Sinus Infections in Cats: Symptoms, Causes, Treatment, and Recovery

If your cat has a runny nose, frequent sneezing, noisy breathing, or congestion that doesn't seem to improve, they may have a sinus infection. Sinus infections in cats are often linked to upper respiratory infections caused by viruses or bacteria, although allergies, dental disease, fungal infections, and nasal polyps can also play a role. Mild cases may improve with supportive home care, but persistent or severe symptoms require veterinary treatment to identify and address the underlying cause.

Key Takeaways

• A sinus infection occurs when the tissues lining your cat's nasal passages and sinuses become inflamed, often due to an infection.

• Common signs include sneezing, nasal discharge, congestion, noisy breathing, watery eyes, and a reduced appetite.

• Viral upper respiratory infections are the most common cause, but bacteria, dental disease, fungal infections, and nasal polyps can also lead to sinus inflammation.

• Treatment depends on the underlying cause and may include antibiotics, antiviral medications, supportive care, or other therapies.

• Keeping your cat hydrated, encouraging them to eat, and increasing humidity can help improve comfort during recovery.

• Cats with difficulty breathing, facial swelling, persistent symptoms, or a loss of appetite should be evaluated by a veterinarian promptly.

What Is a Sinus Infection in Cats?

A sinus infection, also called sinusitis, is inflammation of the air-filled spaces (sinuses) surrounding your cat's nasal passages. In many cases, sinusitis develops alongside rhinitis, which is inflammation of the nasal cavity itself. Because these conditions commonly occur together, veterinarians often refer to them collectively as rhinosinusitis.

Healthy sinuses help warm, filter, and humidify the air your cat breathes. When inflammation develops, the normally thin lining of the nasal passages begins producing excess mucus. Swelling narrows the airways, trapping mucus and making it more difficult for your cat to breathe comfortably through their nose.

Cats rely heavily on their sense of smell. Unlike people, they use scent not only to explore their surroundings but also to recognize food and communicate with other animals. Even mild nasal congestion can reduce their appetite because food becomes much less aromatic.

Acute vs. Chronic Sinus Infections

Not all sinus infections are the same.

Acute sinus infections develop suddenly and often occur after a viral upper respiratory infection. Many cats recover within one to three weeks with appropriate supportive care and, when necessary, veterinary treatment.

Chronic sinusitis develops when inflammation persists for weeks or months. Chronic cases may result from repeated viral infections, dental disease, fungal infections, nasal polyps, structural abnormalities, or other underlying conditions. These cats often experience recurring congestion and may require more extensive diagnostics and long-term management.

Understanding whether your cat has an acute or chronic condition helps your veterinarian determine the most appropriate treatment plan.

Symptoms of Sinus Infection in Cats

The signs of a sinus infection can range from mild nasal congestion to significant breathing difficulty, depending on the cause and severity of the inflammation.

Some cats continue acting normally despite having a runny nose, while others become noticeably lethargic, lose their appetite, or withdraw from normal activities.

Common symptoms include:

Symptom	What You May Notice
Sneezing	Frequent or repeated sneezing episodes, sometimes occurring in clusters.
Nasal discharge	Clear, white, yellow, or green mucus from one or both nostrils.
Nasal congestion	Stuffy breathing, snoring sounds, or difficulty breathing through the nose.
Noisy breathing	Snorting, wheezing, or audible congestion while resting.
Watery or irritated eyes	Excessive tearing or eye discharge often accompanies upper respiratory infections.
Reduced appetite	Cats may refuse food because congestion limits their ability to smell it.
Lethargy	Sleeping more than usual or showing less interest in normal activities.
Bad breath	May occur if dental disease contributes to the infection.
Pawing at the face	Your cat may rub or paw at their nose because of discomfort.
Facial swelling	Can indicate dental disease, severe infection, or other serious conditions requiring prompt evaluation.

The color of the nasal discharge may also provide clues, although it cannot confirm the exact cause.

• Clear discharge is commonly associated with early viral infections or mild irritation.

• White, yellow, or green discharge may indicate inflammation or a secondary bacterial infection.

• Bloody discharge can occur with trauma, foreign objects, fungal disease, nasal tumors, or severe inflammation and should always be evaluated by a veterinarian.

Can a Sinus Infection Affect Your Cat's Appetite?

