A cat that’s coughing and wheezing almost always has something irritating or inflaming its lower airways. The most common causes are feline asthma, respiratory infections, allergies, heartworm disease, and inhaled foreign objects. Unlike dogs, cats rarely cough without a real underlying problem, so persistent coughing and wheezing deserve attention even if your cat seems fine otherwise.
Coughing vs. Hairballs: How to Tell the Difference
Many cat owners mistake a true cough for a hairball attempt, and vice versa. The distinction matters because one is routine and the other signals airway trouble.
A hairball episode starts with deep, rhythmic hacking. Your cat will hunch down with its neck extended, gag, retch, or make wet gurgling sounds, and eventually something comes up. The sound is distinctly moist and productive. A cough, on the other hand, sounds dry and harsh, similar to a human with a tickle in their throat. A coughing cat crouches low, extends its neck, and produces repeated wheezing or raspy sounds, but nothing comes up. If your cat has been “trying to cough up a hairball” for days without producing one, it’s likely coughing, not retching.
Feline Asthma
Asthma is one of the most common reasons cats cough and wheeze. It works much like human asthma: when a cat inhales something it’s allergic to, the immune system overreacts. Immune cells in the airways release histamine and other inflammatory chemicals that cause the airway muscles to tighten, the lining to swell, and mucus production to ramp up. All three of those changes narrow the airways, making it harder for air to flow and producing that characteristic wheeze.
The key feature of asthma is that this narrowing is reversible. Between episodes, a cat’s breathing can sound completely normal. During a flare, you’ll notice wheezing, a dry cough, and sometimes visible effort to breathe. Some cats have mild episodes every few weeks; others have severe attacks that leave them struggling for air.
Feline asthma is a lifelong condition with no cure, but it responds well to treatment. The standard approach involves inhaled corticosteroids (most commonly fluticasone) delivered through a small spacer device with a face mask fitted to the cat’s face. This gets anti-inflammatory medication directly into the lungs with fewer side effects than oral steroids. For acute flare-ups, a fast-acting bronchodilator like albuterol opens the airways within minutes. Vets generally recommend keeping albuterol as a rescue medication rather than using it daily, because bronchodilators alone don’t treat the underlying inflammation.
Getting a cat comfortable with an inhaler takes patience. Gradual acclimation to the face mask over days or weeks, with treats and positive reinforcement, makes a significant difference. Some owners find the process frustrating at first, but most cats learn to tolerate it.
Common Environmental Triggers
If asthma or allergies are behind your cat’s symptoms, identifying and reducing triggers in your home can cut the frequency of episodes. According to Cornell University’s College of Veterinary Medicine, suspected triggers include tobacco smoke, dusty cat litter, vapors from household cleaning products and aerosol sprays, pollen, mold, dust mites, candle and fireplace smoke, and even certain foods. The specific allergen is rarely identified in any given cat, so reducing exposure broadly tends to work better than trying to pinpoint one culprit.
Practical changes that help: switching to a low-dust or paper-based litter, avoiding aerosol sprays and plug-in air fresheners near your cat, running an air purifier, and keeping your cat away from cigarette smoke. These won’t cure asthma, but they can meaningfully reduce how often your cat has flare-ups.
Respiratory Infections
Bacterial and viral infections can cause coughing and wheezing, especially in kittens, senior cats, or cats with weakened immune systems. One common bacterial culprit, Mycoplasma felis, typically causes upper respiratory symptoms like sneezing and nasal discharge but can sometimes move into the lower airways. Mycoplasma often shows up as a secondary infection after a viral illness has already damaged the airway lining, making it easier for bacteria to take hold.
Bacterial respiratory infections generally respond well to antibiotics, with improvement often visible within a few weeks. If your cat’s coughing started suddenly alongside sneezing, eye discharge, or a runny nose, an infection is a strong possibility.
Heartworm-Associated Respiratory Disease
Heartworm doesn’t just affect dogs. In cats, even a small number of heartworm larvae can trigger a condition called Heartworm-Associated Respiratory Disease (HARD). Here’s what makes it tricky: the larvae don’t have to mature into adult worms to cause damage. When immature heartworms arrive in the lungs (roughly 70 to 90 days after a mosquito bite) and die there, the resulting inflammation produces coughing, wheezing, and labored breathing that looks almost identical to asthma on X-rays.
Diagnosing HARD is complicated. Antibody tests can detect exposure, but they turn negative over time, sometimes within eight months. The antigen test commonly used in dogs only picks up mature adult heartworms, which many cats with HARD never develop. A cat can test negative on every available heartworm test and still have lung damage from past larval exposure. Your vet may suspect HARD based on a combination of symptoms, X-ray patterns, and blood work showing elevated eosinophils (a type of white blood cell involved in parasitic responses). Monthly heartworm prevention is the most reliable way to protect cats, including indoor cats, since mosquitoes get indoors easily.
What Happens at the Vet
Expect your vet to start with a physical exam and chest X-rays. The X-ray pattern helps distinguish between asthma, infection, heartworm disease, and other problems. Blood work, including a complete blood count, can reveal elevated white blood cells that point toward infection, allergies, or parasitic disease. A fecal exam may be run to check for lungworms, another parasitic cause of coughing.
In some cases, your vet may recommend a bronchoalveolar lavage, a procedure where a small amount of fluid is flushed into the airways and collected for analysis. This can identify the specific type of inflammation present and detect bacteria like Mycoplasma. More advanced diagnostics like bronchoscopy (a tiny camera inserted into the airways) are available at specialty clinics when initial tests don’t provide a clear answer.
Signs That Need Emergency Care
Most coughing and wheezing episodes aren’t immediately life-threatening, but some situations require urgent veterinary attention. 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 its mouth open outside of brief moments of extreme exertion, something is seriously wrong.
Other emergency signs to watch for:
- Blue, gray, or pale gums or tongue, which indicate dangerously low oxygen levels
- Breathing rate above 40 to 60 breaths per minute while resting
- Sitting upright with head and neck extended, or standing with elbows spread wide, both postures cats adopt to maximize airflow when they’re in distress
- Inability to settle or lie down comfortably
- Collapse or sudden extreme weakness
If you see any of these, your cat needs emergency veterinary care right away. In the meantime, if you have an albuterol inhaler prescribed for your cat, administering two to four puffs through the spacer while on your way to the vet can help open the airways during a severe episode.
Living With a Chronic Cough
If your cat is diagnosed with asthma or chronic bronchitis, you’re managing a long-term condition rather than curing one. The good news is that most cats do well with consistent treatment. Inhaled corticosteroids delivered through a spacer and face mask remain the backbone of therapy, controlling the airway inflammation that drives symptoms. Nebulizers powered by batteries are another option for home use, particularly for cats that won’t tolerate a face mask.
Keeping the inhaler device clean following the manufacturer’s instructions is important both for effectiveness and to avoid introducing bacteria into your cat’s airways. Bronchodilators should be paired with anti-inflammatory medication rather than used alone, since they relieve symptoms without addressing the inflammation that causes them. With the right combination of medication, trigger reduction, and regular vet check-ins, most cats with chronic airway disease live comfortable, active lives.