Cat Respiratory Infection: Home Care and When to Call the Vet

Name: Cat Respiratory Infection: Home Care and When to Call the Vet
Creator: Dr. Zubair Khalid

By Dr. Zubair Khalid, DVM, MS, PhD · 2026-10-03

Most mild cat upper respiratory infections can be supported at home with rest, fluids, gentle nose care, and good nutrition while the immune system clears the virus. The tricky part is knowing when sneezing and a runny nose cross into pneumonia, or when a cat who seems "just sick" is actually blocked and cannot urinate. This guide shows you how to treat cat upper respiratory infection at home and when to stop waiting and call your vet.

This article is educational and is not a substitute for veterinary diagnosis or treatment.

Quick Answer

Mild upper respiratory infections in cats are usually viral, most often feline herpesvirus or calicivirus, and antibiotics do not kill viruses [1].
Home care focuses on keeping the nose clear, keeping the cat eating and drinking, and reducing stress so the immune system can work.
A cat that stops eating for more than 24 hours, breathes with an open mouth, or strains to urinate needs a veterinarian right away.
Never give human cold medicines, pain relievers, or leftover antibiotics to a cat. Many are toxic.
A blocked cat (especially a male) is a life-threatening emergency that looks nothing like a respiratory infection but is often mistaken for "just feeling bad."

What a Cat Respiratory Infection Looks Like

Upper respiratory infections are one of the most common reasons cats see a veterinarian. The signs usually start in the nose, throat, and eyes.

Typical signs include:

Sneezing, often in bursts
Clear, cloudy, or colored nasal discharge
Watery or thick eye discharge
Squinting, redness, or swelling around the eyes
Congestion that makes breathing sound noisy
Decreased appetite and smell
Lethargy, hiding, and low energy
Occasional coughing or gagging

A normal cat breathes quietly through the nose with the mouth closed. Normal resting breathing in a calm cat is generally under about 30 breaths per minute, though this varies with stress and temperature. A cat with a mild cold may sound congested but still breathes comfortably through the nose.

What is not normal: open-mouth breathing, breathing that uses the belly muscles, blue or pale gums, or a cat who cannot catch its breath. Those point to the lower airway or lungs and are emergencies.

Main Causes and How Urgent They Are

Viral infection is the most common cause of sudden rhinitis or sinusitis in cats, and feline viral rhinotracheitis (herpesvirus) and feline calicivirus are most frequently involved [1]. Bacterial infection often follows the initial viral infection, which is why some cats get a colored discharge after a few days [1].

A recent study found feline herpesvirus in 39.1% of cats with rhinitis compared to 8.1% of healthy cats, and Mycoplasma species in 28.3% of rhinitis cases versus 5.4% of healthy controls [2]. That tells you these organisms are common in sick cats but also sometimes present in healthy ones.

Cause	Typical clues	How urgent
Feline herpesvirus (FHV-1)	Sneezing, eye discharge, squinting, fever, often after stress	Usually mild, see a vet if it worsens
Feline calicivirus (FCV)	Mouth ulcers, drooling, limping, nasal discharge	See a vet, mouth pain stops eating
Mycoplasma species	Persistent nasal discharge, chronic rhinitis	Needs vet diagnosis and targeted treatment [2]
Secondary bacterial infection	Thick yellow or green discharge, worsening after a few days	See a vet, may need antibiotics [1]
Fungal rhinitis (Cryptococcus)	Long-lasting nasal discharge, swelling over the nose	See a vet, needs specific testing [1]
Pneumonia	Open-mouth breathing, fast breathing, weakness, fever	Emergency now
Urinary blockage	Straining in the litter box, crying, no urine, vomiting	Emergency now

Feline herpesvirus is a local contact pathogen that causes acute upper respiratory infections in cats, and it affects cats almost exclusively [3]. It can also cause eye disease, and upper respiratory infections are a common cause of eye problems in kittens [4].

If your cat has eye discharge or squinting, see our guide on Upper Respiratory Infection In Cats Symptoms for a closer look at what those signs mean.

Red Flags That Mean Emergency

Some signs mean you should not wait for a morning appointment.