Yes. One of the earliest signs many owners notice is that their cat suddenly becomes less interested in food.

Cats depend heavily on their sense of smell to stimulate their appetite. When swollen nasal passages block airflow, food loses much of its aroma, making even favorite meals less appealing.

This reduced appetite isn't always caused by nausea. Instead, many congested cats simply can't smell their food well enough to recognize it.

If your cat refuses food for more than 24 hours, contact your veterinarian. Cats that go too long without eating are at risk of developing hepatic lipidosis (fatty liver disease), a serious condition that requires prompt medical treatment.

Symptoms That Require Immediate Veterinary Care

While many mild upper respiratory infections improve with treatment and supportive care, some symptoms suggest a more serious condition.

Seek veterinary care promptly if your cat develops any of the following:

Symptom	Why It Needs Immediate Attention
Open-mouth breathing	Cats rarely breathe through their mouths unless they are in significant respiratory distress.
Difficulty breathing	Labored or rapid breathing may indicate severe airway obstruction or pneumonia.
Refusing food for more than 24 hours	Prolonged fasting increases the risk of hepatic lipidosis.
Persistent bloody nasal discharge	May indicate trauma, fungal disease, foreign material, or a nasal tumor.
Facial swelling	Can signal a dental abscess, severe infection, or other serious condition.
High fever or profound lethargy	May indicate a systemic infection requiring treatment.
Symptoms lasting longer than 10–14 days	Persistent congestion often requires additional diagnostics to identify the underlying cause.

Early veterinary care often leads to faster recovery and helps prevent minor infections from progressing into more serious respiratory disease.

Sinus Infection vs. Upper Respiratory Infection in Cats: What's the Difference?

Condition	Upper Respiratory Infection	Sinus Infection
What it affects	Nose, throat, eyes	Sinuses and nasal passages
Common cause	Usually viral	Viral, bacterial, dental disease, fungi, polyps
Sneezing	✓	✓
Nasal congestion	✓	✓✓
Facial pain/swelling	Rare	More common
Chronic symptoms	Sometimes	More likely
Typical treatment	Supportive care ± medications	Depends on underlying cause

Causes of Sinus Infections in Cats

Sinus infections are often thought of as a single illness, but they're actually a symptom of an underlying problem. While viruses are the most common trigger, bacteria, dental disease, fungal infections, and even growths inside the nasal passages can all lead to inflammation of the sinuses.

Identifying the cause is one of the most important parts of treatment because the right therapy for one cat may be completely different for another.

Viral Upper Respiratory Infections

The majority of sinus infections in cats begin with a viral upper respiratory infection (URI).

Two viruses account for most cases:

• Feline herpesvirus type-1 (FHV-1)
• Feline calicivirus (FCV)

These highly contagious viruses spread through saliva, nasal secretions, eye discharge, shared food bowls, grooming, and close contact with infected cats.

After infection, inflammation develops within the nasal passages and sinuses, causing congestion, sneezing, and nasal discharge.

Feline herpesvirus deserves special attention because it remains in the body for life. Even after a cat appears to recover, the virus can become dormant and reactivate during periods of stress, illness, surgery, or immune suppression. As a result, some cats experience recurring episodes of sneezing and congestion throughout their lives.

Secondary Bacterial Infections

Viruses often damage the protective lining of the nasal passages, creating an opportunity for bacteria to multiply.

When this happens, a secondary bacterial infection may develop, leading to thicker nasal discharge and more severe inflammation.

Cats with bacterial sinus infections may have:

• Yellow or green nasal discharge
• Worsening congestion
• Fever
• Reduced appetite
• Increased lethargy

Your veterinarian may prescribe antibiotics if they suspect a bacterial infection is contributing to your cat's symptoms.

Dental Disease

Many cat owners are surprised to learn that dental disease is a common cause of chronic sinus infections.

The roots of the upper canine teeth and premolars sit close to the nasal cavity. Severe tooth infections, abscesses, or advanced periodontal disease can spread into the surrounding tissues, leading to persistent nasal inflammation.

Dental-related sinus infections are often associated with:

• Bad breath
• Difficulty eating
• Facial swelling
• Pain while chewing
• Nasal discharge, sometimes from only one nostril

Treating the infected tooth is usually necessary before the sinus infection will fully resolve.

