A coughing kitten is not normal. Unlike dogs, cats rarely cough without an underlying reason, so even occasional coughing in a kitten is worth paying attention to. The cause could be something as simple as dusty litter irritating your kitten’s airways or as serious as a respiratory infection picked up from a shelter. Understanding what the cough looks like, what’s behind it, and when it needs veterinary attention will help you respond quickly.
Coughing vs. Hairballs: How to Tell the Difference
Before assuming your kitten has a cough, make sure you’re not watching a hairball attempt. The two look similar but have distinct differences. A true cough sounds dry and harsh, similar to a person with a tickle in their throat. Your kitten will crouch low and extend their neck, producing repeated wheezing or raspy sounds. The key detail: nothing comes up. Cats rarely expel anything after a genuine cough.
A hairball, on the other hand, involves a deep, rhythmic hacking followed by gagging, retching, or wet gurgling sounds. Your kitten will hunch down with their neck stretched out, and after several attempts, they’ll typically produce a tubular clump of hair along with some stomach fluid. If something comes up, it’s probably a hairball. If nothing does, and the episodes keep repeating, you’re dealing with a cough.
Upper Respiratory Infections
The most common reason kittens cough is an upper respiratory infection, especially if your kitten recently came from a shelter, breeder, or any environment with multiple cats. These infections are caused by a handful of highly contagious viruses and bacteria that spread through close contact.
Feline herpesvirus is the most widespread culprit. Up to 97% of cats are exposed to it during their lifetime, and in up to 80% of those cats, the virus establishes a lifelong infection that can flare up during stress. It causes sneezing, nasal discharge, fever, and sometimes eye ulcers. Feline calicivirus is another major cause, producing similar upper respiratory signs but occasionally progressing into pneumonia or causing mouth ulcers.
Bacterial infections matter too. Bordetella, the same family of bacteria behind kennel cough in dogs, affects cats in crowded living situations like shelters and catteries. About 5% of cats showing respiratory symptoms in these settings carry Bordetella. Symptoms range from mild coughing and sneezing to severe breathing difficulty. Chlamydia felis, another bacterium, tends to target the eyes more than the lungs, causing conjunctivitis with discharge that starts clear and turns yellowish over time.
Most respiratory infections in kittens come with a package of symptoms beyond coughing: sneezing, runny nose, watery or goopy eyes, reduced appetite, and lethargy. If your kitten has several of these together, an infection is the likely explanation.
Parasites That Affect the Lungs
Kittens who spend time outdoors or hunt can pick up lungworms, parasites that settle in the airways and cause persistent coughing. The most common species in cats is transmitted through an indirect route: a kitten eats a bird or rodent that previously ate a slug or snail carrying the parasite larvae. The worms then take up residence in the lower respiratory tract, causing bronchitis or pneumonia.
Signs range from moderate coughing with a slightly faster breathing rate to severe, persistent coughing and labored breathing. Deaths from lungworm are uncommon overall but do occur in kittens, whose smaller airways and developing immune systems make them more vulnerable.
Standard kitten deworming protocols target roundworms and hookworms but not necessarily lungworms, so if your kitten has a cough that isn’t responding to typical treatments and has had any outdoor or prey exposure, mention this to your vet.
Feline Asthma
Asthma in cats works much like it does in humans. Inhaled allergens trigger an immune reaction that inflames and constricts the airways, making it hard to breathe and causing a characteristic cough. While it’s more commonly diagnosed in adult cats, it can begin in kittenhood.
There’s no single test that confirms feline asthma. Vets piece together the diagnosis from your kitten’s history, chest X-rays, and sometimes microscopic analysis of airway cells. On X-rays, asthmatic cats often show a distinctive bright branching pattern along the airways from accumulated inflammatory cells, and the lungs may appear larger than normal from trapped air.
If your kitten’s cough comes and goes, seems worse in certain rooms or seasons, and isn’t accompanied by fever or nasal discharge, asthma is worth investigating.
Household Irritants That Trigger Coughing
Sometimes the problem isn’t disease but environment. Kittens have small, sensitive airways that react to irritants adult cats might tolerate. Common triggers include dusty cat litter (especially clay-based varieties), cigarette smoke, cleaning products containing bleach or ammonia, plug-in air fresheners, scented candles, and fumes from paint or home renovation projects. All of these release compounds that can irritate a kitten’s lungs and provoke coughing.
If your kitten started coughing after you changed litter brands, used a new cleaning product, or started a home project, try removing the irritant first and see if the cough resolves within a day or two. Switching to a low-dust or paper-based litter is one of the simplest interventions you can make.
Less Common but Serious Causes
Feline infectious peritonitis, or FIP, is a viral disease that disproportionately affects kittens. In its “wet” form, fluid builds up in the chest and abdomen. About one-third of cats with the wet form develop lung involvement and difficulty breathing. FIP typically presents with additional signs like persistent fever, weight loss, and lethargy.
Fluid around the heart or lungs from other causes, including heart disease, can also produce coughing, though this is less common in kittens than in older cats.
When a Cough Becomes an Emergency
A resting or sleeping breathing rate consistently above 30 breaths per minute is abnormal in cats and kittens. You can count this by watching your kitten’s chest rise and fall for 15 seconds, then multiplying by four. If the rate is elevated and your kitten also shows any of the following, treat it as an emergency: open-mouth breathing, blue-tinged gums or tongue, labored breathing where the belly visibly pumps with each breath, or complete refusal to eat or drink.
A single brief coughing episode with an otherwise playful, eating kitten is less urgent, but coughing that persists for more than a day or two, returns frequently, or comes with nasal discharge, eye discharge, or lethargy warrants a vet visit soon rather than later. Kittens can deteriorate quickly because of their small body size and immature immune systems.
What You Can Do at Home
For a kitten with mild congestion from a respiratory infection, humidity can help loosen mucus. Running a hot shower and sitting with your kitten in the steamy bathroom for 10 to 15 minutes, a couple of times a day, can ease breathing. Saline nebulization is another option that some vets recommend. Saline thins mucus and moisturizes the airways, helping your kitten cough up debris. Use veterinary-grade or nebulizer-specific saline, not contact lens solution. A nebulizer is more effective than a simple vaporizer for reaching the lower airways, since vaporized droplets are too large to penetrate deeply into the lungs.
Keep your kitten’s face clean by gently wiping away any nasal or eye discharge with a warm, damp cloth. A congested kitten who can’t smell food often won’t eat, so warming wet food slightly to release its aroma can encourage appetite. Remove any obvious environmental irritants: dusty litter, scented products, aerosol sprays.
Vaccination and Prevention
The core kitten vaccination series protects against both feline herpesvirus and calicivirus, the two biggest causes of respiratory infections. Kittens should start their vaccine series no earlier than 6 weeks of age, with boosters every 3 to 4 weeks until at least 16 weeks old. In high-risk environments like shelters, vaccination may continue to 20 weeks with boosters every 2 to 3 weeks. These vaccines don’t guarantee your kitten will never get a respiratory infection, but they significantly reduce the severity if one occurs.
For parasite prevention, kittens should be dewormed starting at 2 weeks of age, then every 2 weeks until 16 weeks old. This schedule targets the most common intestinal parasites. If your kitten has outdoor access or any history of hunting, discuss broader parasite prevention with your vet that includes coverage for lungworms.