Cats cough far less often than dogs or humans, so when your cat starts coughing, it usually signals something worth paying attention to. The most common cause is feline asthma or chronic bronchitis, but infections, parasites, and even heartworms can be behind it. The first step is figuring out whether your cat is actually coughing or just trying to bring up a hairball, because the two look surprisingly similar.
Coughing vs. Hairballs: How to Tell
Many cat owners mistake a true cough for a hairball attempt, and vice versa. The difference matters because a hairball is a grooming issue while a persistent cough points to the lungs or airways. Here’s how to distinguish them:
A coughing cat typically crouches low to the ground, extends its neck forward, and produces a dry, wheezy, or raspy sound. It looks like effort, but nothing comes up. The sound is harsh and repetitive, similar to a human with a tickle in the throat. A hairball episode, on the other hand, involves deep rhythmic hacking, gagging, retching, and wet gurgling sounds. Your cat may arch its back or hunch with its head low, and the episode usually ends with something being expelled.
If you hear repeated dry hacking without any visible hairball afterward, you’re likely dealing with a cough. Recording a video on your phone is genuinely helpful for your vet, since cats rarely cough on cue during an exam.
Feline Asthma and Chronic Bronchitis
Asthma is the single most common reason cats develop a chronic cough. It works much like asthma in people: the immune system overreacts to an inhaled trigger, producing inflammation that narrows the airways and makes breathing harder. Over time, this cycle of inflammation can permanently remodel the airway walls, which is why early treatment matters.
Asthma episodes range from mild (occasional dry cough, slight wheeze) to severe (labored breathing, open-mouth panting). Some cats cough only seasonally or in response to specific triggers, while others have symptoms year-round. Chronic bronchitis looks very similar but involves ongoing inflammation without the same allergic immune trigger.
Common household irritants that can set off or worsen feline airway disease include cigarette smoke, wood stove or fireplace smoke, aerosol sprays (air fresheners, cleaning products, perfumes), scented or dusty cat litter, and powders. If your cat has been diagnosed with asthma, reducing exposure to these irritants is a core part of management alongside medication.
Treatment usually involves anti-inflammatory drugs to reduce swelling in the airways and bronchodilators to open them up during flare-ups. Many cats do well with inhaled medications delivered through a specially designed feline spacer, a small chamber that attaches to a metered-dose inhaler and fits over the cat’s nose and mouth. Inhaled treatment targets the lungs directly and tends to cause fewer side effects than oral medication.
Respiratory Infections
Viral, bacterial, and fungal infections can all cause coughing. Upper respiratory infections (the feline equivalent of a cold) more commonly cause sneezing, nasal discharge, and watery eyes, but when infection spreads deeper into the lower airways or lungs, coughing develops. Bacterial pneumonia, while less common in cats than dogs, produces a wet-sounding cough often accompanied by fever, lethargy, and loss of appetite.
Bordetella and mycoplasma are two bacterial agents that occasionally cause lower airway disease in cats, particularly in shelters or multi-cat households where close contact makes transmission easy.
Heartworm-Associated Respiratory Disease
Heartworm isn’t just a dog problem. When immature heartworms reach the small arteries in a cat’s lungs, they trigger severe inflammation that damages not only the blood vessels but also the tiny airways and air sacs where oxygen exchange happens. This condition, known as heartworm-associated respiratory disease (HARD), causes intermittent coughing, wheezing, rapid or difficult breathing, and gagging that looks almost identical to asthma.
Cats can develop HARD even from a very small number of worms, and because the symptoms overlap so heavily with asthma, it’s easy to misdiagnose. Other signs include vomiting, weight loss, and lethargy. Indoor cats are not immune since mosquitoes, which transmit heartworm, get inside homes. Monthly heartworm prevention is the most effective way to avoid this entirely.
Lungworm Infections
Cats that hunt or spend time outdoors can pick up lungworm, most commonly a species called Aelurostrongylus abstrusus. Cats become infected by eating slugs, snails, or prey animals (like birds or rodents) that carry the parasite’s larvae. The larvae migrate to the lungs, where they mature and cause inflammation, coughing, and sometimes breathing difficulty.
Lungworm is diagnosed by identifying larvae in a stool sample, though standard fecal tests can miss them. A specialized technique called a Baermann test, which uses warm water to coax larvae out of a fresh fecal sample, is more reliable. Treatment with appropriate anti-parasitic medication is usually effective.
Heart Disease: Less Common Than You’d Think
If you’ve heard that coughing signals heart problems, that’s largely a dog rule. Coughing is a hallmark of congestive heart failure in dogs because fluid accumulates around the lungs. In cats, heart disease rarely produces coughing as a primary symptom. Cats with heart failure are more likely to show rapid breathing, reduced activity, or hiding. A vet may still check for heart disease during a cough workup, but it’s low on the list of likely causes.
Lung Tumors
Cancer in the lungs or airways is an uncommon but serious cause of coughing, particularly in older cats. It can be a primary lung tumor or cancer that has spread from elsewhere in the body. A persistent cough in a senior cat that doesn’t respond to standard asthma or infection treatment warrants further investigation with chest imaging.
What Happens at the Vet
Because coughing is a nonspecific symptom with a wide range of possible causes, your vet will typically start with a physical exam (listening to the lungs and heart with a stethoscope) and chest X-rays. X-rays can reveal the characteristic bright, branching airway pattern of asthma, fluid or masses in the lungs, or an enlarged heart. Bloodwork helps identify infection or an elevated count of certain white blood cells associated with allergic inflammation or parasites. A fecal exam checks for lungworm larvae. If heartworm is a possibility in your region, specific blood testing can screen for it.
In cases where the diagnosis remains unclear, more advanced steps might include collecting a sample of airway fluid through a procedure called a bronchoalveolar lavage, or a fine-needle lung aspirate guided by imaging. These tests let the vet examine cells from the airways directly to pinpoint infection, inflammation, or cancer.
Signs That Need Immediate Attention
Most coughing cats are stable enough to wait for a scheduled vet appointment, but certain signs indicate a respiratory emergency. Open-mouth breathing in a cat is never normal and always warrants urgent care. Other red flags include blue or pale gums, rapid continuous panting, standing with elbows splayed outward and neck stretched, exaggerated belly movement with each breath, inability to settle or visible distress, and collapse. These signs mean your cat is struggling to get enough oxygen and needs help right away.