Cat Upper Respiratory Infection: Symptoms, Treatment, and Recovery Time

Short Answer

A cat upper respiratory infection (URI) is usually a viral or bacterial illness affecting the nose, sinuses, throat, or eyes rather than the lungs. The most common signs are sneezing, nasal or eye discharge, congestion, and a drop in appetite. Most mild cases improve within 7 to 10 days with supportive care at home, though some cats need prescription treatment to recover fully. A cat with severe, worsening, or prolonged symptoms should be evaluated by a veterinarian rather than left to manage on its own.

Medically reviewed by Dr. Janice, DVM.

What Counts as an Upper Respiratory Infection in Cats

An upper respiratory infection in cats involves the nose, sinuses, throat, and sometimes the eyes, as opposed to a lower respiratory illness affecting the lungs and airways deeper in the chest. Owners often call it "cat flu" or "cat cold" because the symptoms resemble a human cold, though the viruses involved are entirely species-specific and cannot spread to people. The two most common causes are feline herpesvirus-1 and feline calicivirus, and a secondary bacterial infection can develop on top of either one. Cats living in shelters, multi-cat households, or those recently adopted or boarded face a higher risk because these viruses spread easily through close contact and shared surfaces.

For a broader look at everything that can cause sneezing in cats, including causes unrelated to infection, our cat sneezing guide covers the full picture and is a good starting point if you are not yet sure what you are dealing with.

Recognizing the Symptoms Early

Sneezing is usually the first thing owners notice, sometimes paired with nasal congestion and clear or colored discharge from one or both nostrils. Eye involvement is also common, showing up as watery or crusty discharge, mild squinting, or redness around the eyelids. Cats often eat less during a URI, partly because congestion dulls their sense of smell, and mild lethargy can accompany the reduced appetite. In more congested cats, you may hear noisy or open-mouth breathing, particularly after resting or eating.

What Causes Sneezing and Congestion to Start

Feline herpesvirus-1 and feline calicivirus account for the large majority of upper respiratory infections in cats, and both spread through direct contact, shared bowls, and airborne droplets from sneezing. Stress is a well-known trigger for flare-ups in cats that already carry the herpesvirus, so a recent move, a new pet in the home, or a boarding stay can bring on symptoms in a cat that seemed perfectly fine before. Secondary bacterial infections can complicate a viral case, often producing thicker or discolored discharge along with a low fever. It is also worth noting that environmental irritants such as dust, smoke, or strong cleaning products can cause mild sneezing that mimics a URI without any infectious cause at all. If your cat sneezes mainly around certain products or seasons, our article on cat allergies vs a cold can help you tell the difference.

When Sneezing Signals Something More Serious

Most URIs are uncomfortable but manageable at home. Certain signs, however, point to a case that needs prompt veterinary attention rather than a wait-and-see approach.

• Labored or open-mouth breathing at rest
• Refusing food for more than 24 hours
• Thick green or bloody nasal discharge
• Significant lethargy or hiding more than usual
• Eyes swollen shut or crusted closed

Kittens, senior cats, and cats with existing conditions such as feline immunodeficiency virus tend to decline faster than healthy adult cats, so it is reasonable to seek evaluation earlier in these cases rather than waiting out the typical timeline. If you are dealing with a very young cat, our guide to kitten sneezing causes outlines the risk factors specific to that age group.

How Veterinarians Diagnose a Cat Upper Respiratory Infection

In most cases, a veterinarian diagnoses a URI based on the history you provide and what they observe during a physical exam, such as nasal discharge, eye involvement, and breathing effort. Diagnostic testing like PCR panels or bacterial cultures is generally reserved for cats with severe, recurring, or non-resolving symptoms, or for shelters trying to identify a specific outbreak strain. A video visit can work well for an initial URI assessment, since a veterinarian can see the discharge, watch how your cat is breathing, and check eye involvement closely enough to decide whether supportive care or prescription treatment is the right next step. If a visit points toward a URI, our page on cat upper respiratory infection treatment online outlines what that process typically looks like.

Most of the URI cases I see on video visits are cats that are sneezing, a little congested, and eating less, but still alert and moving around normally. I can usually tell within a few minutes of watching them breathe and looking at the discharge whether this is something we can manage with supportive care or whether it needs medication started right away.

Dr. Mickey, DVM

Treatment Options Vets May Recommend

Supportive care is the foundation of URI treatment for most cats. This means keeping your cat hydrated, gently cleaning discharge from the nose and eyes with a warm damp cloth, and finding ways to encourage eating, such as warming food slightly to make it more aromatic. A humidifier or a few minutes in a steamy bathroom can help loosen nasal congestion and make breathing more comfortable. When a veterinarian suspects a secondary bacterial infection or a significant herpesvirus flare, they may prescribe an antiviral or antibiotic medication, and eye drops or ointment are often added when conjunctivitis or eye discharge is present. Because eye involvement is so common with feline URI, our cat eye infection treatment online page has more detail on how that side of treatment usually works. TelaVets veterinarians can prescribe appropriate medication after a virtual exam when it is clinically indicated, with same-day prescriptions available when the situation calls for it.

