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Breathing difficulty is an emergency. Seek immediate veterinary or emergency-hospital care if your cat is open-mouth breathing, panting, using obvious effort to breathe, has blue or gray gums, collapses, is severely weak, or cannot swallow. Do not give human cold medicine, decongestants, leftover antibiotics, or unprescribed antiviral drugs.
What is a cat upper respiratory infection?
Feline upper respiratory infection describes a group of clinical signs affecting the nose, sinuses, throat, eyes, and sometimes the mouth. It is not one single disease. Veterinarians may also use the term feline respiratory disease complex because several pathogens can cause overlapping illness or occur together.
The most common causes are feline herpesvirus type 1—also called feline viral rhinotracheitis—and feline calicivirus. Other possible contributors include Chlamydia felis, Mycoplasma species, and Bordetella bronchiseptica. Less commonly, another organism or a noninfectious problem may be responsible. The Merck Veterinary Manual overview of feline respiratory disease complex explains why signs alone often cannot identify the exact cause.
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A “cat cold” may be mild, but it should not automatically be dismissed as harmless. Kittens, senior cats, cats with chronic disease or impaired immunity, and cats living in crowded or stressful environments have a higher risk of serious complications.
Common causes and how they differ
| Cause | Signs it may produce | Important limitation |
|---|---|---|
| Feline herpesvirus type 1 | Sneezing, rhinitis, fever, conjunctivitis, watery or inflamed eyes, and sometimes corneal disease | The virus can remain latent for life. Stress may reactivate it, causing recurrent eye or nose symptoms. |
| Feline calicivirus | Sneezing, nasal discharge, fever, drooling, mouth or tongue ulcers, reduced appetite, and occasionally pneumonia | Different strains can produce substantially different illness, ranging from mild disease to severe systemic illness. |
| Chlamydia felis | Often prominent conjunctivitis and eye discharge, sometimes with respiratory signs | It may require targeted veterinary treatment, and it has occasionally been associated with conjunctivitis in people. |
| Mycoplasma species or Bordetella bronchiseptica | Eye, nose, or respiratory signs that can resemble viral infection | Testing and treatment decisions depend on the examination and clinical context. |
Herpesvirus often emphasizes the eyes and nose, while calicivirus is more commonly associated with oral ulcers and drooling, but these are tendencies rather than reliable rules. A cat can have more than one infection, and clinical signs cannot consistently distinguish herpesvirus from calicivirus.
How cats catch respiratory infections
Infected cats can spread organisms in droplets and in secretions from the nose, eyes, and mouth. Direct contact—such as grooming, nuzzling, or sharing close living space—is a common route. Transmission can also occur through contaminated hands and objects, including:
- Food and water bowls
- Bedding and blankets
- Toys
- Litter equipment
- Carriers and grooming supplies
Cats may be contagious during incubation and for weeks after signs begin; VCA Animal Hospitals reports that infectivity can continue up to three weeks after signs start. Some recovered cats remain carriers or continue shedding an organism. Feline herpesvirus can remain dormant in the body and reactivate during stress, so recurring sneezing or conjunctivitis does not necessarily mean a new exposure occurred. Crowding, transportation, boarding, shelter housing, breeding colonies, and other stressful situations increase the chance of spread and illness. Kittens and cats with another disease or a weakened immune system are more likely to become seriously ill. The Cornell Feline Health Center’s respiratory infection guidance provides additional context on risk and recurrence.
Cat URI symptoms: what to watch for
Typical upper respiratory signs include:
- Repeated sneezing
- A blocked or congested nose
- Clear, cloudy, yellow, or otherwise thick nasal discharge
- Watery eyes or conjunctivitis
- Squinting or eye discharge
- Fever, tiredness, or reduced activity
- Decreased appetite, often because congestion makes food harder to smell
- Drooling or painful mouth ulcers, particularly with calicivirus
- Coughing in some cats
Some cats develop fast breathing or labored breathing. Those signs are not something to monitor casually at home, because they can indicate lower-airway disease, pneumonia, or another serious problem. Prominent coughing, breathing effort, or a change in breathing pattern should prompt veterinary assessment rather than being assumed to be a routine cold.
VCA Animal Hospitals reports uncomplicated cases commonly last 7 to 14 days, and sometimes up to 21 days. Severe infections, secondary complications, or chronic disease can persist longer. Duration alone does not establish the cause, so a cat that is worsening or failing to recover should be rechecked.