Go to an emergency clinic now if your cat:

Breathes with an open mouth or pants
Has fast, labored breathing with the belly moving hard
Has blue, gray, or pale gums
Collapses, seems weak, or cannot stand
Strains to urinate with little or no urine produced, especially a male cat
Cries out while trying to urinate or licks the genital area constantly
Has a swollen, painful belly
Has a temperature you cannot measure safely (do not attempt a rectal temperature if your cat is struggling)

A urinary blockage is not a respiratory problem, but it is one of the most common and most deadly look-alikes. A blocked cat often hides, stops eating, vomits, and seems "off" in a way owners mistake for a cold. If your cat is straining in the box with no urine, that is an emergency, not a home care case. For urinary signs, see Treating Urinary Tract Infection In Cats At Home.

Heavy or labored breathing is also a red flag. A cat with pneumonia or fluid around the lungs cannot be treated at home. If you searched for a home remedy for cat heavy breathing, the honest answer is that there is no safe home remedy for true heavy breathing. That sign needs a veterinarian the same day or immediately.

How to Treat Cat Upper Respiratory Infection at Home

Home care does not cure the virus. It keeps your cat comfortable, hydrated, and eating while the immune system does its job. Here is what is safe and useful.

Keep the Nose Clear

Congestion blocks a cat's sense of smell, and cats often stop eating when they cannot smell food.

Use a warm, damp washcloth to gently wipe nasal discharge.
Run a cool-mist humidifier in the room, or let your cat sit in a steamy bathroom for 10 to 15 minutes.
Saline nose drops made for pets or plain sterile saline can help loosen crusts. Ask your vet before using any product.
Never use human decongestant sprays or drops. They can be toxic to cats.

Encourage Eating and Drinking

Warm the food slightly to boost the aroma.
Offer strong-smelling wet food, tuna water, or low-sodium chicken broth with no onion or garlic.
Hand-feed or offer small amounts often.
Keep fresh water in several spots, and consider a water fountain.
If your cat will not eat for more than 24 hours, call your vet. Cats who stop eating can develop serious liver problems.

Support the Eyes

Gently wipe eye discharge with a clean, damp cotton ball, one per eye, wiping away from the eye.
Do not use human eye drops unless your vet prescribes them.
Squinting, cloudiness, or a swollen eye needs a vet visit. Eye damage from herpesvirus can be permanent if untreated [4].

Reduce Stress and Keep Them Warm

Set up a quiet, warm room away from other pets and noise.
Keep the litter box, food, and water close by.
Use a soft, washable bed and change bedding often.
Stress can trigger herpesvirus flare-ups, so a calm environment matters.

What Not to Do

Do not give human cold medicine, acetaminophen, ibuprofen, aspirin, or antihistamines. Several of these are fatal to cats.
Do not give leftover antibiotics from another pet.
Do not use essential oils, especially eucalyptus, tea tree, or peppermint, near cats. They can be toxic.
Do not force food or water into the mouth. This risks choking and aspiration.

If your cat has a mouth infection with drooling or ulcers, that is often calicivirus or another problem that needs a vet. There is no reliable home remedy for cat mouth infection that replaces diagnosis and treatment. A cat in mouth pain often stops eating, which quickly becomes its own emergency.

What the Veterinarian Will Check and Test

Your vet will start with a full physical exam, including listening to the lungs and heart, checking the eyes and mouth, and feeling the abdomen and bladder.

Depending on what they find, they may recommend:

A nasal or eye swab for infectious disease testing
Blood work to check hydration, organ function, and infection markers
Chest X-rays if breathing is abnormal
A urine check or bladder ultrasound if urinary signs are present

Rapid tests for feline herpesvirus can detect the virus from nasopharyngeal secretions within about 10 minutes with good specificity [3]. Your vet may also test for calicivirus, Mycoplasma, Bordetella, and Chlamydia, since these can appear together [2].

Treatment depends on the cause. Viral infections are supported with fluids, nutrition, and sometimes antiviral medication. Bacterial infections may need antibiotics [1]. Cats with severe congestion, dehydration, or pneumonia often need hospitalization with oxygen and intravenous fluids.

If your cat also has ear problems, see How To Treat Cat Ear Infection At Home. And if you are comparing respiratory signs across species, our article on Dog Coughing: When to Call the Vet and Home Care Tips covers similar decision points.

