Cats cough for many of the same reasons humans do: something is irritating their airways. But because cats are so good at hiding discomfort, a cough that seems minor can sometimes signal asthma, infection, or parasites. The first step is figuring out whether what you’re hearing is actually a cough, since cats make several sounds that are easy to confuse.
Coughing vs. Hairballs: How to Tell the Difference
Many cat owners mistake coughing for hairball retching, and vice versa. The distinction matters because the causes and treatments are completely different. A coughing cat crouches low, extends the neck forward, and produces repeated dry, raspy, or wheezy sounds. Nothing comes up. The cat may stay hunched over for several seconds, looking uncomfortable, sometimes with the mouth open. It can sound like a person with a persistent tickle in their throat.
A hairball episode looks similar at first glance, but the sound is wet and gag-like. Your cat will arch the back or crouch with the head low and make rhythmic retching motions that end with something being expelled. If the episode produces a tubular clump of hair or a small amount of fluid, that’s a hairball. If your cat goes through these motions repeatedly without bringing anything up, it may actually be coughing, not dry-heaving. Veterinarians note that owners frequently bring cats in for what they believe are failed hairball attempts, only to discover the cat has been coughing all along.
Feline Asthma
Asthma is one of the most common reasons cats develop a chronic cough. The classic pattern is episodic bouts of coughing and wheezing, sometimes with a noticeably faster breathing rate or visible effort when exhaling. Some cats push their abdomen visibly with each breath, which vets call an abdominal “push.” Between episodes, the cat may seem perfectly normal.
A wide range of household irritants can trigger flare-ups: tobacco smoke, dusty cat litter, vapors from cleaning products or aerosol sprays, candle or fireplace smoke, pollen, mold, dust mites, and occasionally certain foods. In most cases, the specific trigger is never pinpointed, but reducing airborne irritants in your home can make a real difference. Switching to a low-dust litter and avoiding aerosol sprays or heavy fragrances near your cat are two of the simplest changes to try.
If your vet suspects asthma, chest X-rays are typically the first diagnostic step. These may show a pattern of thickened airways, though in some stable asthmatic cats the X-rays look completely normal. Treatment usually involves a corticosteroid to reduce airway inflammation. This can be given orally, but many cats do well with an inhaled version delivered through a small spacer device and face mask designed for cats. You hold the mask gently over the cat’s face for about seven to ten breaths after each puff. It takes a little training, but most cats tolerate it. Inhaled treatment has the advantage of delivering medication directly to the lungs with fewer side effects throughout the rest of the body.
Respiratory Infections
Upper respiratory infections are extremely common in cats, especially those adopted from shelters or living in multi-cat households. Several viruses and bacteria are responsible. Feline herpesvirus and feline calicivirus are the two most prevalent viral culprits, causing sneezing, nasal congestion, eye discharge, and sometimes coughing. Calicivirus is particularly widespread: up to 90% of cats in crowded environments like shelters may carry it. In some cases the infection spreads to the lower airways and causes pneumonia.
On the bacterial side, Bordetella and Chlamydia are common offenders. About 5% of cats showing respiratory symptoms in shelters harbor Bordetella, which can cause anything from mild coughing and sneezing to serious breathing difficulty. Chlamydia tends to focus on the eyes, causing conjunctivitis, but is found in roughly 20% of cats with upper respiratory signs.
Most mild respiratory infections clear up on their own within one to three weeks, though your vet may prescribe supportive care or antibiotics if a bacterial component is suspected. A cat that stops eating, develops thick colored discharge from the nose or eyes, or seems lethargic warrants a vet visit sooner rather than later.
Heartworm-Associated Respiratory Disease
Heartworm disease in cats looks very different from the version dogs get. Cats are not the parasite’s ideal host, so the worms often die before reaching adulthood. But even immature heartworms can trigger a severe inflammatory reaction in the lungs called heartworm-associated respiratory disease, or HARD. This inflammation affects the airways, lung tissue, and the small arteries in the lungs, producing coughing and breathing difficulty that can look identical to asthma on X-rays.
The tricky part is that standard heartworm tests designed for dogs are less reliable in cats. Your vet may need a combination of blood tests, X-rays, and sometimes ultrasound to investigate. The lung damage from HARD can persist long after the worms themselves are gone, with chronic scarring that restricts normal lung function. Monthly heartworm prevention is effective in cats and is worth discussing with your vet, even for indoor cats, since mosquitoes can easily get inside.
Less Common Causes
Fungal infections occasionally cause coughing in cats. The most common fungal culprit is Cryptococcus, though Histoplasma and Blastomyces can also affect the lungs, particularly in certain geographic regions. These infections tend to develop slowly and may be accompanied by weight loss or nasal discharge.
Foreign bodies, polyps in the airway, and lung tumors are rarer causes but worth considering if coughing persists despite treatment or if it develops suddenly in an older cat. One thing that surprises many owners: unlike in dogs, heart disease almost never causes coughing in cats. If your cat is coughing, the problem is almost certainly in the airways or lungs, not the heart.
Signs That Need Urgent Attention
An occasional cough in an otherwise healthy cat is worth monitoring and mentioning at your next vet appointment. But certain signs indicate your cat is struggling to breathe and needs emergency care. Open-mouth breathing in a cat is always an emergency, as cats normally breathe exclusively through the nose. Other urgent signs include rapid or continuous panting, blue-tinged gums, standing with the elbows pointed outward and neck stretched forward, exaggerated chest or belly movements with each breath, inability to settle or rest, and collapse. These indicate your cat’s oxygen supply is compromised, and waiting even a few hours can be dangerous.
A cough that happens more than a couple of times a week, lasts longer than two to three weeks, or is getting progressively worse also warrants a veterinary evaluation. Chest X-rays can distinguish between asthma, infection, heartworm disease, and other causes, which means treatment can be targeted rather than guesswork.