When a cat URI is an emergency
Go to a veterinarian or emergency hospital immediately for:
- Open-mouth breathing or panting
- Obvious effort to breathe, such as pronounced abdominal movement, extended neck, or struggling for each breath
- Blue, gray, or unusually pale mucous membranes
- Collapse or severe weakness
- Inability to swallow
- Rapidly worsening respiratory signs
Cats normally breathe through their noses. Open-mouth breathing is not a normal symptom of an ordinary feline cold. Keep the cat as calm as possible and arrange transport; do not delay emergency care to try home remedies. A secure cat carrier for veterinary visits can make transport safer, but a carrier is not treatment and should not delay leaving for the clinic.
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Arrange prompt veterinary evaluation—even without an obvious breathing emergency—if your cat is not eating, appears dehydrated or depressed, has severe eye disease, is a very young kitten, is elderly, has another illness, or has persistent or worsening signs. Untreated or complicated disease can lead to pneumonia, corneal injury, chronic nasal disease, or other serious problems. The VCA emergency guidance for cats and ASPCA information on common cat diseases describe warning signs that require urgent attention.
How veterinarians diagnose a cat upper respiratory infection
A veterinarian usually starts with the history and a physical examination. Be prepared to describe when the signs began, whether they are improving, what your cat has eaten and drunk, whether other cats are ill, and any recent boarding, adoption, travel, or household stress.
The examination may include assessment of:
- Breathing rate and effort
- Temperature
- Hydration
- Appetite and body condition
- The eyes, including the corneas
- Nasal passages and discharge
- The mouth and tongue for ulcers or painful lesions
- The lungs and heart
Testing is not necessary for every uncomplicated case. Because several viruses and bacteria produce similar signs, however, a veterinarian may recommend PCR or other laboratory testing for severe, recurrent, unusual, or outbreak-related illness, or when managing a shelter or breeding population. A positive test must be interpreted in context: detecting an organism does not always prove it is the sole cause of the current signs.
Chest X-rays or other imaging may be appropriate if the cat is coughing, breathing rapidly or shallowly, working hard to breathe, or suspected of having pneumonia. Imaging and additional tests can also help investigate asthma, heart disease, a foreign body, or another lower-respiratory condition. The Merck Veterinary Manual’s guide to feline lung and airway disorders outlines why respiratory signs may require investigation beyond the nose and eyes.
Cat URI treatment
For an uncomplicated infection, treatment is usually centered on supportive care selected by a veterinarian. The goals are to keep the cat hydrated, maintain nutrition, control painful or damaging eye disease, and identify complications early.
Veterinary treatments may include
- Fluids for dehydration
- Eye medication when conjunctivitis, corneal disease, or another eye problem requires treatment
- Antiviral medication for selected herpesvirus cases
- Appetite support or treatment for nausea and pain when appropriate
- Oxygen therapy for cats that cannot maintain adequate oxygenation
- Hospitalization and monitoring for severe disease, dehydration, pneumonia, or inability to eat
- An appropriate antibiotic when a bacterial infection, secondary bacterial complication, or specific bacterial pathogen is suspected or diagnosed
Antibiotics do not treat viral infections. Do not give leftover antibiotics, share medication prescribed for another animal, change the dose, or stop a prescribed course without speaking with the veterinarian. The wrong drug can be ineffective, cause side effects, complicate future treatment, or delay recognition of pneumonia or another diagnosis.
Never give a cat human cold medicine, decongestants, combination flu products, pain relievers, or unprescribed antiviral drugs. Many human products are dangerous to cats even in small amounts. If your cat has already received a human medication, contact a veterinarian or animal poison service immediately and bring the package or a photograph of its ingredients.
Safe supportive care at home
Home care can support comfort while you arrange veterinary advice or follow a treatment plan. It does not replace an examination when the cat is very young, very ill, not eating, dehydrated, or having breathing problems.
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1. Keep the cat warm, quiet, and separate
Provide a warm, calm room away from household noise and other animals. Stress can worsen illness and may trigger herpesvirus recurrence. Separation also reduces exposure for healthy cats. Use dedicated bowls, litter equipment, bedding, and toys where possible, and wash your hands after handling the sick cat.