Allergies and Environmental Irritants

Although allergies are less common in cats than in people, they can still contribute to chronic nasal inflammation.

Potential irritants include:

• Cigarette smoke
• Dust
• Mold
• Pollen
• Strong perfumes
• Aerosol sprays
• Scented candles
• Household cleaning products
• Scented cat litter

Continued exposure may keep the nasal passages inflamed, making cats more susceptible to secondary infections.

Reducing environmental irritants is often an important part of long-term management.

Fungal Infections

Certain fungal organisms can infect the nasal cavity and surrounding tissues.

Although fungal sinus infections are relatively uncommon, they tend to be more serious and often require specialized testing and prolonged antifungal treatment.

Cats with fungal infections may develop:

• Chronic nasal discharge
• Nosebleeds
• Facial swelling
• Sneezing that doesn't improve
• Weight loss
• Decreased appetite

Advanced imaging and tissue sampling are often needed to confirm the diagnosis.

Nasal Polyps

Inflammatory polyps are benign growths that develop inside the nasal passages, middle ear, or upper throat.

As they enlarge, they can partially block airflow and interfere with normal mucus drainage, creating an environment where infections are more likely to occur.

Cats with nasal polyps may experience:

• Chronic congestion
• Loud breathing
• Persistent sneezing
• Nasal discharge
• Head shaking if the ears are also involved

Surgical removal is often recommended for symptomatic polyps.

Foreign Objects

Occasionally, a blade of grass, plant material, or another small object becomes lodged inside the nasal cavity.

Foreign bodies typically cause sudden symptoms, including:

• Violent sneezing
• Pawing at the face
• Nasal discharge from one nostril
• Bloody discharge

Removing the object usually resolves the inflammation.

Nasal Tumors

Although less common than viral infections, tumors affecting the nasal cavity become more likely as cats age.

Cancerous growths can interfere with airflow, damage surrounding tissues, and cause chronic inflammation.

Signs may include:

• Persistent one-sided nasal discharge
• Nosebleeds
• Facial deformity
• Weight loss
• Progressive breathing difficulty

Advanced imaging and biopsy are usually required for diagnosis.

Risk Factors for Sinus Infections in Cats

While any cat can develop a sinus infection, certain factors increase the likelihood.

These include:

• Living in multi-cat households
• Spending time in shelters or boarding facilities
• Chronic stress
• Poor nutrition
• Dental disease
• Incomplete vaccination
• Advanced age
• Immune suppression from illness or medications

Young kittens are particularly susceptible because their immune systems are still developing, while senior cats may be more likely to develop chronic disease, dental infections, or nasal tumors.

Understanding these risk factors allows owners to reduce exposure whenever possible and recognize symptoms earlier.

How Veterinarians Diagnose Sinus Infections in Cats

Because many different conditions can produce similar symptoms, your veterinarian will focus on identifying the underlying cause rather than simply confirming that your cat has a sinus infection.

Diagnosis usually begins with a complete physical examination and a detailed medical history. Your veterinarian will ask questions about how long your cat has been sneezing, the appearance of the nasal discharge, appetite changes, exposure to other cats, vaccination history, and whether the symptoms have occurred before.

Physical Examination

Your veterinarian will examine your cat's:

• Nose and nostrils
• Eyes
• Mouth and teeth
• Lymph nodes
• Breathing pattern
• Body temperature

They'll also listen to your cat's lungs to determine whether the infection appears limited to the upper airways or has progressed deeper into the respiratory tract.

Blood Work

Routine blood tests help evaluate your cat's overall health while looking for signs of inflammation, infection, dehydration, or other medical conditions that may be contributing to their illness.

Blood work also helps determine whether sedation or anesthesia is safe if additional procedures become necessary.

Nasal Swabs and Cultures

In cats with chronic or recurrent infections, your veterinarian may collect samples from the nasal passages.

Laboratory testing can help identify bacterial or fungal organisms while determining which medications are most likely to be effective.

Because many bacterial infections develop secondary to viral disease, cultures are generally reserved for cases that fail to improve with initial treatment or repeatedly return.

Diagnostic Imaging

If symptoms persist, imaging studies may be recommended to examine structures hidden beneath the surface.

