A cat that’s sneezing and coughing most likely has an upper respiratory infection, which is the feline equivalent of a cold. These infections are extremely common, especially in kittens, shelter cats, and multi-cat households. But sneezing and coughing can also point to asthma, environmental irritants, or less common problems like heartworm-associated lung disease. The combination of both symptoms, how long they’ve lasted, and what else is going on will help you figure out how serious the situation is.
Upper Respiratory Infections: The Most Common Cause
The vast majority of sneezing and coughing cats have feline respiratory disease complex, a group of infections caused by a handful of viruses and bacteria. The two biggest culprits are feline herpesvirus and feline calicivirus, often with a bacterial component riding along. Bacteria like Bordetella, Chlamydia, and Mycoplasma can either cause the infection on their own or pile onto a viral infection and make it worse.
These infections spread through direct contact, shared food bowls, and aerosolized droplets from sneezing. A typical case looks like this: your cat starts sneezing, develops watery or thick discharge from the nose and eyes, seems lethargic, and may lose interest in food. Coughing is less constant than sneezing but shows up when drainage irritates the throat. Some cats run a fever, and you might notice swollen lymph nodes under the jaw. Most healthy adult cats recover within 7 to 14 days, though kittens, elderly cats, and cats with weakened immune systems can get seriously ill.
One important thing to know: feline herpesvirus never fully leaves the body. After the initial infection clears, the virus goes dormant and can reactivate during times of stress, causing recurring bouts of sneezing and congestion throughout the cat’s life.
Feline Asthma
If your cat’s coughing is the dominant symptom and comes in episodes where they crouch low to the ground with their neck stretched out, asthma is a real possibility. Roughly 1% of domestic cats in the U.S. have acute or chronic asthma, which translates to about 800,000 cats. During an asthma episode, the airways constrict and fill with inflammatory mucus, triggering fits of coughing, wheezing, and labored breathing.
Asthma episodes can look alarming. Your cat may hack repeatedly as if trying to bring up a hairball but produce nothing. Between episodes, the cat often seems perfectly fine. Asthma is a chronic condition that requires ongoing management, typically with inhaled or oral medications that reduce airway inflammation. A veterinarian diagnoses it through chest X-rays and by ruling out other causes, though imaging results can sometimes look normal even in asthmatic cats.
Indoor Air Quality Matters More Than You Think
Cats are sensitive to airborne irritants, and poor indoor air quality can trigger or worsen respiratory symptoms. Research on pets and household air pollution found that cats living in homes with elevated fine particulate matter (PM2.5 above 35 micrograms per cubic meter) were four times more likely to have respiratory disease than cats in homes with cleaner air.
The most common indoor pollutants that affect cats include secondhand cigarette smoke, cooking fumes, incense, scented candles, aerosol sprays, and strong household cleaners. Dusty cat litter is another frequent irritant. If your cat sneezes more after you clean the house, light a candle, or change the litter, the environment itself may be the problem. Switching to a low-dust, unscented litter and improving ventilation can make a noticeable difference.
Heartworm-Associated Respiratory Disease
This one surprises many cat owners because heartworm is typically associated with dogs. But cats bitten by infected mosquitoes can develop heartworm-associated respiratory disease (HARD), which causes chronic coughing, wheezing, and difficulty breathing. When immature heartworms die inside the cat’s lungs, they trigger an intense inflammatory response that damages the airways and lung tissue.
HARD is tricky to diagnose. Standard heartworm blood tests can come back negative even in infected cats, because the tests are designed to detect adult female worms, and many cats harbor only immature worms or small numbers of males. Ultrasound of the heart can sometimes reveal worms directly, but accuracy depends heavily on the skill of the operator, with detection rates ranging from 40% to 100%. HARD is more common than full adult heartworm infection in cats, which makes it an underdiagnosed problem. Monthly heartworm prevention is the most reliable way to protect against it.
What You Can Do at Home
For a cat with mild sneezing and congestion that’s still eating and drinking normally, a few simple steps can help them feel more comfortable while they recover. Humidity loosens nasal congestion, so bringing your cat into the bathroom while you run a hot shower is one of the easiest remedies. A cool-mist humidifier placed near their resting area works too. Avoid warm-mist humidifiers with heating elements, since they pose a burn or knock-over risk.
Gently wipe discharge from the nose and eyes with a warm, damp cloth. Cats rely heavily on smell to stimulate appetite, so a congested cat often stops eating. Warming their food slightly can release more aroma and encourage them to eat. Make sure fresh water is always available, since hydration helps thin mucus. Never give your cat human cold medications, as many common ingredients are toxic to cats.
Signs That Need Urgent Veterinary Care
Most mild respiratory infections resolve on their own, but certain signs indicate your cat needs professional help quickly. Open-mouth breathing in a cat is always an emergency. Unlike dogs, cats do not pant under normal circumstances, so if your cat is breathing with their mouth open, something is seriously wrong.
Other warning signs to watch for:
- Blue or pale gums, which signal inadequate oxygen
- Rapid, shallow breathing or continuous panting at rest
- Standing with elbows pointed outward and neck extended, a posture cats adopt when struggling to get air
- Exaggerated belly movement while breathing, where the abdomen pumps visibly with each breath
- Refusal to eat or drink for more than 24 hours
- Thick yellow or green nasal discharge, which suggests a bacterial infection that may need antibiotics
- Symptoms lasting longer than 10 to 14 days without improvement
A vet visit for respiratory symptoms typically involves a physical exam and may include chest X-rays, blood work, or swabs to identify the specific pathogen involved. If a bacterial infection is confirmed or strongly suspected, antibiotics are the standard treatment. For viral infections, care is mostly supportive: keeping the cat hydrated, nourished, and comfortable while their immune system does the work.
Vaccination Reduces Severity
Vaccines against feline herpesvirus and calicivirus are considered core vaccines, meaning every cat should receive them. Kittens typically start the series as early as 6 weeks of age, with boosters every 3 to 4 weeks until they’re 16 to 20 weeks old. After that, adult cats receive boosters every 3 years for injectable versions or annually for the intranasal (nose drop) form.
These vaccines don’t guarantee your cat will never get a respiratory infection. What they do is significantly reduce the severity of illness. Vaccinated cats that do get infected generally have milder symptoms and are far less likely to die from the disease. The intranasal vaccine has an added benefit: one study showed it also helped reduce symptoms caused by Bordetella bacteria, even though the vaccine doesn’t specifically target that pathogen. For cats in shelters or multi-cat environments where respiratory infections spread rapidly, even a single dose at intake provides meaningful protection.