When your cat crouches down, extends their neck, and makes that harsh hacking sound but nothing comes up, you’re probably not watching a failed hairball attempt. You’re likely watching your cat cough. The two look remarkably similar, which is why so many cat owners wait for a hairball that never arrives. But coughing in cats is its own symptom with its own set of causes, and some of them need veterinary attention.
Coughing vs. Hairball: How to Tell the Difference
Both coughing and hairball episodes involve your cat crouching low with their neck stretched out, which is why they’re so easy to confuse. But the sounds and outcomes are different. During a hairball episode, your cat will arch their back or crouch with their head low and make rhythmic retching sounds, often wet or gurgling. The abdominal muscles contract visibly, and the episode usually ends with something coming up, whether that’s a hairball, bile, or food.
A coughing cat also crouches low and extends their neck, but produces repeated wheezing or raspy sounds with nothing coming up afterward. Cats who are coughing may stay hunched over longer, appear uncomfortable, and sometimes avoid eating or playing. If your cat has been doing this repeatedly and the floor is always clean afterward, coughing is the more likely explanation.
Feline Asthma Is the Most Common Cause
Asthma affects a significant number of cats and is one of the first things veterinarians consider when a cat has a chronic dry cough. The condition works much like human asthma: the airways overreact to inhaled allergens, causing inflammation, excess mucus production, and tightening of the muscles around the airways. This narrows the breathing passages and triggers coughing or wheezing episodes.
Cats with asthma can show a wide range of symptoms. Some have only an occasional cough that’s easy to dismiss. Others experience episodes of genuine breathing difficulty that can be life-threatening. Between episodes, your cat may seem completely normal, which makes it tempting to write the coughing off as nothing. But asthma tends to worsen over time without treatment, and a cat that’s wheezing mildly today could have a serious breathing crisis later.
Common household triggers include cleaning products, scented candles, air fresheners, cigarette smoke, dust from certain cat litters (especially clay-based), and dander from other pets. If you notice your cat’s hacking episodes happen after you clean the house or light a candle, an environmental irritant is a strong possibility. Switching to unscented, dust-free litter and removing aerosolized fragrances from your home can sometimes reduce episodes noticeably.
Asthma is typically managed with anti-inflammatory medications, often delivered through a specially designed inhaler with a feline face mask. Inhaled medications target the lungs directly and tend to cause fewer side effects than oral options. Many cats tolerate the inhaler well once they’re used to it, and owners often see a significant reduction in coughing episodes within a few weeks.
Heartworm Disease Looks Different in Cats
Most people associate heartworm with dogs, but cats are also vulnerable, and the disease presents very differently in them. In cats, even immature heartworms that never fully develop can trigger an intense inflammatory reaction in the lungs called heartworm-associated respiratory disease, or HARD. The worms arrive in the pulmonary system around 70 to 90 days after a mosquito bite and can cause significant lung inflammation even if they die before reaching adulthood.
This makes HARD particularly tricky. A cat can test negative for adult heartworms on standard tests while still having real lung damage from the initial infection. Lung changes from a single infection have been documented persisting for 18 months or longer, even after the cat’s blood tests return to normal. The coughing and breathing difficulty it causes can look identical to asthma on an X-ray, which is why vets sometimes investigate heartworm as a possibility even in indoor cats (mosquitoes get inside).
Lungworm and Other Parasites
Cats who hunt or spend time outdoors face an additional risk: lungworm. These parasites have a complex life cycle involving slugs, snails, and the small animals that eat them, like mice, lizards, frogs, and birds. When a cat eats an infected prey animal, larvae migrate to the respiratory tract, mature, and lay eggs. The larvae that hatch are coughed up, swallowed, and passed in feces, completing the cycle.
Even indoor cats aren’t entirely safe. Kittens can be infected through their mother’s milk, and environmental contamination from snail mucus trails has been documented as a possible transmission route. Lungworm infections cause coughing that can easily be mistaken for asthma. Your vet can check for lungworm larvae through a fecal test, though the most reliable method requires a specialized sample preparation that takes about 24 hours.
What Vets Look For
If the coughing has been going on for more than a week or two, or if it’s getting more frequent, your vet will likely start with chest X-rays. These can reveal patterns of inflammation, fluid, or changes in the airways and blood vessels that help narrow down the cause. Asthma, heartworm disease, and lungworm infections each leave somewhat different signatures on imaging, though there’s overlap.
Beyond X-rays, your vet may recommend a fecal exam to rule out lungworm, blood tests for heartworm antibodies, or a procedure that collects fluid from the airways for analysis. The airway fluid can be checked for infection, inflammatory cells, and specific pathogens. This layered approach matters because asthma is a diagnosis of exclusion. Your vet needs to rule out infections and parasites before settling on it.
Heart Disease Rarely Causes Coughing in Cats
Here’s something that surprises many owners: unlike dogs, cats with heart disease rarely cough. When a cat’s heart begins to fail, the primary signs are faster breathing (especially while resting or sleeping), decreased activity, and eventually labored breathing. Coughing is not a reliable indicator of heart problems in cats the way it is in dogs. So if your cat is hacking without a hairball, heart disease is lower on the list of likely causes, though your vet may still check for it during workup.
Signs That Need Immediate Attention
Most coughing in cats warrants a vet visit but not a rush to the emergency room. There are exceptions. Open-mouth breathing in a cat is never normal and always constitutes an emergency. Cats are obligate nose-breathers, so if your cat is panting or breathing with their mouth open while at rest, something is seriously wrong. Other red flags include breathing faster than 40 breaths per minute while resting, blue or grey gums or tongue, and visible effort with each breath where the belly pumps in and out. Any of these signs mean your cat is in respiratory distress and needs emergency care right away.
For the more common scenario, where your cat hacks a few times a day or a few times a week and otherwise seems fine, schedule a regular vet appointment. Bring a video of the episodes if you can. Vets find these incredibly helpful because cats have a talent for acting perfectly healthy the moment they enter a clinic. A 30-second phone recording of the hacking can help your vet distinguish coughing from retching and start the diagnostic process faster.