Depending on your cat's condition, this may include:

• Dental radiographs
• Skull radiographs
• Computed tomography (CT)
• Magnetic resonance imaging (MRI)

These studies can identify:

• Dental abscesses
• Nasal polyps
• Foreign objects
• Thickened sinus tissue
• Fungal disease
• Tumors
• Structural abnormalities

CT imaging has become one of the most valuable tools for evaluating chronic nasal disease because it provides detailed images of the nasal cavity and surrounding bones.

Rhinoscopy

Rhinoscopy allows a veterinarian to examine the inside of the nasal passages using a small flexible camera while your cat is under anesthesia.

This procedure may reveal:

• Polyps
• Foreign material
• Areas of chronic inflammation
• Fungal plaques
• Tumors

Biopsies can often be collected during the same procedure, helping confirm the diagnosis without additional surgery.

Biopsy

If imaging reveals abnormal tissue, your veterinarian may recommend collecting a biopsy.

Examining tissue under a microscope allows veterinary pathologists to distinguish between chronic inflammation, fungal infections, benign growths, and cancer.

Although hearing that additional testing is needed can feel stressful, identifying the underlying cause is the key to developing the most effective treatment plan.

Treatment of Sinus Infections in Cats

The best treatment for a sinus infection depends on what's causing it. While many mild upper respiratory infections improve with supportive care, bacterial infections, dental disease, nasal polyps, fungal infections, and tumors each require different treatment approaches.

The primary goal is to treat the underlying cause while relieving congestion, reducing inflammation, and helping your cat breathe, eat, and recover comfortably.

Antibiotics for Bacterial Infections

Antibiotics are commonly prescribed when a veterinarian suspects a bacterial infection is contributing to your cat's sinus disease.

It's important to understand that antibiotics do not treat viral infections. Instead, they target secondary bacterial infections that often develop after viruses damage the lining of the nasal passages.

If antibiotics are prescribed:

• Give every dose exactly as directed.
• Complete the full course, even if your cat seems better.
• Contact your veterinarian if symptoms worsen or fail to improve.

Stopping antibiotics too early may allow the infection to return and contribute to antibiotic resistance.

Antiviral Medications

Most feline upper respiratory infections are caused by viruses, particularly feline herpesvirus.

While many viral infections improve with supportive care alone, some cats with severe or recurring herpesvirus infections may benefit from antiviral medications prescribed by a veterinarian.

Because feline herpesvirus remains dormant within the body after infection, treatment focuses on controlling flare-ups rather than eliminating the virus completely.

Reducing stress and supporting overall health often plays an important role in minimizing future recurrences.

Anti-Inflammatory and Supportive Medications

Inflammation inside the nasal passages causes much of the congestion associated with sinus infections.

Depending on your cat's condition, your veterinarian may prescribe medications to help relieve inflammation, improve comfort, or stimulate appetite.

These may include:

• Anti-inflammatory medications
• Pain relief when appropriate
• Appetite stimulants
• Fluid therapy for dehydration
• Eye medications if conjunctivitis is also present

Never give your cat human cold medicines, decongestants, or over-the-counter pain relievers. Many common human medications are toxic to cats.

Treating Dental Disease

When a tooth root abscess or advanced periodontal disease causes chronic sinus inflammation, treating the infection inside the mouth becomes essential.

This may involve:

• Professional dental cleaning
• Tooth extraction
• Antibiotics
• Pain management

Many cats experience significant improvement in their nasal symptoms once the infected tooth has been treated.

Surgery for Nasal Polyps or Tumors

If imaging or rhinoscopy identifies a physical obstruction inside the nasal passages, surgery may be recommended.

Procedures vary depending on the underlying condition but may include:

• Removal of inflammatory polyps
• Extraction of foreign material
• Biopsy of abnormal tissue
• Surgery for selected tumors

Some cats recover completely after polyp removal, while others require ongoing monitoring if recurrence occurs.

Treatment for Fungal Infections

Fungal infections usually require specialized antifungal medications that may be given orally, topically, or directly into the nasal cavity depending on the organism involved.

Because fungal disease can be challenging to eliminate, treatment often continues for several weeks or months, with follow-up examinations used to monitor progress.

Home Supportive Care for Cats With Sinus Infections

Whether your cat has a viral upper respiratory infection or is recovering from veterinary treatment, supportive home care can help them stay comfortable and encourage healing.

