Short answer
The best-supported benefit of having a cat is short-term calm: in a randomized trial of 249 university students, 10 minutes of petting cats and dogs lowered salivary cortisol compared with watching, looking at photos or waiting (1). Long-term benefits are less certain. In a US study that followed 4,435 adults for 20 years, people who had ever owned a cat had a lower risk of dying from a heart attack (relative risk 0.63), but the study was observational and cannot show the cat caused it (2). Reviews of pets and mental health are mixed, and one 2025 meta-analysis linked cat ownership with a slightly higher risk of depression (4).
Purring is real low-frequency vibration — domestic cats purr at roughly 25 to 30 Hz (8) — but the popular idea that purring heals human bones is a hypothesis built on that frequency, not a finding from studies of people.
If a cat on your lap makes a hard evening feel lighter, you're not imagining it. The calm is real; it just shows up as a quieter moment rather than a medical result.
Note: This article is general information, not medical or veterinary advice. If you are pregnant or have a weakened immune system, ask your clinician about cat care and toxoplasmosis (12). If you are in crisis, call or text 988 in the US (21). This guide is published by Welltory, which makes one of the apps mentioned.
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What are the benefits of having a cat?
Here are the benefits of owning a cat, sorted by how strong the evidence is.
Better supported:
Calm in the moment. Hands-on petting of cats and dogs lowered cortisol in a randomized trial (1). CDC says cats "can provide emotional support, improve moods" (12).
Company with a lighter workload than a dog. No walks, a lower budget (about $1,149 a year vs about $1,391 for a dog, in the ASPCA's 2021 estimate) (15), and fewer fall injuries: cats were involved in 11.7% of pet-related falls in a CDC analysis, dogs in 88% (16).
Plausible, but observational:
Heart health. Past cat ownership was linked with lower risk of death from heart attack in one US cohort (2). Pooled analyses of pet ownership are mixed (3).
Social contact for some groups. CDC credits cats with "promoting socialization among older people and physically or mentally disabled people" (12).
Unclear or mixed:
Anxiety and depression. Some studies show benefits, many show none, and a few show the opposite (4, 5).
Healing from purring. Not tested in people (8).
What happens in your body when you pet a cat
Most body measurements in human–animal research come from dog studies, so it is worth being clear about what applies to cats.
Cortisol. The Pendry trial included both cats and dogs. Students who petted the animals for 10 minutes had lower cortisol at the end than those who watched, saw photos or waited, after accounting for each person's morning cortisol (1). The authors call this "momentary stress relief."
Heart rate and blood pressure. A 2012 review of human–animal interaction studies concluded that friendly animals can reduce heart rate and blood pressure or buffer their rise during stress, with oxytocin as a proposed — not proven — mechanism (19). The most recent meta-analysis on stress reactivity looked only at dogs and found small effects (18). Cat-specific data are thin.
Breathing and attention. A purring cat has a slow, steady rhythm and asks for nothing. Many people find their own breathing slows to match. That is a reasonable explanation for the "calm lap" effect, though it has not been measured well in cats.
What is not supported: that owning a cat lowers your baseline stress hormones or blood pressure over months. NIH sums up the field honestly: "Some studies have shown positive health effects, but the results have been mixed" (17).
Cats and heart health: what the big studies show
The cat-and-heart headline comes mostly from one study. Qureshi and colleagues analyzed 4,435 adults from the US National Health and Nutrition Examination Survey, 55% of whom had owned a cat, and followed them for 20 years. Past cat owners had a lower risk of death from heart attack (RR 0.63; 95% CI 0.44–0.88). For death from any cardiovascular disease, including stroke, the result was only a trend (RR 0.74; 95% CI 0.55–1.0) (2).
A 2019 meta-analysis of 12 studies and nearly 489,000 people found that, after adjustment, pet ownership overall was not linked with all-cause mortality or heart disease risk, with a small benefit for cardiovascular death in the general population (3). The American Heart Association's 2013 statement concluded that pet ownership, particularly dog ownership, is probably associated with lower cardiovascular risk (20).
How to read this: cat owners may differ from non-owners in calmer temperaments, steadier homes or other habits that studies cannot fully adjust for. A cat is lovely company for your heart, but it is not a substitute for blood pressure checks, movement and not smoking.