Cat Upper Respiratory Infection Recovery Time

Mild URI cases typically improve within 7 to 10 days with supportive care alone, following a course similar to a mild human cold. Cats dealing with a secondary bacterial infection, or those with a weakened immune system, may take 2 to 3 weeks to fully recover, and some benefit from a course of antibiotics to get there. It is also worth knowing that many cats become lifelong carriers of feline herpesvirus after their first infection, meaning occasional flare-ups can return during periods of stress even years later. If symptoms have not started improving after 10 to 14 days, that is a reasonable point to schedule a recheck rather than continuing to wait it out. Cats whose sneezing drags on well past this window may fall into a different category worth reading about in our piece on chronic sneezing in cats.

Caring for a Sneezing Cat at Home

A consistent daily routine helps most cats get through a mild URI more comfortably while you watch for any signs that things are heading in the wrong direction.

1. Wipe nasal and eye discharge gently with a warm, damp cloth several times a day to keep your cat more comfortable and breathing easier.
2. Offer strong-smelling, slightly warmed wet food to encourage eating when your cat's sense of smell is dulled by congestion.
3. Run a humidifier in the room where your cat rests, or let them sit in a steamy bathroom for 10 to 15 minutes once or twice a day.
4. Keep your cat warm, quiet, and away from other pets to reduce stress and limit the spread of infection.
5. Track appetite, energy, breathing, and discharge color daily so you can notice quickly if anything worsens instead of improves.

Preventing Future Upper Respiratory Infections

Keeping vaccinations current is one of the most effective steps you can take, especially for cats living in multi-cat households or those with any shelter history. Reducing stress during transitions such as moving homes, boarding, or introducing a new pet can lower the odds of triggering a herpesvirus flare-up in a cat that already carries the virus. Newly adopted cats should ideally be kept separate from resident cats for a week or two before full introductions, since incubating infections are not always obvious right away. In homes with multiple cats, regularly cleaning shared food bowls, litter boxes, and bedding helps cut down on how easily viruses pass between cats.

I always tell owners in multi-cat homes that isolation during the first week or two after adoption is not overkill. A cat can look completely healthy at pickup and start sneezing three days later once the stress of the move catches up with a virus that was already there.

Dr. Janice, DVM

Related Symptoms Worth Tracking Separately

Not every sneezing cat fits neatly into a typical URI picture, and a few overlapping symptom patterns deserve their own attention. Watery eyes alongside sneezing sometimes point to a different or compounding issue, which we break down in cat sneezing and watery eyes. Blood in nasal discharge is a distinct red-flag scenario that warrants its own evaluation, covered in cat sneezing blood. If your cat also develops head shaking or ear odor during a bad URI flare, it is worth reviewing our cat ear infection treatment online page, since secondary ear involvement can occur in more severe cases.

When to Book a Virtual Vet Visit

A virtual visit is a reasonable first step for a cat with mild to moderate sneezing, discharge, or a reduced appetite, as long as breathing looks normal and your cat is still moving around and drinking. TelaVets offers same-day, night, and weekend video appointments with licensed veterinarians for a flat $65 per visit, with no memberships or hidden fees, available across all 50 states through a simple Google Meet call. That said, in-person emergency care is still the right call for a cat showing labored breathing, complete refusal to eat, or eyes swollen shut, since those situations can move quickly and may need hands-on treatment.

Frequently Asked Questions

How long does a cat upper respiratory infection last?

Most mild cases clear up in 7 to 10 days with supportive care, though secondary infections or a weakened immune system can extend recovery to 2 to 3 weeks. If there is no improvement after 10 to 14 days, it is a good idea to schedule a recheck with a veterinarian.

Can a cat upper respiratory infection go away on its own?

Mild viral cases often improve on their own with rest, hydration, and regular cleaning of the eyes and nose. However, bacterial complications, kittens, and senior or immunocompromised cats often need veterinary treatment to avoid the infection worsening.

Is a cat upper respiratory infection contagious to other cats?

Yes, URI spreads easily between cats through direct contact, shared food and water bowls, and droplets from sneezing. Newly adopted or symptomatic cats should be kept separate from other household cats until symptoms resolve.

Can humans catch a cat's upper respiratory infection?

The common viral causes of feline URI, such as herpesvirus-1 and calicivirus, are species-specific and are not known to spread to people. Good hygiene after handling a sick cat is still a sensible precaution, especially in households with multiple pets.

When should I take my cat to the vet for sneezing?

Book a vet visit if sneezing is frequent, paired with colored discharge, eye swelling, appetite loss, lethargy, or labored breathing, or if mild sneezing has not improved after about a week. Earlier evaluation is wise for kittens, senior cats, and those with existing health conditions.

Can I treat my cat's upper respiratory infection without going to a clinic?

For cats that are eating, breathing normally, and not severely lethargic, a virtual veterinary visit can be a convenient way to get an assessment and, when appropriate, a same-day prescription without an in-person trip. Cats in respiratory distress or refusing food entirely still need in-person emergency care.

This article is for general educational purposes and is not a substitute for an individualized veterinary exam. If your cat is showing signs of respiratory distress or a medical emergency, contact a local emergency veterinary hospital right away.

Sources: VCA Animal Hospitals: Feline Upper Respiratory Infection, Cornell Feline Health Center: Respiratory Infections