Sinus Infection vs. COVID-19: How to Tell the Difference

A sinus infection and a COVID-19 infection can feel almost identical. Both can cause congestion, headaches, and sinus pain. Understanding the distinct differences between them can help you take proper precautions and get appropriate treatment quickly.

COVID-19 causes and symptoms

The SARS-CoV-2 virus, which causes COVID-19, primarily spreads through airborne droplets or by touching contaminated surfaces.

Symptoms of COVID-19 can range from mild to severe. Children with COVID-19 are more likely to have milder, less specific symptoms than adults. They’re less likely to experience severe breathing problems or a loss of taste or smell. In contrast, adults more often have the classic “trio”: fever, cough, and shortness of breath.

In 2026, the most common COVID-19 variants are a family called XFG and a newer strain nicknamed the “Cicada” variant (BA.3.2). Because they stay in the nose and throat, common symptoms include:

• Sore throat
• Heavy nasal congestion
• Fatigue
• Headaches
• Night sweats

Unlike older COVID-19 strains, these newer variants are less likely to involve sudden loss of taste or smell, severe shortness of breath, and digestive issues like diarrhea.

Sinus infection causes and symptoms

A sinus infection occurs when the air-filled cavities behind your nose, cheekbones, and forehead become inflamed. While allergies or bacteria can trigger this inflammation, the vast majority of cases are caused by a virus.

Sinus infections can be acute or chronic:

• Acute sinus infection: A short-term infection (lasting less than 12 weeks), often triggered by a virus, bacterium, or allergen.
• Chronic sinus infection: A persistent sinus inflammation lasting 12 weeks or longer.

Common symptoms of sinus infections:

• Facial pain or pressure around your eyes, nose, and forehead
• Nasal drainage in the back of your throat (postnasal drip)
• Thick, discolored nasal discharge
• Cough
• Toothache, especially in the upper teeth
• Temporary loss of smell or taste, usually caused by congestion
• Stuffy or runny nose
• Sore throat

How can I tell if I have COVID-19 or a sinus infection?

Modern COVID-19 strains cause the same nasal congestion, sore throat, and headaches as sinus infections, which is why the two are so hard to tell apart.

Symptoms pointing toward a sinus infection:

• Facial swelling: This is a standard sign of sinus pressure, but it is not a recognized symptom of COVID-19.
• Upper tooth pain: The pressure from a sinus infection can press on the dental nerves and cause a dull toothache.

Symptoms pointing toward COVID-19:

• Full-body symptoms: A sudden onset of high fever, profound fatigue, full-body muscle aches, and chills are more common with COVID-19.
• Night sweats: It's rare to experience night sweats with a sinus infection, but quite common with modern variants of COVID-19.

Because it is so hard to tell the difference based on symptoms alone, taking a COVID-19 test is the only way to know what you have.

How are sinus infections and COVID-19 diagnosed?

If you are unsure what is causing your illness, a healthcare provider can evaluate your symptoms or order tests to help you get the right treatment.

Diagnosing a sinus infection

Sinus infections are usually diagnosed through clinical evaluation rather than a single test. Your provider will review your medical history and examine you for:

• A blocked nose or sinuses
• Pain or pressure in your face
• A reduced sense of taste and smell
• Toothache
• Colored nasal discharge

For an especially severe or long-lasting sinus infection, your provider may recommend imaging, like CT or MRI scans, or additional tests like a nasal endoscopy.

Diagnosing COVID-19

COVID-19 cannot be diagnosed based on symptoms alone. The only sure way to know if you have COVID-19 is to take a test.

• Rapid antigen tests: These are done at home or at testing centers via a nose or throat swab, giving you results within 15 minutes. They are very useful but can sometimes miss early infections.
• PCR tests: This is the highly accurate gold standard for detecting COVID-19. PCR tests can detect even small amounts of the virus and will give you a clear answer if you are unsure about your rapid test results.

Sinus infection treatment options

How you treat a sinus infection depends on its cause. Viral sinus infections usually resolve on their own in a week. Bacterial or chronic sinus infections may require prescription medications like antibiotics. If your infection is caused by allergies, your provider may recommend an antihistamine spray or tablet.

Regardless of the cause, over-the-counter treatments and self-care strategies are highly effective at managing your day-to-day symptoms.