Home care should never replace veterinary treatment when symptoms are severe, but it often plays an important role in recovery.

Keep Your Cat Hydrated

Adequate hydration helps thin mucus, making it easier for your cat to clear congested nasal passages.

Encourage drinking by:

• Providing fresh water daily.
• Offering multiple water bowls.
• Using a cat water fountain if your cat prefers running water.
• Feeding canned food to increase moisture intake.

If your cat becomes dehydrated or refuses water, veterinary treatment may be necessary.

Increase Humidity

Dry air can make congestion worse by allowing mucus to become thicker and more difficult to clear.

Running a cool-mist humidifier near your cat's resting area or allowing them to spend 10 to 15 minutes in a steamy bathroom while a hot shower runs can temporarily increase humidity and improve comfort.

Avoid exposing your cat directly to hot steam or essential oils, which may irritate the respiratory tract.

Encourage Your Cat to Eat

Cats rely heavily on their sense of smell when deciding whether to eat.

Congestion often reduces appetite because food simply doesn't smell as appealing.

You can encourage eating by:

• Warming canned food slightly.
• Offering strong-smelling, veterinarian-approved foods.
• Feeding small meals throughout the day.
• Minimizing stress during mealtime.

If your cat refuses food for more than 24 hours, contact your veterinarian immediately.

Gently Clean Nasal Discharge

Dried mucus can block airflow and make breathing more difficult.

Use a soft cloth or cotton pad dampened with warm water to gently wipe away nasal discharge several times each day.

Avoid inserting cotton swabs or other objects into your cat's nostrils.

Reduce Environmental Irritants

Irritated nasal tissues heal more effectively when exposure to airborne irritants is minimized.

Whenever possible, reduce your cat's exposure to:

• Cigarette smoke
• Vaping products
• Aerosol sprays
• Strong perfumes
• Scented candles
• Harsh cleaning products
• Dust
• Scented cat litter

Maintaining good indoor air quality may reduce irritation while supporting recovery.

Help Reduce Stress

Stress affects the immune system and is a well-recognized trigger for feline herpesvirus flare-ups.

Providing a calm environment can support recovery while reducing the likelihood of recurring respiratory symptoms.

Simple ways to reduce stress include:

• Maintaining a consistent daily routine.
• Providing quiet resting areas.
• Limiting unnecessary handling.
• Keeping food, water, and litter boxes easily accessible.
• Using environmental enrichment such as scratching posts and hiding spaces.

Can Natural Supplements Help Support Recovery?

Natural supplements cannot cure a sinus infection, but some may help support your cat's immune system, reduce inflammation, and promote overall wellness while they recover.

When used alongside veterinary care, these supplements may become part of a comprehensive health plan for cats with recurrent upper respiratory infections.

Immune Support Supplements

A healthy immune system plays an important role in helping cats respond to viral and bacterial infections.

Veterinarian-formulated immune support supplements often contain ingredients that support normal immune function without replacing prescription medications.

These products may be especially beneficial for cats prone to recurring upper respiratory infections.

Probiotics

The digestive and immune systems are closely connected.

Probiotics help maintain a healthy balance of beneficial bacteria within the gastrointestinal tract, which supports normal immune function and overall health.

Although probiotics do not directly treat sinus infections, maintaining a healthy gut microbiome may help support recovery and resilience during periods of illness.

Omega-3 Fatty Acids

Omega-3 fatty acids provide anti-inflammatory support throughout the body.

By supporting a healthy inflammatory response, they may complement other treatments prescribed by your veterinarian while promoting overall wellness.

Fish oil supplements formulated specifically for cats are generally preferred to human products because they provide appropriate concentrations and dosing guidance.

CBD for Cats

CBD continues to be studied for its potential role in supporting stress, discomfort, and overall wellness in companion animals.

While current research does not show that CBD treats sinus infections themselves, reducing stress may be beneficial for cats with recurrent feline herpesvirus infections because stress is one of the most common triggers for viral flare-ups.

High-quality CBD products formulated specifically for cats may also support normal inflammatory responses and general well-being as part of a veterinarian-guided wellness plan.

More clinical studies are needed to better understand CBD's role in feline respiratory health.

