When to see a vet urgently
Difficulty breathing needs immediate help whether or not bronchitis has already been diagnosed:
- your cat breathes with an open mouth or seems to be struggling for air;
- the tongue or gums turn bluish;
- your cat stretches their neck forwards and breathing is clearly laboured even at rest.
Find an emergency vet. Do not wait for the next scheduled check if breathing becomes difficult.
Overview
The bronchi carry air into and out of the lungs. During inflammation, their lining swells, the airways narrow and more mucus is produced. This makes breathing harder and causes coughing. In cats, bronchitis can develop as a disease in its own right or result from infections, allergies or other airway diseases.
In chronic bronchitis, airway inflammation may continue even when its original trigger can no longer be identified. The ciliated cells that normally help clear mucus may not function properly. Increased mucus and structural airway changes, in turn, sustain symptoms. Prolonged disease therefore does not always mean a continuing infection.
Asthma and chronic bronchitis belong to the same group of lower airway diseases, but they are not identical in every respect. Asthma particularly involves allergic inflammation and a tendency for the airways to constrict. In chronic bronchitis, inflammatory cells in airway samples are usually different. In practice, there is considerable overlap in symptoms.
Causes
Important causes of bronchitis in cats include:
- viruses and bacteria, such as respiratory viruses and Bordetella;
- allergic reactions to dust, smoke or chemicals;
- parasites, including lungworms;
- irritants, such as tobacco smoke, aerosols and exhaust fumes;
- complications following a cold;
- weakened immunity in elderly or sick animals.
The word cold alone does not define the cause of disease. Investigations distinguish possible infection, parasitic disease and non-infectious inflammatory disease. An irritant may worsen already sensitive airways without having caused the original damage. Smoke, fragrances and dust, for example, can increase symptoms even when no bacterial infection is found in the bronchi.
The precise origin of chronic bronchitis often remains unclear. It is therefore not automatically the same as an untreated acute bacterial disease. A long duration of coughing alone does not show that antibiotics are needed either. Treatment is chosen according to the inflammation and other findings identified during investigations.
Risk factors
- cats that go outdoors, with greater exposure to infections and irritants;
- households where people smoke or use many chemicals;
- cats with chronic airway diseases;
- elderly cats with reduced immune defences.
Information on risk factors for chronic bronchitis in cats is limited. Age, outdoor access or indoor air irritants do not confirm a diagnosis alone, and an indoor cat is not protected from lower airway inflammation. In a study comparing asthma and chronic bronchitis, history or age alone did not reliably distinguish the diseases.
Symptoms
Typical symptoms of bronchitis in cats include:
- bouts of coughing that may resemble retching;
- breathlessness and difficulty breathing;
- wheezing during breathing;
- excessive salivation;
- reduced activity and listlessness;
- bluish mucous membranes from oxygen deprivation in severe cases.
A coughing cat may crouch low and stretch their neck forwards. A retch may follow the cough, making it easy to mistake the episode for vomiting a hairball. Repeated episodes of this kind should not be treated as a simple hairball problem without investigation. At the appointment, also explain whether your cat brings up vomit during the episode or only coughs.
A cat with chronic bronchitis or asthma may retain a normal appetite, and fever is not typical of these conditions. Normal eating therefore does not rule out airway disease. If your cat also has a fever, marked weakness or loss of appetite, other possibilities, such as pneumonia, are investigated.
Possible complications
Untreated bronchitis may become chronic and cause permanent airway changes. Consequences can include:
- chronic respiratory failure;
- development of asthma;
- secondary infections;
- reduced quality of life.
Asthma should not be understood as the inevitable next stage of chronic bronchitis. The conditions can look similar, but the nature of inflammation may differ. Long-standing mucus accumulation and narrowing can nevertheless impair breathing and predispose to secondary problems. Seek care for symptoms before bluish mucous membranes or other signs of severe oxygen deprivation appear.
Diagnosis at the vet
The vet may use the following to confirm the diagnosis:
- a clinical examination and listening to the lungs;
- chest X-rays;
- blood tests to identify inflammation or infection;
- examination of airway samples;
- parasite tests for lungworms.
What can the results tell you?
X-rays may show changes in bronchial walls and surrounding tissue. Imaging also helps look for other lung or heart disease. The appearance of a chest X-ray alone does not always distinguish asthma from chronic bronchitis, however. In some cats with asthma, the image may even look normal.
Blood tests assess your cat's general health. An increase in white blood cells called eosinophils may be associated with allergy or parasitic disease, but does not settle the diagnosis alone. The study comparing asthma and bronchitis showed that no single symptom, blood count or X-ray finding was sufficient for reliable differentiation.