Prevention and Monitoring

Prevention is mostly about vaccination, stress control, and early detection.

Keep core vaccines current. Feline herpesvirus and calicivirus are part of the standard feline vaccine combination.
Isolate new cats for 10 to 14 days before introducing them to resident cats.
Reduce crowding and stress in multi-cat homes.
Clean food bowls, water bowls, and litter boxes regularly.
Keep cats indoors to limit exposure to sick cats.
Watch for early signs like sneezing or watery eyes so you can start supportive care sooner.

Monitor your cat daily during a respiratory infection. Track:

How much they eat and drink
Whether they use the litter box normally
Breathing rate and effort at rest
Energy level and interest in you
Eye and nose discharge color and amount

If any of these worsen over 24 to 48 hours, call your vet. A mild cold that lingers for more than a week, or one that improves and then gets worse, needs a recheck.

Limitations and When to Contact a Veterinarian

Home care has real limits. You cannot diagnose the cause, you cannot clear a bacterial infection without the right medication, and you cannot treat pneumonia or a urinary blockage at home.

Call your veterinarian the same day if your cat:

Has not eaten for 24 hours
Is drinking very little or seems dehydrated (tacky gums, skin that tents when gently pinched)
Has thick yellow or green nasal discharge
Has a fever or feels warm to the touch
Is sneezing blood
Has eye swelling, cloudiness, or a closed eye
Seems painful around the mouth or drools

Go to an emergency clinic now if your cat:

Breathes with an open mouth or struggles to breathe
Strains to urinate with no urine or only drops
Vomits repeatedly and cannot keep water down
Collapses or cannot stand
Has pale or blue gums

Schedule a routine visit if your cat:

Has mild sneezing and clear discharge but is still eating and playful
Has chronic nasal discharge that comes and goes
Needs vaccine updates or a general checkup

Every cat is different. A young, healthy cat with a mild cold may do fine with home support, while a kitten, senior, or cat with another illness can decline quickly. Your veterinarian is the only one who can examine your cat and decide what is safe. When in doubt, call. A phone call is cheaper than an emergency.

Frequently Asked Questions

Can I give my cat human cold medicine?

No. Human cold medicines, decongestants, and pain relievers can be toxic or fatal to cats. There is no safe over-the-counter human product for feline respiratory infections. Call your vet or a pet poison control line if your cat accidentally swallows any human medication.

How long does a cat cold usually last?

Most mild viral upper respiratory infections improve within 7 to 10 days with supportive care, though some cats have lingering congestion or sneezing. If signs last longer than a week or get worse, your cat needs a recheck. Chronic nasal inflammation can follow severe viral infections and may need ongoing management [1].

Is a runny nose always a respiratory infection?

No. Nasal discharge can come from allergies, irritants, foreign objects, fungal infection, or tumors. Viral infection is the most common cause of sudden rhinitis in cats, but allergic rhinitis can be seasonal or year-round from indoor allergens like dust and mold [1]. A vet can help sort out the cause.

Can I use a humidifier or steam to help my congested cat?

Yes. Cool-mist humidifiers and short steamy bathroom sessions are safe ways to loosen nasal crusts and ease congestion. Keep the room safe, do not leave your cat unattended near hot water or essential oil diffusers, and wipe the nose gently afterward. These measures help comfort but do not treat the underlying infection.

When should I stop home care and see a vet?

Stop home care and call your vet if your cat stops eating for 24 hours, breathes with an open mouth, strains to urinate, has thick colored discharge, or seems to get worse instead of better. Kittens, seniors, and cats with other health problems should be seen sooner. Home care supports mild cases, but it cannot replace an exam when red flags appear.

References

Rhinitis and Sinusitis in Cats - Cat Owners. Merck Veterinary Manual.
EXPRESS: Detection of Mycoplasma species and respiratory pathogens in cats with rhinitis and healthy cats. Journal of feline medicine and surgery, 2026.
Rapid and sensitive detection of feline herpesvirus-1 using fluorescent microspheres as labels for immunochromatographic test strips. Veterinary research communications, 2026.
Clinical Management of Ophthalmic Manifestations of Upper Respiratory Tract Infections in Kittens. The Veterinary clinics of North America. Small animal practice, 2025.