Why Identifying the Underlying Cause Matters

One of the biggest misconceptions about sinus infections is that all cases should be treated the same way.

In reality, similar symptoms can have very different causes.

A cat with feline herpesvirus requires a different treatment plan than a cat with a tooth root abscess. Likewise, fungal infections, nasal polyps, allergies, and nasal tumors each require specific therapies that supportive care alone cannot provide.

The goal isn't simply to stop sneezing or reduce nasal discharge.

The goal is to identify and treat the condition responsible for the inflammation while supporting your cat's comfort and overall health throughout recovery.

Recovery and Management of Sinus Infections in Cats

Most cats with uncomplicated sinus infections begin to improve within one to two weeks when they receive appropriate treatment and supportive care. However, recovery time varies depending on the underlying cause, your cat's overall health, and whether the condition is acute or chronic.

Cats with viral upper respiratory infections often recover with rest, hydration, proper nutrition, and veterinary monitoring. Others, particularly those with feline herpesvirus, may continue to experience occasional flare-ups throughout their lives.

For cats with chronic sinusitis, the goal is often long-term management rather than a permanent cure. Identifying and controlling the underlying cause can reduce the frequency and severity of future episodes while improving your cat's quality of life.

What to Expect During Recovery

As your cat begins to recover, you should gradually notice:

• Less frequent sneezing
• Reduced nasal discharge
• Easier breathing through the nose
• Improved appetite
• Higher energy levels
• A return to normal grooming and daily activities

Complete your veterinarian's recommended treatment plan even if your cat appears to feel better after a few days. Stopping medications early may allow the infection to return or worsen.

Caring for a Cat Recovering From a Sinus Infection

Supporting your cat at home can make recovery more comfortable and may help prevent complications.

Continue to:

• Encourage eating by offering warm, aromatic food.
• Provide plenty of fresh water.
• Keep the nasal area clean.
• Reduce stress whenever possible.
• Limit exposure to cigarette smoke, dust, and strong fragrances.
• Administer medications exactly as prescribed.
• Attend all recommended follow-up appointments.

If symptoms return after treatment, contact your veterinarian rather than restarting old medications on your own.

Can Sinus Infections Become Chronic?

Yes. Some cats develop chronic rhinosinusitis, especially after repeated viral infections or when an underlying condition continues causing inflammation.

Chronic sinus disease may involve:

• Ongoing sneezing
• Intermittent nasal discharge
• Periodic congestion
• Recurrent bacterial infections
• Reduced sense of smell

Although chronic sinusitis cannot always be cured, many cats continue to live happy, comfortable lives with ongoing veterinary care and appropriate management.

Prevention of Sinus Infections in Cats

Not every sinus infection can be prevented, but there are several ways to reduce your cat's risk of developing respiratory disease.

Keep Vaccinations Current

Core vaccinations help reduce the severity of several common viral respiratory infections, including feline herpesvirus and feline calicivirus.

While vaccines do not always prevent infection completely, they often reduce the severity and duration of illness.

Your veterinarian can recommend the most appropriate vaccination schedule based on your cat's age, lifestyle, and risk factors.

Reduce Exposure to Sick Cats

Respiratory infections spread easily between cats through close contact and contaminated objects.

If you have multiple cats:

• Separate sick cats whenever possible.
• Wash food and water bowls regularly.
• Clean litter boxes frequently.
• Wash your hands after handling an ill cat.
• Avoid sharing bedding until your sick cat has recovered.

These simple precautions help reduce transmission throughout the household.

Maintain Good Dental Health

Routine dental care protects far more than your cat's teeth.

Professional dental cleanings, regular oral examinations, and early treatment of dental disease can reduce the risk of infections spreading into the nasal cavity and sinuses.

Feed a Complete and Balanced Diet

Proper nutrition supports immune function and overall health.

Choose a nutritionally complete diet appropriate for your cat's age and life stage, and ensure they maintain a healthy body weight.

Well-nourished cats are generally better equipped to recover from illness than those with underlying nutritional deficiencies.

Reduce Stress

Stress is one of the most common triggers for recurrent feline herpesvirus infections.

Creating a predictable, enriching environment may reduce future flare-ups.