2. Encourage food and water intake
Congestion reduces a cat’s ability to smell food, while calicivirus-related mouth ulcers can make eating painful. Offer small portions of palatable, strongly scented wet food. Slightly warming food can increase its aroma, but check the temperature before serving. Monitor how much your cat eats and drinks rather than assuming a few licks are sufficient.
Do not force-feed a cat that will not swallow. Food or liquid can enter the airway and cause aspiration. A cat that refuses food, cannot swallow, is drooling heavily, or seems painful needs veterinary advice promptly. Kittens can deteriorate quickly.
3. Gently clean discharge
Use a clean, moist, soft cloth to loosen discharge from the eyes and nose. Wipe gently rather than scrubbing. Use a clean area of the cloth for each eye, and do not share cloths between cats. A soft cloth for cleaning cat eye discharge may be useful for this low-pressure task, but persistent squinting, a cloudy eye, a painful eye, or an eye that remains closed requires veterinary examination.
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Humidification may loosen secretions and make congestion more comfortable. VCA Animal Hospitals describes supervised exposure to bathroom steam for about 10 to 15 minutes several times daily. Keep the cat away from hot water, avoid overheating, and stop if the cat becomes distressed.
A cleanable cool-mist humidifier is another way to add moisture to the room while you monitor your cat. It is a comfort-support item, not a cure, and it must not replace veterinary care. Follow the device’s cleaning instructions, prevent access to electrical cords or spilled water, and do not add essential oils, fragrances, or vapor products. Essential oils can be harmful to cats and should not be used around them unless a veterinarian specifically confirms a product and method are safe.
5. Track changes
Record breathing effort, appetite, water intake, urination, activity, eye appearance, and nasal discharge. Contact the veterinarian if signs worsen, fail to improve, or interfere with eating. If breathing becomes difficult, skip home monitoring and seek emergency care.
Isolation, cleaning, and preventing spread
For a sick cat in a multi-cat home, use a separate room with its own food and water equipment, litter box, bedding, and cleaning supplies. Handle healthy cats first and the sick cat last when practical. Wash your hands between animals, and change clothing or use gloves if secretions are likely to contaminate your hands or clothes.
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Wash bowls, bedding, and washable equipment regularly. Clean visible organic material before applying a disinfectant, and use a product labeled as effective against feline calicivirus when that virus is a concern. Follow the label’s dilution, safety, and contact-time instructions; not every household disinfectant reliably inactivates every feline pathogen. Do not mix cleaning chemicals, and keep cats away from wet or inadequately rinsed surfaces.
Washable stainless-steel cat bowls are a practical option for dedicated feeding and water stations because they can be cleaned between cats. The material itself does not prevent infection; separation, hand hygiene, appropriate cleaning, ventilation, and population management do the important disease-control work.
In shelters, catteries, breeding colonies, and crowded multi-cat homes, prevention also depends on reducing crowding, improving ventilation, isolating new or sick cats, minimizing stress, and avoiding shared equipment. Shelter-medicine recommendations on disease management and fomite control are especially relevant to facilities caring for many cats.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Vaccination and long-term prevention
Core vaccination against feline herpesvirus and calicivirus reduces the severity and duration of illness, but it cannot guarantee that a vaccinated cat will never become infected. Vaccine schedules and boosters should be based on the cat’s age, health, lifestyle, exposure risk, vaccine product, and veterinarian’s recommendation.
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Vaccination against Chlamydia felis or Bordetella may be considered in selected high-risk environments. These vaccines are not automatically necessary for every household cat. Discuss the risks and likely benefit with your veterinarian, particularly if your cat lives in a shelter, cattery, breeding colony, or other setting with repeated respiratory outbreaks.
Additional prevention steps include:
- Separate a newly adopted cat from resident cats for 1 to 2 weeks, following veterinary or shelter guidance.
- Keep sick cats away from healthy cats until the veterinarian advises that normal contact is appropriate.
- Reduce crowding and provide enough litter boxes, resting areas, food stations, and hiding spaces.
- Maintain good ventilation without exposing cats to cold drafts or irritating fumes.
- Wash hands between cats and avoid sharing bowls, bedding, toys, carriers, or grooming tools.
- Use predictable routines and quiet spaces to reduce stress, especially for cats with a history of herpesvirus flare-ups.
How serious is a cat URI, and will it come back?