Cat purring and healing: what the frequency claim is based on
This is the most-searched cat health question, so here is the full story.
How cats purr
Researchers measured purring in unrestrained domestic cats at about 26.3 Hz on average, with each cat's frequency staying stable as it aged (9). For decades, the purr was thought to need constant nerve signals driving the larynx muscles 20 to 30 times a second. In 2023, a study in Current Biology showed that excised cat larynges could produce self-sustained vibration "with fundamental frequencies of 25 to 30 Hz without neural input," helped by small pads of connective tissue in the vocal folds (8). In other words, the purr is a built-in, very low-pitched voice.
Where the healing idea comes from
The theory goes like this: low-frequency vibration may stimulate bone and soft tissue; purrs are low-frequency vibration; therefore purring may help cats heal — and maybe people too. It is an attractive idea, and it explains why cats sometimes purr when injured.
What the evidence does and does not show
The healing effect in people has not been tested. The claim is an extrapolation from frequency, not a result from studies of humans with purring cats on a fracture or a sore back.
Cats purr in many states. A veterinary behaviorist at NC State notes cats purr to maintain contact, when content on a familiar lap, just before sleep, and also when in pain — vets have seen it in cats brought in after being hit by a car (10).
So, do cat purrs heal bones? There is no evidence that they heal yours. Do they make you feel better while you heal? For many people, yes — and that is worth something on its own.
What does cat purring mean?
Purring usually means a cat is relaxed and seeking contact, but not always. Cats also purr just before sleep and sometimes when hurt or unwell (10). Read the purr together with the rest of the cat: a loose body, slow blinks and kneading suggest comfort; hiding, not eating, a hunched posture or purring with obvious pain mean it is time to call your vet.
Are cats good for mental health and anxiety?
Sometimes, for some people — and the research is more sobering than most articles admit.
A 2021 review of 54 studies found pet ownership had a positive impact on mental health in 17, mixed in 19, none in 13 and negative in 5 (5).
A 2025 meta-analysis of 21 studies (159,322 people) found no overall link between pet ownership and depression, but cat ownership was linked with a modestly higher risk (OR 1.06) (4). That is an association: people who are already struggling may be more likely to choose a cat, which asks for less energy than a dog.
During the COVID-19 pandemic, a study following 4,237 people found dog owners showed larger drops in stress and loneliness than cat owners and non-owners, but after adjusting for confounders, pet ownership did not ease stress (6).
In a 2025 study of 600 young UK adults with anxiety or low mood, dog owners reported more secure attachment to their pets than cat owners, and links between pet behavior problems and owner mental health were found for dog owners but not replicated for cat owners (7).
None of this means cats are bad for your mood. It means the effect depends on the person, the cat and the reason the cat arrived. A cat can be steady company through anxiety; it is not a treatment for an anxiety disorder or depression (22).
Best cats for anxiety
There is no research ranking cat breeds for anxious owners. What matters is the individual cat: an adult cat whose temperament you have seen — relaxed with handling, not fearful of noise, happy to sit near people — is a safer choice than a kitten of any breed. Kittens are playful and into everything, which is fun but not restful.
Sleeping with your cat: good or bad?
It depends on the cat and on you. In a survey of about 1,000 US women, cats in bed were rated as disruptive as human partners, and gave a weaker sense of comfort and security than either dogs or human partners; dogs' sleep cycles more closely match ours (11).
Practical rules:
If you sleep well with your cat, keep doing it.
If you wake often, close the bedroom door for two weeks and compare your sleep.
If you have allergies or asthma, keep the bedroom cat-free. Cat allergens are "especially sticky" and can cause symptoms up to 6 months after the animal is gone (14).
Wash hands after the litter box. CDC says pregnant women and people with weakened immune systems face a higher risk from cat-spread germs (12).
If shared sleep is a struggle in general, our piece on sleep divorce covers the trade-offs of sleeping apart.