An airway wash introduces a small amount of sterile fluid into the airways and collects it again for testing. The sample's cells help assess the type of inflammation, while bacterial culture investigates possible infection. Endoscopy can also examine the airway lining. Sampling may require sedation or general anaesthesia, so its need is assessed according to your cat's condition.
Parasite tests complement the investigation because lungworms can cause similar coughing. Pneumonia and tumours are also possible alternative explanations. Bronchitis is therefore not diagnosed simply by observing that a cat coughs and wheezes.
Coughing caused by bronchitis is easily confused with an asthma attack. Read more in Asthma in cats.
Treatment and long-term monitoring
Reducing airway inflammation is central to treating chronic non-infectious bronchitis. A corticosteroid prescribed by the vet may be used for this. An airway-opening medicine may be needed if narrowing or constriction is present, but it does not replace treating inflammation. The medicine and route of administration depend on the disease identified and symptom severity.
If bacterial bronchitis is suspected, culture and susceptibility testing of an airway sample help choose medication. In a mild, stable situation, results may sometimes be awaited without antibiotics, whereas more severe disease may require treatment to start earlier. The same antibiotic course is therefore not automatically given to every coughing cat.
Severe breathing difficulties may require hospital care and supplemental oxygen before further investigation. Home care begins only when breathing is stable enough. Any previously prescribed medicine for an episode is given only according to your cat's own treatment plan. Do not copy another pet's medicines or dosing instructions.
Giving inhaled medication
Some medicines can be delivered to the airways using an inhaler, spacer and a mask placed over the face. The spacer holds the medicine so that your cat can inhale it through normal breathing. Your cat does not need to time an inward breath with the release of medicine as a person does.
Introduce the mask calmly through positive experiences. The fit and seal affect delivery of medicine to the airways. Ask the practice to demonstrate its use and practise with guidance. Clean the mask and other parts according to the manufacturer's instructions: cleanliness helps the device function and reduces microbial build-up. If you cannot give the medicine, review the approach with your vet.
What should you monitor at home?
Record coughing episodes, breathing changes and whether your cat can manage normal activities. At follow-up, also mention difficulties giving medication and possible adverse effects. Long-term treatment aims to reduce episodes and keep daily life as normal as possible. Chronic bronchitis and asthma are often manageable but usually do not disappear permanently after a short course of treatment.
Remove smoke and strong fragrances from your cat's surroundings. Dusty litter can be replaced with a less dusty option, and cleaning sprays that irritate breathing avoided. Environmental changes support medication rather than replacing it. The effectiveness of air purifiers or avoiding individual allergens has not been fully established in feline patients.
Prevention
Several measures can help prevent bronchitis:
- vaccinations against respiratory infections;
- regular parasite treatment;
- maintaining clean air at home;
- avoiding smoking around your cat;
- balanced nutrition and support for immune function;
- regular veterinary check-ups.
Not every case of chronic bronchitis can be prevented because the original cause is often unknown. Vaccination and parasite control are planned according to your cat's risks, but they do not correct existing non-infectious airway inflammation. Recurring symptoms require treatment review even when preventive measures are in place.
This text provides general information and does not replace veterinary care. If your cat develops symptoms, contact a vet.
Frequently asked questions
Could the cough be caused by a hairball?
Coughing followed by retching can look like an attempt to vomit. Repeated cough-like episodes should not be attributed to a hairball without investigation, however. With airway disease, no hairball may come out at all.
Does a cat always need antibiotics for bronchitis?
No. Chronic inflammation may be non-infectious, in which case treatment primarily targets the inflammatory response. The need for antibiotics is assessed according to possible bacterial infection and investigation results.
Can a cat live normally with chronic bronchitis?
Many cats can lead active lives when symptoms are monitored and care is tailored to their needs. The disease often requires long-term treatment and check-ups. New difficulty breathing needs urgent help even when previous disease control has been good.
This article is for general information only and is not a guide to treatment. If you notice the first signs of illness, contact your vet.
Paw4care editorial team
Sources
- Breathe easy: inhalational therapy for feline inflammatory airway disease, Journal of Feline Medicine and Surgery, accessed 2026-11-02.
- Feline Asthma: What You Need To Know, Cornell University College of Veterinary Medicine, accessed 2026-11-02.
- Asthma and Bronchitis in Cats, VCA Animal Hospitals, accessed 2026-11-02.
- Understanding Feline Asthma, University of Missouri Veterinary Health Centre, accessed 2026-11-02.
- Respiratory: Companion Animal Medical Guidelines, University of Melbourne, accessed 2026-11-02.
- Dyspnea (Difficulty Breathing), Cornell University College of Veterinary Medicine, accessed 2026-11-02.
- Comparison of signalment, clinical, laboratory and radiographic parameters in cats with feline asthma and chronic bronchitis, Journal of Feline Medicine and Surgery, accessed 2026-11-02.