Over-the-counter medication

While these medications do not cure underlying infections, they can ease your symptoms:

• Saline nasal spray: Non-medicated sodium chloride sprays can cleanse and rinse your nasal passages.
• Steroid nasal sprays: Sprays containing fluticasone (like Flonase) can reduce sinus inflammation.
• Decongestants: Decongestant medications containing pseudoephedrine (like Sudafed) are available as sprays, oral liquids, and tablets. Use them only for a few days, as prolonged use can worsen your congestion.
• Over-the-counter pain relievers: Pain relievers like ibuprofen and acetaminophen can ease sinus pain and fever.

Self-care

These simple home remedies help soothe irritated tissues and encourage your sinuses to drain naturally:

• Hydration: Drink plenty of water to thin mucus and ease congestion.
• Steam inhalation: Inhale steam from a hot shower or bowl to relieve nasal congestion and sinus irritation.
• Warm compress: Apply a warm, damp cloth over your sinuses to reduce facial pressure.
• Elevate your head: Sleep with your head elevated to encourage sinus drainage.
• Humidify the air: Use a humidifier to moisten your dry nasal passages.

These strategies may not replace the need for medical treatment. You should consult a healthcare provider if your condition persists or even worsens.

COVID-19 treatment options

For many people, mild COVID-19 resolves after a week or so. The CDC recommends staying home and away from others if you test positive for COVID-19. Stay home until your symptoms are improving overall and you have been fever-free for at least 24 hours without using fever-reducing medication.

Self-care and over the counter medications

To relieve mild symptoms at home, focus on getting plenty of rest, staying hydrated, and managing discomfort with over-the-counter options:

• Fever reducers: Over-the-counter medications like acetaminophen or ibuprofen can help reduce fever and discomfort. Take them as instructed on the package.
• Cough suppressants: Over-the-counter cough medications may help relieve cough symptoms.

Prescription antiviral medication

Your healthcare provider may prescribe medication if you test positive for COVID-19, especially if you are at high risk for hospitalization or severe complications:

• Nirmatrelvir/ritonavir (Paxlovid): Available as oral tablets, taken at home. This combination is approved for adults and authorized for emergency use in children ages 12 and older who weigh at least 88 pounds (40 kg).
• Molnupiravir (Lagevrio): Available as oral capsules, taken at home. This medication is authorized for adults at high risk for severe illness when other FDA-approved treatment options are not accessible or clinically appropriate.
• Remdesivir (Veklury): FDA-approved for adults and children, administered through an IV in a healthcare setting.

The latest CDC-recommended 2025–2026 vaccines are available for adults and children ages 6 months or older. If you have already been immunized, find more official guidance on the 2025–2026 vaccine here.

Can COVID-19 lead to a sinus infection, or vice versa?

COVID-19 and sinus infections are distinct diseases caused by different factors. One does not directly turn into the other.

However, they can happen at the same time. Sinus inflammation might even slightly worsen COVID-19 symptoms like headaches. Only proper testing can tell them apart for sure.

Tips to prevent getting COVID-19 or a sinus infection

These tips can help reduce your chances of getting a sinus infection or COVID-19:

• Wash your hands often: Use soap and water or alcohol-based sanitizer.
• Avoid close contact: Stay away from crowds and sick people, and stay home if you feel unwell yourself.
• Stay vaccinated: Keep up with COVID-19 vaccinations, especially during flu season.
• Wear a mask: Use a well-fitting mask to block virus-carrying particles in crowded spaces.

Frequently asked questions

What are the current symptoms of COVID-19?

COVID-19 symptoms can change slightly as new versions of the virus spread. Currently, the most common strains usually feel like a bad cold or flu. Most people experience a severe sore throat, heavy stuffy nose, fatigue, headaches, and a fever.

What’s the main difference between a sinus infection and COVID-19?

While both conditions cause heavy nasal congestion, the primary difference lies in how they affect the rest of your body. A sinus infection is usually localized to your face, causing facial swelling, sinus pressure, and upper tooth pain. COVID-19, however, is much more likely to trigger full-body symptoms, like muscle aches, high fever, fatigue, and night sweats.

How Sesame can help with sinus infection or COVID-19 treatment

If you’re concerned about your symptoms or looking for more information, Sesame offers same-day, affordable online COVID-19 visits and sinus infection treatment. Talk to a provider on Sesame to get medical advice and prescription medication if it’s appropriate.