Is My Cat's Cold an Emergency? Upper Respiratory Infection in Cats Explained

Feline upper respiratory infections (URIs) are common and usually treatable, but some signs need urgent care. Learn causes, home care, and when to see a vet immediately.

Is My Cat's Cold an Emergency? Upper Respiratory Infection in Cats Explained

Upper respiratory infections (URIs) in cats — often called "cat colds" — are common, contagious illnesses that primarily affect the nose, throat and eyes. Most are mild and resolve with supportive care, but some cats (kittens, seniors, or those with other illnesses) can become seriously ill. This guide helps you recognize symptoms, decide how urgently to seek veterinary care, and provides safe home-care measures.

Important: Never attempt to prescribe antibiotics, antivirals, or other prescription medications at home without a veterinarian’s guidance.

What is a feline upper respiratory infection (URI)?

A URI is inflammation and infection of the upper airway (nose, sinuses, throat and conjunctiva). Several infectious agents cause URIs in cats — viral causes are most common, and secondary bacterial infections can complicate the picture.

Typical signs

• Sneezing
• Nasal discharge (clear to thick and colored)
• Ocular discharge and conjunctivitis (eye redness, squinting)
• Coughing or retching
• Decreased appetite and reduced grooming
• Lethargy and fever
• Ulcerative lesions in the mouth or on the tongue (more common with calicivirus)
• Labored breathing or noisy breathing (in severe cases)

Common causes — differential diagnosis (ranked by likelihood)

(References: Merck Veterinary Manual; Cornell Feline Health Center.)

How veterinarians diagnose a URI

Your veterinarian will use a combination of:

• Physical exam (eyes, nose, mouth, lungs)
• Medical history (vaccination status, exposure to other cats, shelter intake)
• Diagnostic testing as needed: PCR swabs to identify FHV/FCV and other pathogens, bacterial culture, conjunctival swabs, bloodwork, and imaging (chest X-rays or skull CT) for severe or chronic cases.

Treatment options your vet may recommend

• Supportive care: fluids, nutritional support, warming, and nebulization/humidification
• Antibiotics: only if a bacterial infection is suspected or confirmed
• Antivirals: certain drugs (eg, famciclovir) can help severe herpesvirus infections under veterinary prescription
• Ocular treatments: topical antibiotics or antivirals for eye infections; treatment of corneal ulcers
• Hospitalization and IV fluids for dehydrated or weak cats
• Pain relief and anti-nausea drugs when needed

When to see a vet — decision support

This section helps you decide whether the situation is emergency, urgent, or wait-and-see.

• Emergency — see a vet immediately (same day or go to emergency clinic):

• Urgent — call or see your regular vet within 24 hours:

• Wait-and-see at home (contact vet if symptoms worsen):

These are general guidelines — when in doubt, call your veterinarian. Kittens, elderly cats, pregnant cats, and cats with chronic disease (FeLV, FIV) should be evaluated sooner.

When to See a Vet Immediately

If you see any of the emergency signs listed above, seek immediate veterinary care. Difficulty breathing, collapse, severe dehydration, or inability to eat are life-threatening and require urgent treatment.

Red Flags — Seek Emergency Care

• Open-mouth or very rapid breathing
• Blue, white, or very pale gums (sign of poor oxygenation)
• Seizures, collapse, or unresponsiveness
• Inability to swallow or continuous drooling (possible severe oral disease)
• Severe facial swelling, intense pain, or bleeding

(Reference: Veterinary emergency protocols; Merck Veterinary Manual.)

Home care steps you can safely try for mild cases

These measures support recovery but do not replace veterinary care when required.

Do NOT give human medications (eg, antibiotics, antihistamines, decongestants) unless directed by your veterinarian. Some human drugs are toxic to cats.

Prevention and long-term management

• Vaccination: Core vaccines reduce severity (FHV-1 and FCV vaccines). They may not prevent infection completely but usually lessen clinical signs.
• Reduce stress: Stress triggers herpesvirus flare-ups — maintain routine, environmental enrichment, and safe hiding places.
• Quarantine new or returning cats for 10–14 days before mixing with others.
• Practice good hygiene in multi-cat households and shelters.
• Regular wellness checks and testing for FeLV/FIV if risk factors exist.

Special considerations

• Kittens: higher risk of rapid dehydration and serious disease; seek veterinary care sooner.
• Chronic or recurrent signs: may indicate latent herpesvirus, chronic bacterial infection, or anatomical issues — veterinary evaluation and possibly long-term management are needed.
• Immunosuppressed cats (FeLV/FIV or on steroids): higher risk of severe disease; contact your vet promptly.

Key Takeaways

• Most feline URIs are viral and often manageable at home with supportive care, but some cats can become severely ill.
• Common causes include feline herpesvirus and calicivirus; secondary bacterial infections are possible.
• Seek immediate veterinary care for breathing difficulty, collapse, severe dehydration, high fever, or inability to eat.
• Use isolation, humidity, gentle cleaning of discharge, and appetite encouragement at home; never give prescription meds without veterinary guidance.
• Vaccination, stress reduction, and good hygiene lower risk and severity.

Sources

• Merck Veterinary Manual — "Upper respiratory infections in cats": https://www.merckvetmanual.com/respiratory-system/respiratory-diseases-of-small-animals/upper-respiratory-infections-in-cats
• Cornell Feline Health Center — "Upper respiratory infections in cats": https://www.vet.cornell.edu/departments-centers-and-institutes/cornell-feline-health-center/health-information/feline-health-topics/upper-respiratory
• Veterinary Emergency and Critical Care resources (clinical emergency signs and triage guidelines)

Frequently Asked Questions