Cats vs dogs for stress: how they differ
| | Cats | Dogs |
|---|---|---|
| Daily time | Feeding, litter, play | Several walks a day, plus play |
| Physical activity for you | Little | Dog owners had 4× the odds of meeting the 150-minute guideline (24) |
| Yearly cost (ASPCA 2021) | About $1,149 | About $1,391 (15) |
| Share of pet-related falls (CDC) | 11.7% | 88% (16) |
| Being alone during the day | Usually fine | Often hard |
| Research on stress | Thin | More, but still mixed |
Checked November 10, 2026.
If what you need most is movement, daylight and a fixed schedule, a dog pushes you there; see our guide to how many steps a day you need. If what you need is quiet company that does not add pressure, a cat may fit better.
The downsides of having a cat
Allergies. Cat and dog allergies affect 10 to 20% of people worldwide, and "a truly non-allergic dog or cat does not exist" (14). A pet allergy can trigger asthma attacks in people with asthma. Allergies can also leave you tired; see can allergies make you tired.
Infections. Cat bites and scratches can spread germs even when they look minor, and cat scratch disease can follow a shallow scratch (12). For toxoplasmosis, CDC advises changing the litter box daily because the parasite does not become infectious until 1 to 5 days after it is shed (13). Pregnant women and people with weakened immune systems should avoid cleaning litter boxes if possible (12).
Falls. Most pet-related falls involve dogs, but two-thirds of cat-related falls come from tripping over the cat (16) — a real issue for older adults at night.
Cost and time. About $1,904 in the first year in the ASPCA's estimate (15), plus vet emergencies, for the whole of the cat's life.
Worry and grief. An ill cat is real stress, and losing one is real grief. A review of people living with mental health conditions named both the burden of care and "the psychological impact that losing a pet has" (23). Our article on grief and the body describes what that does to sleep and heart rate.
Is a cat right for you right now? A short checklist
Allergies tested? Spend time with cats, or foster first, before you commit (14).
Budget checked? Plan for food, litter, vet care and emergencies for the cat's whole life.
Adult or kitten? For calm, an adult cat whose temperament you have seen.
Pregnancy or immune issues at home? Plan who will clean the litter box (12).
Night-time trips? Keep floors clear and use a night light to avoid tripping.
Why now? If you are getting a cat to fill a hard stretch, that is human — just keep other support in place too.
Living with a cat and stress: the questions people ask next
Do cats help with anxiety?
Cats can ease anxious moments: petting cats and dogs lowered cortisol after 10 minutes in a randomized trial (1). But reviews of pet ownership and mental health are mixed (5), and a cat does not treat an anxiety disorder. Think of a cat as company that can make anxious evenings easier, alongside proper care.
Are cat purrs good for you?
Listening to and feeling a purr is pleasant and calming for many people, and purrs are genuine low-frequency vibration at about 25 to 30 Hz (8). Claims that purring heals human bones or lowers blood pressure have not been tested in people. Enjoy the purr; do not rely on it for healing.
Do cats help with depression?
Not reliably. A 2025 meta-analysis of 21 studies found no overall link between pet ownership and depression and a slightly higher risk among cat owners (OR 1.06), which likely reflects who chooses cats rather than harm (4). A cat can be good company in low moods, but depression needs its own care.
Why do I feel calmer with a cat on my lap?
Warmth, gentle weight, a slow rhythm and an animal that wants nothing from you can all help your nervous system settle. Human–animal interaction studies show friendly animals can buffer heart-rate and blood-pressure rises in stressful moments (19). Cat-specific measurements are limited, but the feeling is consistent with what is known.
Is it bad to sleep with your cat?
Not for everyone. Women in one survey rated cats about as disruptive in bed as human partners (11). If you have allergies, asthma, a weakened immune system or broken sleep, keep the cat out of the bedroom and compare your sleep over two weeks.
Before you blame yourself
If you got a cat and still feel stressed, you might think, "Everyone says cats are calming — what's wrong with me?" Before you blame yourself, check what your body already recorded. Maybe your sleep is broken by 5 a.m. paws on your face. Maybe a sniffly nose and tiredness started when the cat arrived. Maybe your calmest evenings are the ones with 15 minutes of quiet on the sofa with the cat and no phone.
Pick one lever and keep it for 2 weeks: for example, a closed bedroom door at night, or a set 15-minute screen-free sit with your cat in the evening. Then compare your sleep and stress readings with the 2 weeks before. One change, one trend — and an honest answer about what your cat does for you.