Helpful strategies include:

• Maintaining consistent feeding schedules.
• Providing hiding places and elevated resting areas.
• Minimizing sudden environmental changes.
• Introducing new pets gradually.
• Ensuring each cat has adequate food bowls, litter boxes, and resting spaces.

Schedule Routine Veterinary Checkups

Regular wellness examinations allow your veterinarian to detect dental disease, chronic respiratory problems, and other medical conditions before they become more serious.

Senior cats, cats with chronic illnesses, and cats with recurring respiratory infections often benefit from more frequent monitoring.

Sinus Infections in Cats FAQs

Is there a home treatment for a sinus infection in cats?

Supportive home care can help keep your cat comfortable while they recover, but it does not replace veterinary treatment when an underlying infection or disease is present.

Helpful home care measures include:

• Providing fresh water and encouraging hydration.
• Using a cool-mist humidifier.
• Offering warm, aromatic wet food.
• Gently cleaning nasal discharge with a warm, damp cloth.
• Keeping your cat indoors in a quiet, low-stress environment.
• Reducing exposure to smoke, dust, and other respiratory irritants.

If your cat develops difficulty breathing, stops eating, or symptoms persist for more than 10 to 14 days, they should be examined by a veterinarian.

Is nasal dripping a sign of a sinus infection in cats?

Yes. Nasal discharge is one of the most common signs of sinus infections and upper respiratory disease.

The discharge may be:

• Clear
• White
• Yellow
• Green
• Blood-tinged

Although nasal discharge often accompanies viral infections, it can also occur with bacterial infections, allergies, dental disease, fungal infections, foreign objects, or nasal tumors.

Persistent or one-sided nasal discharge should always be evaluated by a veterinarian.

Can a sinus infection go away on its own?

Some mild viral upper respiratory infections improve with time and supportive care, but not every sinus infection resolves without treatment.

Secondary bacterial infections, dental disease, fungal infections, nasal polyps, and tumors generally require veterinary diagnosis and treatment.

If symptoms worsen or fail to improve after several days, schedule a veterinary examination.

How long does a sinus infection last in cats?

Most uncomplicated viral respiratory infections improve within one to three weeks.

Chronic sinusitis, however, may require ongoing management depending on the underlying cause.

Recovery is often faster when treatment begins early.

Are sinus infections contagious between cats?

Many of the viruses and bacteria that cause sinus infections are contagious.

Cats can spread respiratory pathogens through saliva, nasal discharge, eye secretions, grooming, shared food bowls, and close contact.

If one cat in your household becomes ill, limiting contact with healthy cats and practicing good hygiene can help reduce transmission.

Can allergies cause sinus infections in cats?

Allergies themselves do not usually cause bacterial sinus infections, but they can contribute to chronic inflammation within the nasal passages.

Inflamed tissue may become more susceptible to secondary infections over time.

Can I give my cat human cold medicine?

No.

Human cold medications, decongestants, nasal sprays, and pain relievers can be extremely dangerous for cats.

Only give medications that have been prescribed or approved by your veterinarian.

The Bottom Line

Sinus infections in cats are a common cause of sneezing, nasal discharge, congestion, and reduced appetite. While many cases begin as viral upper respiratory infections, bacterial infections, dental disease, fungal infections, nasal polyps, and other conditions can produce similar symptoms.

Because treatment depends on identifying the underlying cause, persistent or severe respiratory signs should always be evaluated by a veterinarian.

Alongside professional veterinary care, supportive home care—including hydration, good nutrition, increased humidity, stress reduction, and appropriate natural supplements—can help many cats recover more comfortably while supporting their overall immune health.

The sooner a sinus infection is diagnosed and treated, the better the chance of preventing complications and helping your cat return to feeling their best.

References

American Association of Feline Practitioners (AAFP). Feline Upper Respiratory Tract Disease Guidelines.

International Society of Feline Medicine (ISFM). Guidelines for the Management of Feline Respiratory Disease.

Merck Veterinary Manual. Upper Respiratory Diseases of Cats.

Cornell Feline Health Center. Feline Upper Respiratory Infection.

American Veterinary Medical Association (AVMA). Keeping Cats Healthy.

Sykes JE. Canine and Feline Infectious Diseases. 2nd Edition. Elsevier.

Lappin MR. Feline Upper Respiratory Disease. Veterinary Clinics of North America: Small Animal Practice.