there than elsewhere—often a sign of illness, pain, or stress. A vet visit can rule out medical causes.

My cat keeps going in and out of the litter box but not much comes out. What does this mean?

This is a classic sign of either a urinary tract infection or, in male cats, a potential blockage. Straining with little output is a medical concern and warrants a same-day or next-day vet visit. Do not wait to see if it improves.

Can a dirty litter box cause a cat to spend more time in it?

Yes. A cat may linger in an unclean box out of anxiety or discomfort, or may avoid it entirely and eliminate elsewhere. Clean the box at least once daily, and consider adding a second box if you have multiple cats or if the current box is in a stressful location.

My older cat suddenly started spending a lot of time in the litter box. Should I be worried?

A sudden change in litter box behavior in an older cat often signals a medical issue like kidney disease, diabetes, or hyperthyroidism. Schedule a vet visit and mention the change. Bloodwork can help identify the cause.

What if my cat is lying in the litter box but seems otherwise fine?

Even if your cat appears healthy, lying in the litter box is not normal behavior and usually indicates something is off—mild illness, stress, or discomfort you cannot see. A vet visit can help identify the cause before it becomes a bigger problem.