When to see a doctor
See a doctor if:
you have sneezing, itchy eyes, hives, wheezing or shortness of breath around cats — a pet allergy can trigger asthma attacks (14);
a cat bite or scratch becomes red, swollen or painful — CDC notes bites and scratches can spread germs even when they look minor (12);
you are pregnant or immunocompromised and have questions about toxoplasmosis (13);
anxiety or low mood lasts for weeks and interferes with daily life (22);
grief after losing a cat is not easing, or you cannot function.
If you are thinking about harming yourself, call or text 988, or chat at chat.988lifeline.org (21).
How to bring this up with your doctor
For allergy: "My symptoms started or got worse after we got a cat. Could this be a cat allergy, and is testing worth it?"
For pregnancy: "We have a cat. What should I change about litter and hygiene while I'm pregnant?"
For mood: "My cat helps, but I still feel anxious or low most days. What are my options?"
Bring 2–4 weeks of notes: sleep, symptoms, when they happen, and anything that changed at home.
If you feel dismissed, say: "This affects my sleep and my work. I'd like a plan or a referral."
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How Welltory helps — and what it cannot do
What it cannot do. Welltory is a general wellness product, not a medical device. It does not diagnose allergies, anxiety or depression, and it does not measure anything about your cat or its purr.
What it can do is help you see how your evenings, nights and stress patterns look on your own data:
A quick heart rate and HRV reading with your phone camera. It is a spot reading, not continuous monitoring. Try one before and after 15 quiet minutes with your cat on a few evenings, following the camera measurement guide and the tips for accurate HRV readings.
Tag what happened. On iPhone with an Apple Watch or Oura ring, the Today screen shows stress and recovery through the day. When Welltory spots an episode, it asks "What happened?" or "What helped you rest?" — tap a tag, type or talk: "cat on my lap," "woken at 5 by the cat," "sneezing all evening."
Look back at patterns. On iOS, My Patterns starts showing which tags come with stress and which with recovery once you have about 7 tagged events; month-to-month comparison needs a paid plan.
Sleep and resting heart rate from your watch or ring. Connect Apple Health, Health Connect or Samsung Health to compare nights with the bedroom door open and closed.
A log for your doctor. Export your data as a CSV file from the web app and bring it to your appointment.
Patterns are links to discuss with your doctor, not proof that your cat caused a change.
How we made it
We based this article on a randomized trial in AERA Open, cohort studies and meta-analyses in the Journal of Vascular and Interventional Neurology, PLOS ONE and Annals of General Psychiatry, studies of purring in Current Biology and the Journal of Zoology, and guidance from CDC, NIH, the ASPCA, the Asthma and Allergy Foundation of America and the NC State College of Veterinary Medicine. Every number was checked against the source we cite on November 10, 2026. Search questions came from what people in the United States most often ask about the benefits of having a cat and cat purring. For the product section, we checked every function against the Welltory Help Center on November 10, 2026.
Made with AI tools, then edited and fact-checked by the Welltory team. See our Editorial & AI policy.
Jane Smorodnikova, co-founder of Welltory, built the methodology behind how we read physiological data.
Written by Tatsiana Yashyna.
Discounts for blog readers: up to 36% off
See what affects your energy, stress, sleep, and daily state with Welltory
This article is for educational purposes only and is not medical advice. If you are pregnant or have a weakened immune system, ask your clinician about cat care and toxoplasmosis. If you are in crisis, call or text 988 in the US. This guide is published by Welltory, which makes one of the apps mentioned. Welltory is a general wellness product: it helps you track and understand your data and does not diagnose or treat any condition. Sources were retrieved on November 10, 2026.
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Written by Jane Smorodnikova
The founder and CEO of Welltory. A recognized tech leader with two Master's degrees and experience at MIT, she has scaled Welltory to over 17 million users.
Written by Tatsiana Yashyna
Deputy COO at Welltory. With a background in medicine and years of working with health data, she translates research and real physiological signals — sleep, stress, heart rate, and hormones — into clear, evidence-based explanations that help people understand what their bodies are telling them.
References
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- Welltory Help Center — How to export data from Welltory. https://help.welltory.com/en/articles/3368391-how-to-export-data-from-welltory