Many otherwise healthy cats recover from an uncomplicated infection. The outlook is less predictable for kittens, older cats, and cats with chronic respiratory, heart, kidney, immune, or other disease. Complications can include dehydration, failure to eat, pneumonia, corneal injury, chronic nasal inflammation, recurrent conjunctivitis, and persistent oral disease.
Feline herpesvirus can remain latent for life. A cat may therefore have future episodes of sneezing, nasal discharge, or conjunctivitis, particularly after illness, environmental change, boarding, or another stressor. Recurrence does not mean the cat should automatically receive antibiotics or supplements. Repeated, severe, or changing episodes deserve veterinary reassessment to confirm the diagnosis and look for chronic nasal disease, eye damage, dental or oral disease, asthma, or another condition.
L-lysine should not be presented as a proven treatment. Evidence is controversial, and Cornell notes that some studies suggest it may be ineffective or could worsen signs and viral shedding. Ask your veterinarian before giving any supplement, especially to a cat taking other medication.
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Can people or other pets catch a cat URI?
Feline herpesvirus and feline calicivirus are host-specific and pose no known human risk. Routine handwashing is still sensible because people can carry secretions on their hands or clothing from one cat to another.
Chlamydia felis has occasionally been associated with conjunctivitis in people. The risk appears uncommon, but use careful hand hygiene and seek veterinary guidance if a cat with suspected Chlamydia felis lives with an immunocompromised person or someone develops eye symptoms after contact. Do not assume that every respiratory infection in a cat can infect people; the risk depends on the organism.
A practical decision checklist
- Check breathing first. Open-mouth breathing, visible effort, blue or gray gums, collapse, or inability to swallow means emergency care now.
- Check eating, drinking, and alertness. A cat that will not eat, cannot drink, is dehydrated, or is markedly depressed needs prompt veterinary advice.
- Look at the eyes and mouth. Squinting, a cloudy cornea, a persistently closed eye, severe discharge, drooling, or mouth ulcers can require prescription treatment and pain control.
- Separate the cat from other cats. Use dedicated equipment and wash hands between animals.
- Offer safe comfort care. Quiet warmth, palatable wet food, gentle cleaning, and carefully supervised humidity may help while arranging care.
- Do not self-prescribe. Avoid human medicines, essential oils, leftover antibiotics, unprescribed antivirals, and unproven supplements.
- Follow up if the course is not straightforward. Persistent, recurrent, worsening, or severe disease may need testing, imaging, prescription treatment, or hospitalization.
Further veterinary information
- Merck Veterinary Manual: Feline respiratory disease complex
- Merck Veterinary Manual: Feline respiratory disease complex for cat owners
- VCA: Feline upper respiratory infection
- Cornell Feline Health Center: Respiratory infections
- University of Florida Shelter Medicine: Disease management
FAQ
How long does a cat upper respiratory infection last?
VCA Animal Hospitals reports that uncomplicated cases commonly last 7 to 14 days and sometimes up to 21 days. Worsening signs, poor appetite, dehydration, eye pain, or failure to improve should prompt veterinary reassessment.
Can I give my cat antibiotics for a respiratory infection?
Only if a veterinarian prescribes them for that cat and situation. Antibiotics do not treat viral infections, and leftover or incorrect medication can cause harm or delay appropriate diagnosis and treatment.
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Is a humidifier good for a cat with congestion?
Carefully supervised humidification may loosen secretions and improve comfort, but it does not cure the infection. Keep equipment clean, avoid hot steam and essential oils, and never use humidity as a substitute for care—especially if breathing is difficult.
Can a cat URI spread to my other cats?
Yes. Respiratory organisms can spread during incubation and for weeks after signs begin, through droplets, direct contact, secretions, hands, bowls, bedding, litter equipment, and other contaminated objects. Separate the sick cat, use dedicated supplies, wash hands, and follow veterinary or shelter guidance.
Can humans catch a respiratory infection from a cat?
Feline herpesvirus and calicivirus are host-specific and pose no known human risk. Chlamydia felis has occasionally been associated with human conjunctivitis, so careful hand hygiene and veterinary guidance are appropriate.
The Bottom Line
Most uncomplicated cat upper respiratory infections can be managed successfully, but the same early signs may accompany serious disease. Separate the sick cat, support hydration and nutrition, clean discharge gently, and contact a veterinarian. If your cat is open-mouth breathing, struggling to breathe, collapsing, turning blue or gray, or unable to swallow, seek emergency care immediately.
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